Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111879
Xiao Fang, Andrew Wells
Laser ignition of energetic materials has shown promise in eliminating sensitive primary explosives to initiate a main explosive charge. To enhance the laser ignitibility of energetic material cyclotrimethylenetrinitramine (RDX) with a near-infrared diode laser, the RDX was re-crystallized with three optical sensitizers: COOH-PEGylated gold nanorods (both solution and dry gold nanoparticle) and laser absorbing dye. Optical microscopy was undertaken on the crystals to investigate the uniformity of doping of the optical sensitizers. High-speed video was used to experimentally observe the enhanced laser ignitability of these RDX crystals. The solution gold nanoparticles enhanced doping uniformity resulting in it being an effective optical sensitizer. Compared to the other two optical sensitizers, the solution gold nanoparticles optical sensitizer significantly enhanced the laser ignitibility of RDX by reducing the required power density to as little as 79 Wcm−2 to achieve ignition. At this laser power density, the ignition delay was approximately 68 ms.
{"title":"Laser ignition of energetic crystals of cyclotrimethylenetrinitramine (RDX) optically sensitized with gold nanoparticles and light-absorbing dye","authors":"Xiao Fang, Andrew Wells","doi":"10.1016/j.optlastec.2024.111879","DOIUrl":"10.1016/j.optlastec.2024.111879","url":null,"abstract":"<div><div>Laser ignition of energetic materials has shown promise in eliminating sensitive primary explosives to initiate a main explosive charge. To enhance the laser ignitibility of energetic material cyclotrimethylenetrinitramine (RDX) with a near-infrared diode laser, the RDX was re-crystallized with three optical sensitizers: COOH-PEGylated gold nanorods (both solution and dry gold nanoparticle) and laser absorbing dye. Optical microscopy was undertaken on the crystals to investigate the uniformity of doping of the optical sensitizers. High-speed video was used to experimentally observe the enhanced laser ignitability of these RDX crystals. The solution gold nanoparticles enhanced doping uniformity resulting in it being an effective optical sensitizer. Compared to the other two optical sensitizers, the solution gold nanoparticles optical sensitizer significantly enhanced the laser ignitibility of RDX by reducing the required power density to as little as 79 Wcm<sup>−2</sup> to achieve ignition. At this laser power density, the ignition delay was approximately 68 ms.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111879"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422673","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Besides their fundamental significance as f-electron materilas, lanthanide compounds have remarkable interest as potential candidates for catalytic, luminescent, optical communication, spintronics, energy, and biomedical applications. This study reports on the systematic quantum computational analysis on the geometrical structure properties, phonon vibrational, electronic, and light-assisted optical properties of two compounds of the lanthanide oxyhalides family, LnOI (Ln = La, Sm). The reported vibrational properties are phonon energy spectra and phonon density of states, the optical properties include complex dielectric parameter, reflectivity, index of refraction, absorption coefficient, loss function, extinction coefficient, and optical conductivity. For the required results on the targeted properties, the first-principles procedure based on Kohn-Sham density functional theory is employed. To account for the electronic exchange correlations, general gradient approximation within Hubbard model is used. The computed results predict the wide bandgap semiconducting nature of LnOIs with bandgaps of 3.44 eV for LaOI and 3.5 eV for SmOI. The optoelectronic properties reveal prominent feature in the visible and high energy regions, thus leading to potential implications to high-speed, high-power optoelectronics, and lighting devices.
