Optics and Laser Technology最新文献_第6页

Ultra long distance Phase-sensitive OTDR using SOVMD method

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-06 DOI: 10.1016/j.optlastec.2025.112709

Yu Wang , Waner Du , Junhong Wang , Weidong Bai , Qing Bai , Xin Liu , Baoquan Jin

In order to enhance the sensing distance of phase-sensitive optical time-domain reflectometer (Φ-OTDR), a hybrid optical amplification structure is proposed, which combines backward Brillouin amplification, bi-directional Raman amplification, and relay erbium-doped fiber (EDF) amplification. Unconsumed Raman pump light is used for the relay EDF amplification, and partial intrinsic light is modulated as Brillouin pump light. Due to the large amount of background noise imported by the hybrid optical amplification, a sparrow optimization variational mode decomposition (SOVMD) algorithm is designed to demodulate the vibration phase. The sparrow optimization processing aims to optimize the decomposition parameters corresponding to different sample entropy values of amplification stages. Experimental results show that a sensing distance up to 211.90 km is achieved without any relay power supply. Multi-points vibration signals are localized at 171.34 km and 211.75 km, with a positioning signal-to-noise ratio of above 11 dB. Different vibration signals are decomposed and recovered through the SOVMD algorithm. The SOVMD algorithm has a significant effect on the recovery of low-frequency vibration signals, and it can recover the vibration frequency as low as 0.01 Hz. Therefore, this system can provide a reference for ultra-long-distance detection.

{"title":"Ultra long distance Phase-sensitive OTDR using SOVMD method","authors":"Yu Wang , Waner Du , Junhong Wang , Weidong Bai , Qing Bai , Xin Liu , Baoquan Jin","doi":"10.1016/j.optlastec.2025.112709","DOIUrl":"10.1016/j.optlastec.2025.112709","url":null,"abstract":"<div><div>In order to enhance the sensing distance of phase-sensitive optical time-domain reflectometer (Φ-OTDR), a hybrid optical amplification structure is proposed, which combines backward Brillouin amplification, bi-directional Raman amplification, and relay erbium-doped fiber (EDF) amplification. Unconsumed Raman pump light is used for the relay EDF amplification, and partial intrinsic light is modulated as Brillouin pump light. Due to the large amount of background noise imported by the hybrid optical amplification, a sparrow optimization variational mode decomposition (SOVMD) algorithm is designed to demodulate the vibration phase. The sparrow optimization processing aims to optimize the decomposition parameters corresponding to different sample entropy values of amplification stages. Experimental results show that a sensing distance up to 211.90 km is achieved without any relay power supply. Multi-points vibration signals are localized at 171.34 km and 211.75 km, with a positioning signal-to-noise ratio of above 11 dB. Different vibration signals are decomposed and recovered through the SOVMD algorithm. The SOVMD algorithm has a significant effect on the recovery of low-frequency vibration signals, and it can recover the vibration frequency as low as 0.01 Hz. Therefore, this system can provide a reference for ultra-long-distance detection.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112709"},"PeriodicalIF":4.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550167","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Ultrafast laser surface treatments for improved adhesion on carbon fiber-reinforced polymers 超快激光表面处理，提高碳纤维增强聚合物的附着力

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-06 DOI: 10.1016/j.optlastec.2025.112677

Qianliang Li , Ziwen Wang , Zhaoqing Li , Cong Jin , Zhen Zhang , Qibiao Yang , Lie Chen , Dun Liu

The surface preparation of carbon fiber-reinforced polymers (CFRPs) is crucial for effective bonding and profoundly affects joint quality and structural integrity. This study investigated the influence of the wavelength, pulse duration, fluence, and overscan number laser parameters on CFRP surface treatment and bonding performance. The extent of the resin residue and fiber damage on the CFRP surfaces following laser treatment was assessed utilizing image analysis software. The surface morphology of the CFRP was scrutinized using laser confocal microscopy and scanning electron microscopy (SEM). Contact angle measurements and X-ray photoelectron spectroscopy (XPS) were used to evaluate the surface wettability and chemical composition of the CFRP. The adhesive joint capabilities were rigorously tested to determine the causes of failures. The results revealed that laser treatment, which removed resin and integrated oxygen-containing functional groups, substantially increased the joint bonding strength. Notably, the femtosecond and picosecond green lasers at a fluence of 5.18 J/cm² significantly increased the shear strengths by 398.9 % and 393.9 %. A picosecond infrared laser at 3.69 J/cm² and a femtosecond infrared laser at 2.23 J/cm² achieved shear strength enhancements of 324.3 % and 337.9 %. Pre-treatment with a femtosecond green laser yielded the optimal shear strength. This study demonstrates that appropriate laser surface treatment can enhance CFRP bonding performance, particularly with the femtosecond lasers exhibiting superior shear strength enhancement. These findings offer a new strategy for efficient CFRP bonding and set the stage for further research to optimize laser parameters for broader industrial applications.

