Optics and Laser Technology最新文献

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A low-light image enhancement framework based on hybrid multiscale decomposition and adaptive brightness adjustment model

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112621

Yizheng Lang, Yunsheng Qian

Under inadequate lighting conditions, low-light images often suffer from low contrast and poor visibility. However, many existing methods struggle to find a balance between detail enhancement, brightness adjustment, and noise suppression. To address these challenges, this paper proposes a hybrid multiscale decomposition and adaptive brightness adjustment model for low-light image enhancement. By combining local and global contrast enhancement techniques, an adaptive brightness adjustment algorithm is introduced to improve both the brightness and texture details. Furthermore, a hybrid multiscale decomposition model based on guided filtering and side window guided filters is designed to handle the intricate nature of image detail information, which divides the original image into three distinct layers: a base layer representing the background, a large-scale detail layer capturing prominent edge structures, and a small-scale detail layer preserving subtle texture details. To preserve key image details and enhance salient targets, fusion methods based on “exposure” functions and normalized arctan functions are employed. These methods ensure that weak details are preserved while suppressing noise artifacts. Qualitative and quantitative experimental results conducted on public datasets demonstrate that the proposed method surpasses state-of-the-art approaches in terms of detail enhancement, brightness adjustment, and noise suppression.

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引用次数: 0

Ab-Initio based investigation of the optoelectronic, transport, mechanical properties of vacancy-ordered double perovskites A2PtI6 (A = Na, Li): An emerging class of solar cell and thermoelectric materials

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-18 DOI: 10.1016/j.optlastec.2025.112609

Anjali Kumari , Jisha Annie Abraham , Abhishek Kumar Mishra , Ramesh Sharma , A.M. Alshehri

In this study, the structural, thermoelectric, mechanical, electrical, and optical properties of vacancy-ordered double perovskites A₂PtI₆ (A = Li, Na) have been investigated using density functional theory-based methods. As per the findings, both the materials are stable as confirmed by their calculated formation and cohesive energies. Each compound’s ductility and mechanical stability have been verified. The values of band-gap are computed using dissimilar exchange correlation functions PBE-GGA, mBJ, mBJ + SOC. The results show that A₂PtI₆ (A = Na, Li) are semiconducting material possessing indirect bandgaps having the values of 0.344 eV and 0.347 eVs through PBE-GGA and 0.954 eV and 1.034 eVs by mBJ approximations. After SOC corrections, the band gap values for Li₂PtI₆ and Na₂PtI₆ are found to be 0.820 eV and 0.880 eVs respectively. Similarly, the optical properties like dielectric function, reflectivity, absorption coefficient, loss functions are also computed to explore the optoelectronics applications for these compounds. We also assess the thermoelectric parameters that result in advantageous thermoelectric performance, such as power factors, Seebeck coefficients, and electronic & lattice thermal conductivities. At 1200 K, Li₂PtI₆ and Na₂PtI₆ attain maximum figure of merit (ZT) of 0.58 and 0.50, respectively. These outcomes underscore the materials’ potential for use in thermoelectric devices and solar cells, highlighting their efficacy at high temperatures.

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引用次数: 0

Electrically modulated near-field energy transfer between quantum dots and perovskite nanocrystals

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112599

Qasim Khan , Sajid Hussain , Fawad Saeed , Nasrud Din , Rai M Dawood Sultan , Sabad-e- Gul , Lei Wei , Kevin P. Musselman

Electrically controlling resonance energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Cesium lead halide nanocrystals have emerged as a candidate for optoelectronic applications, seamlessly blending the favorable advantages of perovskites and quantum dots. Here, we demonstrate nonradiative energy transfer between CsPbBr₃ nanocrystals and colloidal quantum dots in a heterostructure device. We fabricate devices with semiconducting, chemically synthesised cesium lead bromide (CsPbBr₃) perovskite nanocrystals (PerNCs) as an electrostatically gated donor and core–shell quantum dots (QDs) as an acceptor. With the help of a bottom-gate electrode and hafnium oxide (HfO₂) dielectric layer, the Förster resonance energy transfer (FRET) efficiency can be modulated. Thicknesses of the dielectric, donor, and acceptor layers were fine-tuned and the optimized device configuration exhibits up to 80% modulation of photoluminescence intensity, making it suitable for potential applications in optoelectronic devices and energy conversion.