镧系元素化合物除了作为 f 电子材料具有重要的基础意义外，作为催化、发光、光通信、自旋电子学、能源和生物医学应用的潜在候选物质，也引起了人们的极大兴趣。本研究报告对镧系元素氧卤化物家族的两种化合物 LnOI（Ln = La、Sm）的几何结构特性、声子振动特性、电子特性和光助光学特性进行了系统的量子计算分析。报告的振动特性包括声子能谱和声子态密度，光学特性包括复介电参数、反射率、折射率、吸收系数、损耗函数、消光系数和光导率。为了获得所需的目标特性结果，我们采用了基于 Kohn-Sham 密度泛函理论的第一原理程序。为了考虑电子交换相关性，采用了哈伯德模型中的一般梯度近似。计算结果预测了 LnOIs 的宽带隙半导体性质，LaOI 和 SmOI 的带隙分别为 3.44 eV 和 3.5 eV。光电特性显示了其在可见光和高能量区域的突出特点，从而对高速、大功率光电和照明设备产生了潜在影响。
{"title":"Quantum computational insights into electronic and optical properties of LnOIs for fundamental and technological applications","authors":"Azmat Iqbal Bashir , Syed Maher Gillani , Sikander Azam , M.H. Sahafi , Amin Ur Rahman","doi":"10.1016/j.optlastec.2024.111940","DOIUrl":"10.1016/j.optlastec.2024.111940","url":null,"abstract":"<div><div>Besides their fundamental significance as f-electron materilas, lanthanide compounds have remarkable interest as potential candidates for catalytic, luminescent, optical communication, spintronics, energy, and biomedical applications. This study reports on the systematic quantum computational analysis on the geometrical structure properties, phonon vibrational, electronic, and light-assisted optical properties of two compounds of the lanthanide oxyhalides family, LnOI (Ln = La, Sm). The reported vibrational properties are phonon energy spectra and phonon density of states, the optical properties include complex dielectric parameter, reflectivity, index of refraction, absorption coefficient, loss function, extinction coefficient, and optical conductivity. For the required results on the targeted properties, the first-principles procedure based on Kohn-Sham density functional theory is employed. To account for the electronic exchange correlations, general gradient approximation within Hubbard model is used. The computed results predict the wide bandgap semiconducting nature of LnOIs with bandgaps of 3.44 eV for LaOI and 3.5 eV for SmOI. The optoelectronic properties reveal prominent feature in the visible and high energy regions, thus leading to potential implications to high-speed, high-power optoelectronics, and lighting devices.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111940"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422110","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111903
FaJing Li , XinYang Yu , KeLi Chen , JiaQi Luo , ShouPing Nie , Jun Ma , CaoJin Yuan
Beams with controllable shapes and multiple zero intensity breaks hold particular significance in optical trapping, optical encryption, and optical communication. In this work, an anomalous polygonal azimuthal-gap beam (APAB) exhibiting controllable discontinuous intensity distribution is proposed and studied both theoretically and experimentally. The APAB features multiple zero intensity breaks within its polygonal intensity pattern by setting multiple the binarization thresholds and modulating parameters of the free lens phases. Additionally, the specific number and arrangement of azimuthal gaps by combining multiple APABs make up a beam array characterized by the various configurations of azimuthal-gaps and customized intensity profiles. The particle manipulation characteristics of the designed APABs are verified by optical tweezer experiments. It is demonstrated that the APABs utilize azimuthal-gap location as a new dimension to stably trap, locate, rotate, disperse particles, and guide particles, while the polygonal intensity guides particles along specific paths. Due to its unique properties, APAB will have many promising applications such as multi-particle trapping in 3D orientation, optical communication, lensless imaging, and optical multiplexing technology.
{"title":"The tailorable the anomalous polygonal azimuthal-gap beam with binarization threshold for inducing particle motion","authors":"FaJing Li , XinYang Yu , KeLi Chen , JiaQi Luo , ShouPing Nie , Jun Ma , CaoJin Yuan","doi":"10.1016/j.optlastec.2024.111903","DOIUrl":"10.1016/j.optlastec.2024.111903","url":null,"abstract":"<div><div>Beams with controllable shapes and multiple zero intensity breaks hold particular significance in optical trapping, optical encryption, and optical communication. In this work, an anomalous polygonal azimuthal-gap beam (APAB) exhibiting controllable discontinuous intensity distribution is proposed and studied both theoretically and experimentally. The APAB features multiple zero intensity breaks within its polygonal intensity pattern by setting multiple the binarization thresholds and modulating parameters of the free lens phases. Additionally, the specific number and arrangement of azimuthal gaps by combining multiple APABs make up a beam array characterized by the various configurations of azimuthal-gaps and customized intensity profiles. The particle manipulation characteristics of the designed APABs are verified by optical tweezer experiments. It is demonstrated that the APABs utilize azimuthal-gap location as a new dimension to stably trap, locate, rotate, disperse particles, and guide particles, while the polygonal intensity guides particles along specific paths. Due to its unique properties, APAB will have many promising applications such as multi-particle trapping in 3D orientation, optical communication, lensless imaging, and optical multiplexing technology.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111903"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422188","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111866
Shan Gao , Zhiwei Chen , Hailong Liu , Yue Han , Liwei Chen , Ying Cui , Tong Wang , Zezhan Zhang , Jing Jiang , Yi Niu , Chao Wang
As a method to monitor the condition of complex super-characteristic materials, non-contact temperature measurement has been widely used in extreme environment measurement, but its temperature measurement results are greatly affected by the surface emissivity of complex materials. The characteristic trend of surface emissivity of complex materials is often uncertain and difficult to calculate directly due to many factors. In this paper, we propose a temperature measurement method for complex material surface multi-spectral data processing for simultaneous computational inversion of emissivity and temperature of complex materials. The inversion results show that the method can solve the problem of unknown surface emissivity of complex materials, and the temperature inversion error is less than 1%, which is expected to be applied to temperature monitoring in extreme environment for complex materials.