{"title":"Ultrafast laser surface treatments for improved adhesion on carbon fiber-reinforced polymers","authors":"Qianliang Li , Ziwen Wang , Zhaoqing Li , Cong Jin , Zhen Zhang , Qibiao Yang , Lie Chen , Dun Liu","doi":"10.1016/j.optlastec.2025.112677","DOIUrl":"10.1016/j.optlastec.2025.112677","url":null,"abstract":"<div><div>The surface preparation of carbon fiber-reinforced polymers (CFRPs) is crucial for effective bonding and profoundly affects joint quality and structural integrity. This study investigated the influence of the wavelength, pulse duration, fluence, and overscan number laser parameters on CFRP surface treatment and bonding performance. The extent of the resin residue and fiber damage on the CFRP surfaces following laser treatment was assessed utilizing image analysis software. The surface morphology of the CFRP was scrutinized using laser confocal microscopy and scanning electron microscopy (SEM). Contact angle measurements and X-ray photoelectron spectroscopy (XPS) were used to evaluate the surface wettability and chemical composition of the CFRP. The adhesive joint capabilities were rigorously tested to determine the causes of failures. The results revealed that laser treatment, which removed resin and integrated oxygen-containing functional groups, substantially increased the joint bonding strength. Notably, the femtosecond and picosecond green lasers at a fluence of 5.18 J/cm<sup>2</sup> significantly increased the shear strengths by 398.9 % and 393.9 %. A picosecond infrared laser at 3.69 J/cm<sup>2</sup> and a femtosecond infrared laser at 2.23 J/cm<sup>2</sup> achieved shear strength enhancements of 324.3 % and 337.9 %. Pre-treatment with a femtosecond green laser yielded the optimal shear strength. This study demonstrates that appropriate laser surface treatment can enhance CFRP bonding performance, particularly with the femtosecond lasers exhibiting superior shear strength enhancement. These findings offer a new strategy for efficient CFRP bonding and set the stage for further research to optimize laser parameters for broader industrial applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112677"},"PeriodicalIF":4.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563180","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Novel disordered Nd3+:Ca(Gd0.5Y0.5)Al3O7 melilite crystal: growth, spectroscopic properties, continuous wave and tunable laser performance

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-06 DOI: 10.1016/j.optlastec.2025.112674

Guoliang Deng , Wenfang Lin , Conghui Huang , Min Xu , Qiannan Fang , Li Shi , Xinkun Liu , Chengchun Zhao , Yin Hang

A novel Nd³⁺:Ca(Gd_0.5Y_0.5)Al₃O₇ melilite (Nd:CGYAM) crystal was designed and successfully grown. The structure and spectroscopic properties of the as-grown Nd:CGYAM crystal were investigated systematically. The lattice parameters of the Nd:CGYAM crystal are calculated to be a = b = 7.70584 Å, c = 5.06356 Å. The maximum phonon energy of the crystal is estimated as 767.7 cm⁻¹. Absorption spectrum shows the absorption cross-section is 2.09 × 10^-20 cm² at 809 nm in the Nd:CGYAM crystal, and its FWHM reaches 20.6 nm. The radiative lifetime of Nd³⁺:⁴F_3/2 level is 295.46 µs obtained by J-O analysis. The emission cross-section of the Nd:CGYAM crystal is 4.85 × 10^-20 cm² at 1062 nm, with a FWHM of 13.5 nm. The fluorescence lifetime of Nd³⁺:⁴F_3/2 level is fitted as 270.30 µs. Laser operation was conducted to study the laser performance of the Nd:CGYAM crystal. The maximum output power is 1.181 W, with a slope efficiency of 25.5 % and central wavelength of 1061.16 nm. Tunable laser operation shows the tunable range of the Nd:CGYAM crystal is separated into two segments, the first segment is 1059.22 nm – 1069.39 nm and the second one ranges from 1076.66 nm to 1081.02 nm. To the best of our knowledge, this is the first time to realize continuous wave and tunable laser output in Nd:CGYAM crystal. Summarizing the results above, the Nd:CGYAM crystal is proved to be a promising material candidate for ∼ 1.06 µm tunable laser applications.

{"title":"Novel disordered Nd3+:Ca(Gd0.5Y0.5)Al3O7 melilite crystal: growth, spectroscopic properties, continuous wave and tunable laser performance","authors":"Guoliang Deng , Wenfang Lin , Conghui Huang , Min Xu , Qiannan Fang , Li Shi , Xinkun Liu , Chengchun Zhao , Yin Hang","doi":"10.1016/j.optlastec.2025.112674","DOIUrl":"10.1016/j.optlastec.2025.112674","url":null,"abstract":"<div><div>A novel Nd<sup>3+</sup>:Ca(Gd<sub>0.5</sub>Y<sub>0.5</sub>)Al<sub>3</sub>O<sub>7</sub> melilite (Nd:CGYAM) crystal was designed and successfully grown. The structure and spectroscopic properties of the as-grown Nd:CGYAM crystal were investigated systematically. The lattice parameters of the Nd:CGYAM crystal are calculated to be <em>a</em> = <em>b</em> = 7.70584 Å, <em>c</em> = 5.06356 Å. The maximum phonon energy of the crystal is estimated as 767.7 cm<sup>−1</sup>. Absorption spectrum shows the absorption cross-section is 2.09 × 10<sup>-20</sup> cm<sup>2</sup> at 809 nm in the Nd:CGYAM crystal, and its FWHM reaches 20.6 nm. The radiative lifetime of Nd<sup>3+</sup>:<sup>4</sup>F<sub>3/2</sub> level is 295.46 µs obtained by J-O analysis. The emission cross-section of the Nd:CGYAM crystal is 4.85 × 10<sup>-20</sup> cm<sup>2</sup> at 1062 nm, with a FWHM of 13.5 nm. The fluorescence lifetime of Nd<sup>3+</sup>:<sup>4</sup>F<sub>3/2</sub> level is fitted as 270.30 µs. Laser operation was conducted to study the laser performance of the Nd:CGYAM crystal. The maximum output power is 1.181 W, with a slope efficiency of 25.5 % and central wavelength of 1061.16 nm. Tunable laser operation shows the tunable range of the Nd:CGYAM crystal is separated into two segments, the first segment is 1059.22 nm – 1069.39 nm and the second one ranges from 1076.66 nm to 1081.02 nm. To the best of our knowledge, this is the first time to realize continuous wave and tunable laser output in Nd:CGYAM crystal. Summarizing the results above, the Nd:CGYAM crystal is proved to be a promising material candidate for ∼ 1.06 µm tunable laser applications.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112674"},"PeriodicalIF":4.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550166","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Improvement of tensile and deforming abilities of Al/steel laser welded-brazed joints by addition of Si 通过添加硅改善铝/钢激光焊接-钎焊接头的拉伸和变形能力

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-06 DOI: 10.1016/j.optlastec.2025.112684

Baiyun Yang , Hongbo Xia , Jianfeng Gong , Jian Peng , Haoyue Li , Yukun Cao , Jingkun Yuan , Liqun Li , Caiwang Tan , Yuhua Chen

Al/steel structural parts have significant potential for application in electric vehicles (EVs). 6061 aluminum alloy jointed to DP590 steel in butt configuration successfully using laser weld-brazing with filler wires of varying Si content. Si can participate in interfacial reactions, inhibiting the bonding of Fe to Al and reducing the formation of brittle IMCs. Meanwhile, Si can replace the Al atoms in Fe-Al IMC, forming a less brittle Fe-Al-Si phase and reducing the thickness of IMC. Increasing the si content improves the joints’ tensile strength and bending properties. The Si substitution behavior of Al was clarified using first-principles calculations based on density functional theory. The computational results revealed that substituting Al atoms with Si atoms resulted in lower formation enthalpies and binding energies, indicating enhanced thermodynamic stability. Furthermore, the introduction of Fe-Si covalent bonding and the Si substitution behavior reduced the covalency of the IMCs, leading to a softening effect and reducing the hardness of the interface. Depending on the hardness of IMCs, the joints exhibited different fracture behaviors in the tensile and bending tests. The joint produced with AlSi12 filler wire demonstrated superior tensile strength and bending properties, achieving values of 143.1 MPa and 40.8°, which were 45.7 % and 57.5 % higher than those of the joint produced with pure Al filler wire (98.2 MPa and 25.9°).