{"title":"Multispectral radiation temperature data processing algorithm for high temperature complex material surface","authors":"Shan Gao , Zhiwei Chen , Hailong Liu , Yue Han , Liwei Chen , Ying Cui , Tong Wang , Zezhan Zhang , Jing Jiang , Yi Niu , Chao Wang","doi":"10.1016/j.optlastec.2024.111866","DOIUrl":"10.1016/j.optlastec.2024.111866","url":null,"abstract":"<div><div>As a method to monitor the condition of complex super-characteristic materials, non-contact temperature measurement has been widely used in extreme environment measurement, but its temperature measurement results are greatly affected by the surface emissivity of complex materials. The characteristic trend of surface emissivity of complex materials is often uncertain and difficult to calculate directly due to many factors. In this paper, we propose a temperature measurement method for complex material surface multi-spectral data processing for simultaneous computational inversion of emissivity and temperature of complex materials. The inversion results show that the method can solve the problem of unknown surface emissivity of complex materials, and the temperature inversion error is less than 1%, which is expected to be applied to temperature monitoring in extreme environment for complex materials.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111866"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422090","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111882
Zhehao Wu , Jianing Cao , Wenshu Liu , Chencheng Shang , Zongxiao Fan , Huimin Yue , Chen Wei , Yong Liu
In this paper, we propose a gain-switched Ho3+-doped fiber laser to realize high-power nanosecond pulsed laser emission at ∼3.9 μm by leveraging a continuous-wave (CW) pump source at ∼1.95 μm and a pulsed pump source at ∼1.66 μm. Numerical investigation is carried out to analyze the influences of different pump parameters on the laser output performance. Moreover, stable single-pulse operation range is predicted under various average pump powers, pulse widths, and repetition frequencies of the 1660 nm pump source. Stable single-pulse operation is achieved with the average power of 1.08 W and laser pulse energy of 10.87μJ, which are both an order of magnitude improvement over the ones obtained with conventional single wavelength pumping at 888 nm, and also reach the level of the more maturely developed gain-switched Er3+ and/or Dy3+ doped fiber lasers with laser emission at shorter wavelengths of 2.8 μm, 3.2 μm and 3.5 μm. The pulse width and repetition frequency of the output laser are 18.72 ns and 100 kHz, respectively. The proposed gain-switched cascade pumped Ho3+-doped fiber laser is a promising approach for the realization of high-power and high-energy fiber laser emission at the important ∼3.9 μm mid-infrared wavelength.
{"title":"Modeling and characteristics of high-power gain-switched Ho3+-doped fiber laser at ∼ 3.9 μm with cascade pumping","authors":"Zhehao Wu , Jianing Cao , Wenshu Liu , Chencheng Shang , Zongxiao Fan , Huimin Yue , Chen Wei , Yong Liu","doi":"10.1016/j.optlastec.2024.111882","DOIUrl":"10.1016/j.optlastec.2024.111882","url":null,"abstract":"<div><div>In this paper, we propose a gain-switched Ho<sup>3+</sup>-doped fiber laser to realize high-power nanosecond pulsed laser emission at ∼3.9 μm by leveraging a continuous-wave (CW) pump source at ∼1.95 μm and a pulsed pump source at ∼1.66 μm. Numerical investigation is carried out to analyze the influences of different pump parameters on the laser output performance. Moreover, stable single-pulse operation range is predicted under various average pump powers, pulse widths, and repetition frequencies of the 1660 nm pump source. Stable single-pulse operation is achieved with the average power of 1.08 W and laser pulse energy of 10.87μJ, which are both an order of magnitude improvement over the ones obtained with conventional single wavelength pumping at 888 nm, and also reach the level of the more maturely developed gain-switched Er<sup>3+</sup> and/or Dy<sup>3+</sup> doped fiber lasers with laser emission at shorter wavelengths of 2.8 μm, 3.2 μm and 3.5 μm. The pulse width and repetition frequency of the output laser are 18.72 ns and 100 kHz, respectively. The proposed gain-switched cascade pumped Ho<sup>3+</sup>-doped fiber laser is a promising approach for the realization of high-power and high-energy fiber laser emission at the important ∼3.9 μm mid-infrared wavelength.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111882"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422106","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}
In large deformation measurement, digital image correlation (DIC1) using functional forms can no longer describe the complex changes in grayscale information and morphology of sub-regions. To address this issue, particle filtering (PF) can be combined with color DIC (PFDIC2) to establish a color distribution model to describe sub-regions, but PFDIC has poor performance. Therefore, this paper proposes an integrated adaptive particle filtering-based color digital image correlation (APF-DIC3). This method first constructs a dynamic color distribution model based on ACFEF4 to describe the sub-region. It then introduces the SSKL5 correlation coefficient to measure the similarity between sub-regions, and establishes TAR6 to adaptively adjust the number of particles, ultimately achieving adaptive matching of sub-regions under complex deformations. Performance evaluation and simulation results show that APF-DIC significantly improves the accuracy, robustness, and computational efficiency of the algorithm. Real experimental results further verify the effectiveness of APF-DIC, demonstrating its excellent illumination invariance.