{"title":"Improvement of tensile and deforming abilities of Al/steel laser welded-brazed joints by addition of Si","authors":"Baiyun Yang , Hongbo Xia , Jianfeng Gong , Jian Peng , Haoyue Li , Yukun Cao , Jingkun Yuan , Liqun Li , Caiwang Tan , Yuhua Chen","doi":"10.1016/j.optlastec.2025.112684","DOIUrl":"10.1016/j.optlastec.2025.112684","url":null,"abstract":"<div><div>Al/steel structural parts have significant potential for application in electric vehicles (EVs). 6061 aluminum alloy jointed to DP590 steel in butt configuration successfully using laser weld-brazing with filler wires of varying Si content. Si can participate in interfacial reactions, inhibiting the bonding of Fe to Al and reducing the formation of brittle IMCs. Meanwhile, Si can replace the Al atoms in Fe-Al IMC, forming a less brittle Fe-Al-Si phase and reducing the thickness of IMC. Increasing the si content improves the joints’ tensile strength and bending properties. The Si substitution behavior of Al was clarified using first-principles calculations based on density functional theory. The computational results revealed that substituting Al atoms with Si atoms resulted in lower formation enthalpies and binding energies, indicating enhanced thermodynamic stability. Furthermore, the introduction of Fe-Si covalent bonding and the Si substitution behavior reduced the covalency of the IMCs, leading to a softening effect and reducing the hardness of the interface. Depending on the hardness of IMCs, the joints exhibited different fracture behaviors in the tensile and bending tests. The joint produced with AlSi12 filler wire demonstrated superior tensile strength and bending properties, achieving values of 143.1 MPa and 40.8°, which were 45.7 % and 57.5 % higher than those of the joint produced with pure Al filler wire (98.2 MPa and 25.9°).</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112684"},"PeriodicalIF":4.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563183","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Damage analyses between Q-switched Tm-doped yttrium aluminum garnet and yttrium aluminum perovskite lasers and the application in thermoplastics processing Q 开关掺锝钇铝石榴石和钇铝过氧化物激光器之间的损伤分析以及在热塑性塑料加工中的应用

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-06 DOI: 10.1016/j.optlastec.2025.112741

Nan Li , Zhenchao Huang , Haizhou Huang , Jiangdian Zhang , Fei Shi , Wen Weng , Lixia Wu , Wenxiong Lin , Huaixi Chen , Huagang Liu

In this paper, we demonstrate damage analyses between Q-switched Tm-doped yttrium aluminum garnet (YAG) and yttrium aluminum perovskite (YAP) lasers with identical resonator configuration and demonstrate application of the pulsed Tm laser for transparent polymer processing. In the AO Q-switched Tm:YAG laser, shortest pulse width of 41 ns is obtained at 1 kHz with a peak power of 165.7 kW. However, owing to the distorted lattice and the resulted self-pulsing, Tm:YAP crystal is apt to damage at room temperature during Q-switching with low repetition frequencies, where maximum pulse energy of 2.73 mJ is obtained at 5 kHz. The results indicate that Tm:YAG laser is prone to operate at low PRFs (< 5 kHz) for high pulse energy and Tm:YAP laser is more suitable to achieve high average power at high PRFs due to its high emission cross section. Finally, a material processing platform basing on the pulsed Tm laser is built, where the marking and welding of thermoplastic PMMAs are explored compared to a common CW Tm laser. The results show the advantage of Q-switched Tm lasers in material processing, especially for transparent thermoplastic marking, welding or sealing during the scenarios such as biochemical researches and medical surgeries.

{"title":"Damage analyses between Q-switched Tm-doped yttrium aluminum garnet and yttrium aluminum perovskite lasers and the application in thermoplastics processing","authors":"Nan Li , Zhenchao Huang , Haizhou Huang , Jiangdian Zhang , Fei Shi , Wen Weng , Lixia Wu , Wenxiong Lin , Huaixi Chen , Huagang Liu","doi":"10.1016/j.optlastec.2025.112741","DOIUrl":"10.1016/j.optlastec.2025.112741","url":null,"abstract":"<div><div>In this paper, we demonstrate damage analyses between Q-switched Tm-doped yttrium aluminum garnet (YAG) and yttrium aluminum perovskite (YAP) lasers with identical resonator configuration and demonstrate application of the pulsed Tm laser for transparent polymer processing. In the AO Q-switched Tm:YAG laser, shortest pulse width of 41 ns is obtained at 1 kHz with a peak power of 165.7 kW. However, owing to the distorted lattice and the resulted self-pulsing, Tm:YAP crystal is apt to damage at room temperature during Q-switching with low repetition frequencies, where maximum pulse energy of 2.73 mJ is obtained at 5 kHz. The results indicate that Tm:YAG laser is prone to operate at low PRFs (< 5 kHz) for high pulse energy and Tm:YAP laser is more suitable to achieve high average power at high PRFs due to its high emission cross section. Finally, a material processing platform basing on the pulsed Tm laser is built, where the marking and welding of thermoplastic PMMAs are explored compared to a common CW Tm laser. The results show the advantage of Q-switched Tm lasers in material processing, especially for transparent thermoplastic marking, welding or sealing during the scenarios such as biochemical researches and medical surgeries.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112741"},"PeriodicalIF":4.6,"publicationDate":"2025-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143563182","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Fourier single-pixel imaging reconstruction network for unstable illumination

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-05 DOI: 10.1016/j.optlastec.2025.112695

Pengfei Jiang , Jianlong Liu , Xu Wang , Yingjie Fan , Zhen Yang , Jianlong Zhang , Yong Zhang , Xinding Jiang , Xu Yang

Fourier single-pixel imaging is a computational imaging technique that achieves high-quality imaging of target scenes by measuring the frequency spectrum coefficients of the scene. However, in unstable pulse laser illumination environments, Fourier single-pixel imaging is susceptible to the instability of laser’s power, resulting in a drastic degradation in imaging quality. Additionally, the multiple effects of noise and under-sampling further exacerbate the degradation of the quality of the imaging results. Although multi-pulse accumulation can mitigate these effects to some extent, it significantly increases imaging time, affecting real-time imaging. To address this issue, a Fourier single-pixel imaging reconstruction network for unstable illumination is proposed. The proposed method is mainly composed of a spectrum correction module, a noise estimation module and a denoising module. The spectrum correction module is used to eliminate the effect of unstable pulse lasers on imaging quality, reducing image distortion caused by laser pulses. The noise estimation module is utilized for noise estimation, while the denoising module ultimately eliminates the effect of noise to achieve high-quality reconstruction results. Simulation and experimental results demonstrate that the proposed method not only eliminates the effect of unstable pulse lasers on reconstruction results but also excels in noise processing, showcasing outstanding performance in recovering high-quality Fourier single-pixel imaging results.

{"title":"Fourier single-pixel imaging reconstruction network for unstable illumination","authors":"Pengfei Jiang , Jianlong Liu , Xu Wang , Yingjie Fan , Zhen Yang , Jianlong Zhang , Yong Zhang , Xinding Jiang , Xu Yang","doi":"10.1016/j.optlastec.2025.112695","DOIUrl":"10.1016/j.optlastec.2025.112695","url":null,"abstract":"<div><div>Fourier single-pixel imaging is a computational imaging technique that achieves high-quality imaging of target scenes by measuring the frequency spectrum coefficients of the scene. However, in unstable pulse laser illumination environments, Fourier single-pixel imaging is susceptible to the instability of laser’s power, resulting in a drastic degradation in imaging quality. Additionally, the multiple effects of noise and under-sampling further exacerbate the degradation of the quality of the imaging results. Although multi-pulse accumulation can mitigate these effects to some extent, it significantly increases imaging time, affecting real-time imaging. To address this issue, a Fourier single-pixel imaging reconstruction network for unstable illumination is proposed. The proposed method is mainly composed of a spectrum correction module, a noise estimation module and a denoising module. The spectrum correction module is used to eliminate the effect of unstable pulse lasers on imaging quality, reducing image distortion caused by laser pulses. The noise estimation module is utilized for noise estimation, while the denoising module ultimately eliminates the effect of noise to achieve high-quality reconstruction results. Simulation and experimental results demonstrate that the proposed method not only eliminates the effect of unstable pulse lasers on reconstruction results but also excels in noise processing, showcasing outstanding performance in recovering high-quality Fourier single-pixel imaging results.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112695"},"PeriodicalIF":4.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Repetition rate continuously reconfigurable supercontinuum generation using an all-fiber non-mode-locked source

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-05 DOI: 10.1016/j.optlastec.2025.112747

Yanyan Deng , Jiaxin Liu , Yifan Qin , Yanshen Sun , Hongshuo Wang , Shuowen Chen , Songyi Wang , Shuyi Chen , He Zhang , Yu Zhang , Zhihai Liu , Zhiwei Lu , Yuanqin Xia