{"title":"Integrated adaptive particle filtering-based color digital image correlation for large deformation measurement","authors":"Xiao-Yong Liu, Xiao-Wei Zhang, Rong-Li Li, ZhaoPeng Hao, Kai-Kai Li, Xiao-Ri Pei, Dongwei Gu, Qihan Li, Jia-Ming Hu, Guo-Qing Han","doi":"10.1016/j.optlastec.2024.111938","DOIUrl":"10.1016/j.optlastec.2024.111938","url":null,"abstract":"<div><div>In large deformation measurement, digital image correlation (DIC<span><span><sup>1</sup></span></span>) using functional forms can no longer describe the complex changes in grayscale information and morphology of sub-regions. To address this issue, particle filtering (PF) can be combined with color DIC (PFDIC<span><span><sup>2</sup></span></span>) to establish a color distribution model to describe sub-regions, but PFDIC has poor performance. Therefore, this paper proposes an integrated adaptive particle filtering-based color digital image correlation (APF-DIC<span><span><sup>3</sup></span></span>). This method first constructs a dynamic color distribution model based on ACFEF<span><span><sup>4</sup></span></span> to describe the sub-region. It then introduces the SSKL<span><span><sup>5</sup></span></span> correlation coefficient to measure the similarity between sub-regions, and establishes TAR<span><span><sup>6</sup></span></span> to adaptively adjust the number of particles, ultimately achieving adaptive matching of sub-regions under complex deformations. Performance evaluation and simulation results show that APF-DIC significantly improves the accuracy, robustness, and computational efficiency of the algorithm. Real experimental results further verify the effectiveness of APF-DIC, demonstrating its excellent illumination invariance.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111938"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422108","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111929
Zhenchao Huang , Yunping Cai , Zhiwang Zhang , Nan Li , Fei Shi , Wenxiong Lin , Huagang Liu
It is a great technical challenge to fabricate micro-holes in hard materials, such as tungsten and diamond, especially for controllable taper angle and low heat affected zone. In this paper, a simple method employing a 355 nm nanosecond laser, as well as a dual-path circular scanning strategy are presented to overcome these challenges. This method can adjust the angle between the laser beam and the rotation axis by altering the angle of the tilt stage, thereby enabling the controlled machining of micro-holes with tapers ranging from negative to positive. Additionally, comparative experiments with traditional circular scanning strategies have demonstrated that the dual-path circular scanning strategy effectively improves the roundness, drilling efficiency, and sidewall quality of micro-holes by expanding the ablation area. Using this method and strategy, micro-holes with tapers ranging from −14.9° to 23.8° were successfully fabricated in 300 μm-thick tungsten. Furthermore, they were employed to prepare a series of high-quality micro-holes on a typical nonmetallic high-hardness material, diamond.