This paper presents a cost-effective, all-fiber, non-mode-locked supercontinuum (SC) source with continuously reconfigurable repetition rates of up to 10 GHz, utilizing a time-lens mechanism. The time-lens applies temporal quadratic phase modulation to a continuous wave laser, effectively broadening its spectral bandwidth through fiber-integrated electro-optic phase modulators. Dispersion compensation is employed to generate picosecond pulses, with the repetition rate independently controlled by an electro-optic intensity modulator. These pulses are injected into highly nonlinear fibers (HNLFs) to generate SC pulse trains through nonlinear optical effects. The SC source achieves flat spectral ranges across 1660–1800 nm, 1435–1520 nm, and 1351–1463 nm by employing different HNLFs, each with unique dispersion characteristics. Within each HNLF, the spectral shapes and relative intensity distributions remain consistent under varying repetition rates. The SC source also exhibits low noise and excellent beam quality, ensuring reliable and versatile performance for applications requiring tunable temporal and spectral parameters, such as nonlinear microscopy and high-precision vibration detection.

{"title":"Repetition rate continuously reconfigurable supercontinuum generation using an all-fiber non-mode-locked source","authors":"Yanyan Deng , Jiaxin Liu , Yifan Qin , Yanshen Sun , Hongshuo Wang , Shuowen Chen , Songyi Wang , Shuyi Chen , He Zhang , Yu Zhang , Zhihai Liu , Zhiwei Lu , Yuanqin Xia","doi":"10.1016/j.optlastec.2025.112747","DOIUrl":"10.1016/j.optlastec.2025.112747","url":null,"abstract":"<div><div>This paper presents a cost-effective, all-fiber, non-mode-locked supercontinuum (SC) source with continuously reconfigurable repetition rates of up to 10 GHz, utilizing a time-lens mechanism. The time-lens applies temporal quadratic phase modulation to a continuous wave laser, effectively broadening its spectral bandwidth through fiber-integrated electro-optic phase modulators. Dispersion compensation is employed to generate picosecond pulses, with the repetition rate independently controlled by an electro-optic intensity modulator. These pulses are injected into highly nonlinear fibers (HNLFs) to generate SC pulse trains through nonlinear optical effects. The SC source achieves flat spectral ranges across 1660–1800 nm, 1435–1520 nm, and 1351–1463 nm by employing different HNLFs, each with unique dispersion characteristics. Within each HNLF, the spectral shapes and relative intensity distributions remain consistent under varying repetition rates. The SC source also exhibits low noise and excellent beam quality, ensuring reliable and versatile performance for applications requiring tunable temporal and spectral parameters, such as nonlinear microscopy and high-precision vibration detection.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112747"},"PeriodicalIF":4.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550989","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Direct generation of visible short-pulse vortex beam in a blue LD-pumped electro-optically Q-switched Pr: YLF laser

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-05 DOI: 10.1016/j.optlastec.2025.112740

Haotian Gao , Qi Yang , Xiaoyang Guo , Wenhui Ji , Yuqian Zu , Chun Li , Syed Zaheer Ud Din , Yongjing Wu , Ruizhan Zhai , Zhongqing Jia

We report on the direct generation of visible short-pulse vortex beam in a blue LD-pumped electro-optically (EO) Q-switched Pr:YLF laser. A Q-switched fundamental (TEM₀₀) mode laser has been realized with the pulse width of 52.2 ns and the single pulse energy of 22.2 μJ at the repetition rate of 10 kHz. By employing the spot-defect on the surface of the cavity mirror, the vortex modes of visible short-pulse lasers have been achieved. The laser yield Q-switched pulse width of 180.4 ns and pulse energy of 8.0 μJ at a repetition rate of 10 kHz in the first order Laguerre Gaussian (LG₀₁) mode. By adjusting the radius of spot-defect, a Q-switched pulse width of 273.5 ns and pulse energy of 6.0 μJ at a repetition rate of 10 kHz in the second order Laguerre Gaussian (LG₀₂) mode has also been achieved. This study provides an effective method for generating high energy arbitrary order visible short-pulse vortex lasers, which has promising potential in fields such as materials processing and super-resolution imaging.

{"title":"Direct generation of visible short-pulse vortex beam in a blue LD-pumped electro-optically Q-switched Pr: YLF laser","authors":"Haotian Gao , Qi Yang , Xiaoyang Guo , Wenhui Ji , Yuqian Zu , Chun Li , Syed Zaheer Ud Din , Yongjing Wu , Ruizhan Zhai , Zhongqing Jia","doi":"10.1016/j.optlastec.2025.112740","DOIUrl":"10.1016/j.optlastec.2025.112740","url":null,"abstract":"<div><div>We report on the direct generation of visible short-pulse vortex beam in a blue LD-pumped electro-optically (EO) Q-switched Pr:YLF laser. A Q-switched fundamental (TEM<sub>00</sub>) mode laser has been realized with the pulse width of 52.2 ns and the single pulse energy of 22.2 μJ at the repetition rate of 10 kHz. By employing the spot-defect on the surface of the cavity mirror, the vortex modes of visible short-pulse lasers have been achieved. The laser yield Q-switched pulse width of 180.4 ns and pulse energy of 8.0 μJ at a repetition rate of 10 kHz in the first order Laguerre Gaussian (LG<sub>01</sub>) mode. By adjusting the radius of spot-defect, a Q-switched pulse width of 273.5 ns and pulse energy of 6.0 μJ at a repetition rate of 10 kHz in the second order Laguerre Gaussian (LG<sub>02</sub>) mode has also been achieved. This study provides an effective method for generating high energy arbitrary order visible short-pulse vortex lasers, which has promising potential in fields such as materials processing and super-resolution imaging.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112740"},"PeriodicalIF":4.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550165","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Hybrid attention graph neural network for dynamic spatiotemporal wavefront prediction in adaptive optics

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-05 DOI: 10.1016/j.optlastec.2025.112730

Zhijian Qin , Wenjun Jiang , Ju Tang , Jiazhen Dou , Liyun Zhong , Jianglei Di , Yuwen Qin

Adaptive optics (AO) systems, inherently constrained by delay errors, suffer from limitations in their correction performance. The proposed predictive AO technology aims to mitigate these delays, thereby enhancing the system’s correction bandwidth. However, existing predictive algorithms primarily focus on extracting temporal features while neglecting the spatial characteristics during prediction, which compromises the generalization robustness. In this paper, we introduce a hybrid attention graph neural network (HAG-Net) for dynamic spatiotemporal wavefront prediction. HAG-Net combines temporal convolution and graph convolution to effectively capture both spatiotemporal features of wavefront data, while the integration of a dynamic graph learning and attention mechanism enhances the extraction of spatial correlations between wavefront frames, resulting in superior predictive accuracy. We compared HAG-Net with two established predictive algorithms and evaluated their performance under various atmospheric conditions. In simulations, HAG-Net reduces the mean and standard deviation of root square error (RMS) by 55.8% and 61.7%, respectively, compared to traditional AO. Experimental results further demonstrate that our method increased the maximum far-field focusing intensity by approximately 4.6 times relative to the uncorrected scenario. HAG-Net consistently outperformed other algorithms in both simulated and experimental settings, positioning it as a promising solution for addressing latency challenges in closed-loop AO systems.

自适应光学（AO）系统本身受制于延迟误差，其校正性能受到限制。所提出的预测性自适应光学技术旨在减少这些延迟，从而提高系统的校正带宽。然而，现有的预测算法主要侧重于提取时间特征，而忽略了预测过程中的空间特征，从而影响了泛化的鲁棒性。本文介绍了一种用于动态时空波前预测的混合注意力图神经网络（HAG-Net）。HAG-Net 结合了时间卷积和图卷积，能有效捕捉波前数据的时空特征，同时融合了动态图学习和注意力机制，增强了对波前帧间空间相关性的提取，从而提高了预测精度。我们将 HAG-Net 与两种成熟的预测算法进行了比较，并评估了它们在各种大气条件下的性能。在模拟实验中，与传统的 AO 相比，HAG-Net 将平方根误差（RMS）的平均值和标准偏差分别降低了 55.8% 和 61.7%。实验结果进一步证明，与未校正情况相比，我们的方法将最大远场聚焦强度提高了约 4.6 倍。在模拟和实验设置中，HAG-Net 的性能始终优于其他算法，因此它是解决闭环光学光学系统延迟难题的一种有前途的解决方案。