{"title":"Laser drilling of micro-holes with controllable taper using 355 nm nanosecond laser","authors":"Zhenchao Huang , Yunping Cai , Zhiwang Zhang , Nan Li , Fei Shi , Wenxiong Lin , Huagang Liu","doi":"10.1016/j.optlastec.2024.111929","DOIUrl":"10.1016/j.optlastec.2024.111929","url":null,"abstract":"<div><div>It is a great technical challenge to fabricate micro-holes in hard materials, such as tungsten and diamond, especially for controllable taper angle and low heat affected zone. In this paper, a simple method employing a 355 nm nanosecond laser, as well as a dual-path circular scanning strategy are presented to overcome these challenges. This method can adjust the angle between the laser beam and the rotation axis by altering the angle of the tilt stage, thereby enabling the controlled machining of micro-holes with tapers ranging from negative to positive. Additionally, comparative experiments with traditional circular scanning strategies have demonstrated that the dual-path circular scanning strategy effectively improves the roundness, drilling efficiency, and sidewall quality of micro-holes by expanding the ablation area. Using this method and strategy, micro-holes with tapers ranging from −14.9° to 23.8° were successfully fabricated in 300 μm-thick tungsten. Furthermore, they were employed to prepare a series of high-quality micro-holes on a typical nonmetallic high-hardness material, diamond.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111929"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422107","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111932
Xinlong Zhao , Guanhai Shi , Ningkang Deng , Yongfeng Qu , Jin Yuan , Liang Du , Wenbo Hu , Zhaoyang Zhang , Hongxing Wang
In high-power laser systems, thermal lensing effects and thermal birefringence in laser gain media significantly impact beam quality and stability. This study simulates different end-capped structures of Nd:YAG gain media to assess their effect on thermal characteristics. Thermal lensing effects were evaluated through optical path differences and thermal focal lengths, while thermal birefringence effects were assessed using depolarization losses. Results show that diamond cap can reduce the peak temperature of the gain medium by 30.0 K. Optical path difference and thermal focal length changes confirm that diamond caps can minimize the thermal lensing effect. Moreover, the reduction of the depolarization loss suggests a reduction in the polarization state. Futhermore, this paper explores the optimization of diamond geometry to enhance laser system stability. Larger diamond radii and thicknesses prove more effective in diminishing optical path differences and depolarization loss, with changes in radius showing a significant impact on thermal performance. This research enhances laser stability and performance and lays a theoretical foundation for future laser thermal management strategies.
{"title":"Thermal effect suppression of end-pumped rod-like Nd:YAG laser crystal utilizing the diamond cap strategy","authors":"Xinlong Zhao , Guanhai Shi , Ningkang Deng , Yongfeng Qu , Jin Yuan , Liang Du , Wenbo Hu , Zhaoyang Zhang , Hongxing Wang","doi":"10.1016/j.optlastec.2024.111932","DOIUrl":"10.1016/j.optlastec.2024.111932","url":null,"abstract":"<div><div>In high-power laser systems, thermal lensing effects and thermal birefringence in laser gain media significantly impact beam quality and stability. This study simulates different end-capped structures of Nd:YAG gain media to assess their effect on thermal characteristics. Thermal lensing effects were evaluated through optical path differences and thermal focal lengths, while thermal birefringence effects were assessed using depolarization losses. Results show that diamond cap can reduce the peak temperature of the gain medium by 30.0 K. Optical path difference and thermal focal length changes confirm that diamond caps can minimize the thermal lensing effect. Moreover, the reduction of the depolarization loss suggests a reduction in the polarization state. Futhermore, this paper explores the optimization of diamond geometry to enhance laser system stability. Larger diamond radii and thicknesses prove more effective in diminishing optical path differences and depolarization loss, with changes in radius showing a significant impact on thermal performance. This research enhances laser stability and performance and lays a theoretical foundation for future laser thermal management strategies.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111932"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422189","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}
Pub Date : 2024-10-08DOI: 10.1016/j.optlastec.2024.111924
Ayda Aray , Saeed Ghavami Sabouri
Given the pivotal role and extensive applications of optical data routing and processing units in optical information technology, we propose a novel mechanism for switching the optical behavior of plasmonic nanoresonators within photonic integrated circuits. The key concept here is to utilize the Pockels effect not to induce a uniform change in the refractive index profile, but rather to establish an exponential refractive index profile across the nanodisk. This behavior resembles what happens in a mirage phenomenon: the light wave is unable to complete its full path around the nanodisk and is instead reflected back. The proposed plasmonic design bypasses low-transmitted signals and converts them into sharp-band reflected signals in response to a designed bias voltage. Moreover, to the best of our knowledge, our design is the first to achieve the EIT phenomenon and slow light effect using a single resonator, a significant simplification over conventional methods that typically necessitate the use of multiple resonators. This is achieved by creating interference between upward and mirage-induced downward waves, resulting in a transparency window and significant dispersion.