{"title":"Hybrid attention graph neural network for dynamic spatiotemporal wavefront prediction in adaptive optics","authors":"Zhijian Qin , Wenjun Jiang , Ju Tang , Jiazhen Dou , Liyun Zhong , Jianglei Di , Yuwen Qin","doi":"10.1016/j.optlastec.2025.112730","DOIUrl":"10.1016/j.optlastec.2025.112730","url":null,"abstract":"<div><div>Adaptive optics (AO) systems, inherently constrained by delay errors, suffer from limitations in their correction performance. The proposed predictive AO technology aims to mitigate these delays, thereby enhancing the system’s correction bandwidth. However, existing predictive algorithms primarily focus on extracting temporal features while neglecting the spatial characteristics during prediction, which compromises the generalization robustness. In this paper, we introduce a hybrid attention graph neural network (HAG-Net) for dynamic spatiotemporal wavefront prediction. HAG-Net combines temporal convolution and graph convolution to effectively capture both spatiotemporal features of wavefront data, while the integration of a dynamic graph learning and attention mechanism enhances the extraction of spatial correlations between wavefront frames, resulting in superior predictive accuracy. We compared HAG-Net with two established predictive algorithms and evaluated their performance under various atmospheric conditions. In simulations, HAG-Net reduces the mean and standard deviation of root square error (RMS) by 55.8% and 61.7%, respectively, compared to traditional AO. Experimental results further demonstrate that our method increased the maximum far-field focusing intensity by approximately 4.6 times relative to the uncorrected scenario. HAG-Net consistently outperformed other algorithms in both simulated and experimental settings, positioning it as a promising solution for addressing latency challenges in closed-loop AO systems.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112730"},"PeriodicalIF":4.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550742","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

High saturation and extending color gamut of reflective structural color using SiO2-TiO2 double-layer all-dielectric metasurface

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-03-05 DOI: 10.1016/j.optlastec.2025.112638

Hongyan Yang , Yuhang Yang , Hongrun Sun , Qiming Li , Quanlin He , Gongli Xiao , Bing Wang , Jianqing Li

Metallic nanostructures exhibit limitations in generating high-performance structural colors due to inherent ohmic losses and interband transitions. The elevated refractive index of dielectric materials can facilitate high-order Mie resonance at shorter wavelengths, leading to a decrease in color saturation. To overcome these challenges, this study employs the principle of surface lattice resonance to investigate the impact of various refractive index top layers on the reflection spectrum and to select appropriate coating materials. Develop a SiO₂-TiO

_{2}

double-layer disk array by integrating an all-dielectric metasurface on a SiO₂ substrate. We achieve high-performance structural colors characterized by a minimum bandwidth of less than 7 nm, reflectance levels reaching up to 99%, and saturation levels attaining 100% within the visible spectrum range of 400-700 nm. Moreover, by modifying the geometry of the SiO₂-TiO

_{2}

double-layer all-dielectric metamaterials, we successfully extend the color gamut to 168.2% sRGB and 124.6% Adobe RGB and 56.1% CIE color gamut space. The findings of this study present significant potential for applications in color display, data storage, and anti-counterfeiting technologies, offering empirical theoretical support for these domains.

{"title":"High saturation and extending color gamut of reflective structural color using SiO2-TiO2 double-layer all-dielectric metasurface","authors":"Hongyan Yang , Yuhang Yang , Hongrun Sun , Qiming Li , Quanlin He , Gongli Xiao , Bing Wang , Jianqing Li","doi":"10.1016/j.optlastec.2025.112638","DOIUrl":"10.1016/j.optlastec.2025.112638","url":null,"abstract":"<div><div>Metallic nanostructures exhibit limitations in generating high-performance structural colors due to inherent ohmic losses and interband transitions. The elevated refractive index of dielectric materials can facilitate high-order Mie resonance at shorter wavelengths, leading to a decrease in color saturation. To overcome these challenges, this study employs the principle of surface lattice resonance to investigate the impact of various refractive index top layers on the reflection spectrum and to select appropriate coating materials. Develop a SiO<sub>2</sub>-TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> double-layer disk array by integrating an all-dielectric metasurface on a SiO<sub>2</sub> substrate. We achieve high-performance structural colors characterized by a minimum bandwidth of less than 7 nm, reflectance levels reaching up to 99%, and saturation levels attaining 100% within the visible spectrum range of 400-700 nm. Moreover, by modifying the geometry of the SiO<sub>2</sub>-TiO<span><math><msub><mrow></mrow><mrow><mn>2</mn></mrow></msub></math></span> double-layer all-dielectric metamaterials, we successfully extend the color gamut to 168.2% sRGB and 124.6% Adobe RGB and 56.1% CIE color gamut space. The findings of this study present significant potential for applications in color display, data storage, and anti-counterfeiting technologies, offering empirical theoretical support for these domains.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"186 ","pages":"Article 112638"},"PeriodicalIF":4.6,"publicationDate":"2025-03-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143550987","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0