鉴于光数据路由和处理单元在光信息技术中的关键作用和广泛应用，我们提出了一种在光子集成电路中切换等离子纳米谐振器光学行为的新机制。这里的关键概念是利用波克尔斯效应，而不是诱导折射率曲线的均匀变化，而是在整个纳米盘上建立指数折射率曲线。这种行为类似于海市蜃楼现象：光波无法绕纳米盘走完全程，而是被反射回来。所提出的等离子设计可绕过低传输信号，并根据设计的偏置电压将其转换为尖波段反射信号。此外，据我们所知，我们的设计是首个使用单个谐振器实现 EIT 现象和慢光效应的设计，这比通常需要使用多个谐振器的传统方法大大简化。这是通过在向上波和海市蜃楼引起的向下波之间产生干扰，从而产生透明窗口和显著的色散效果来实现的。
{"title":"Plasmonic nanodisk role reversal: From a whispering gallery mode resonator to a reflective mirage","authors":"Ayda Aray , Saeed Ghavami Sabouri","doi":"10.1016/j.optlastec.2024.111924","DOIUrl":"10.1016/j.optlastec.2024.111924","url":null,"abstract":"<div><div>Given the pivotal role and extensive applications of optical data routing and processing units in optical information technology, we propose a novel mechanism for switching the optical behavior of plasmonic nanoresonators within photonic integrated circuits. The key concept here is to utilize the Pockels effect not to induce a uniform change in the refractive index profile, but rather to establish an exponential refractive index profile across the nanodisk. This behavior resembles what happens in a mirage phenomenon: the light wave is unable to complete its full path around the nanodisk and is instead reflected back. The proposed plasmonic design bypasses low-transmitted signals and converts them into sharp-band reflected signals in response to a designed bias voltage. Moreover, to the best of our knowledge, our design is the first to achieve the EIT phenomenon and slow light effect using a single resonator, a significant simplification over conventional methods that typically necessitate the use of multiple resonators. This is achieved by creating interference between upward and mirage-induced downward waves, resulting in a transparency window and significant dispersion.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111924"},"PeriodicalIF":4.6,"publicationDate":"2024-10-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142422410","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}
Pub Date : 2024-09-26DOI: 10.1016/j.optlastec.2024.111845
Xing Wang , Yadong Xu , Jiliang Liu , Quanzhen Zhang , Hongyan Yin , Can Zhang , Laurence A. Belfiore , Sui Mao , Jianguo Tang
Plasmon-induced photoacoustic streaming, considered as a potential application for micro-pumps in microfluidics, currently encounters ongoing debates concerning its fundamental mechanisms. In this study, we investigate the crucial role played by microbubbles in generation of jets in an ethanol aqueous solution. The power density threshold for bubble generation and its dependency on jet initiation are confirmed and the microbubble behavior is well regulated by manipulating the laser and liquid properties. Through simulations coupling fluidic and thermal fields, the significant role of Marangoni effect is validated in jet formation. Specifically, the temperature gradient of microbubbles is determined to be a pivotal factor in the generation of collimated jets. Additionally, factors influencing jetting, such as microbubble size and temperature gradients are studied, and noticeably, a stabilized jet lasting over 4 h is achieved based upon.
{"title":"Control of photothermal liquid jets through microbubble Regulation: Fundamental mechanisms and Developing Strategies","authors":"Xing Wang , Yadong Xu , Jiliang Liu , Quanzhen Zhang , Hongyan Yin , Can Zhang , Laurence A. Belfiore , Sui Mao , Jianguo Tang","doi":"10.1016/j.optlastec.2024.111845","DOIUrl":"10.1016/j.optlastec.2024.111845","url":null,"abstract":"<div><div>Plasmon-induced photoacoustic streaming, considered as a potential application for micro-pumps in microfluidics, currently encounters ongoing debates concerning its fundamental mechanisms. In this study, we investigate the crucial role played by microbubbles in generation of jets in an ethanol aqueous solution. The power density threshold for bubble generation and its dependency on jet initiation are confirmed and the microbubble behavior is well regulated by manipulating the laser and liquid properties. Through simulations coupling fluidic and thermal fields, the significant role of Marangoni effect is validated in jet formation. Specifically, the temperature gradient of microbubbles is determined to be a pivotal factor in the generation of collimated jets. Additionally, factors influencing jetting, such as microbubble size and temperature gradients are studied, and noticeably, a stabilized jet lasting over 4 h is achieved based upon.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"181 ","pages":"Article 111845"},"PeriodicalIF":4.6,"publicationDate":"2024-09-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142319641","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}
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