{"title":"Electrically modulated near-field energy transfer between quantum dots and perovskite nanocrystals","authors":"Qasim Khan , Sajid Hussain , Fawad Saeed , Nasrud Din , Rai M Dawood Sultan , Sabad-e- Gul , Lei Wei , Kevin P. Musselman","doi":"10.1016/j.optlastec.2025.112599","DOIUrl":"10.1016/j.optlastec.2025.112599","url":null,"abstract":"<div><div>Electrically controlling resonance energy transfer of optical emitters provides a novel mechanism to switch nanoscale light sources on and off individually for optoelectronic applications. Cesium lead halide nanocrystals have emerged as a candidate for optoelectronic applications, seamlessly blending the favorable advantages of perovskites and quantum dots. Here, we demonstrate nonradiative energy transfer between CsPbBr<sub>3</sub> <!-->nanocrystals and colloidal quantum dots in a heterostructure device. We fabricate devices with semiconducting, chemically synthesised cesium lead bromide (CsPbBr<sub>3</sub>) perovskite nanocrystals (PerNCs) as an electrostatically gated donor and core–shell quantum dots (QDs) as an acceptor. With the help of a bottom-gate electrode and hafnium oxide (HfO<sub>2</sub>) dielectric layer, the Förster resonance energy transfer (FRET) efficiency can be modulated. Thicknesses of the dielectric, donor, and acceptor layers were fine-tuned and the optimized device configuration exhibits up to 80% modulation of photoluminescence intensity, making it suitable for potential applications in optoelectronic devices and energy conversion.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112599"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422601","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}

引用次数: 0

Ultra-broadband mid-infrared absorption based on photonic topological transition and anti-reflection effect 基于光子拓扑转变和抗反射效应的超宽带中红外吸收技术

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112607

Haojie Zhang , Xiaotian Chen , Shijia Dong , Bingxue Ye , Ruijia Yang , Yan-Lin Liao , Zhenggen Chen , Yan Zhao

We have developed and experimentally validated an ultra-broadband mid-infrared absorber comprising a periodic Ge/Cr multilayer structure coated with MgF₂ and ZnS films. Simulation studies demonstrate that the absorber’s performance remains robust across different polarizations and angles of incidence. The mechanism behind its ultra-broadband absorption capability stems from the synergistic effects of photonic topological transitions (PTT) and anti-reflection (AR) properties. Experimental results confirm that this absorber achieves an absorptivity exceeding 0.85 across a wide wavelength range from 2000 to 8410 nm. This innovative absorber not only broadens the scope of absorption bandwidths in the mid-infrared region but also holds significant promise for applications in thermal energy harvesting, thermal imaging, and radiation cooling.

引用次数: 0

Improving image quality in holographic near-eye display for variable eye pupil positions and sizes

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112596

Yue Wang , Yuan Liu , Yumeng Su , Qibin Feng , Guoqiang Lv , Zi Wang

In holographic near-eye display, the dynamic changes in the pupil results in the partial and incomplete sampling of the diffracted light wavefront. This paper investigate the influences of pupil position change and size variation based on multiple pupil sub-hologram optimization method. The low reconstruction quality of edge sub-hologram is analyzed and solved by increasing the sampling frequency in the frequency domain. Furthermore, a optimization method based on varying pupil masks is proposed to improve the quality of the observed image when pupil size varies. Simulation and experiment verify that the proposed method effectively improves image quality under varying eye pupil samplings.

引用次数: 0

The influence of different water-assisted methods on femtosecond laser layered- ring trepanning in silicon nitride ceramics

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112605

Naifei Ren , Song Yao , Zhen Wu , Yuanjie Zheng , Jianke Di , Liang Wang , Kaibo Xia

In this work, the effects of in air, water-based assistance, and underwater assistance on the quality of infrared femtosecond laser layered-ring trepanning on silicon nitride ceramics were compared, and the effects of laser pulse energy on the hole entrance/exit diameter, taper angle, hole sidewall morphology and hole sidewall roughness were analyzed. The femtosecond laser is a solid-state laser with wavelength of 1030 nm, focus spot diameter of 21 μm, beam parameter product of 0.380 mm·mrad and focus depth of 568 μm. The results show that both water-based assistance and underwater assistance can improve the quality of femtosecond laser layered-ring trepanning. Compared with in air, the hole entrance diameter was increased by 14.4 %, the hole exit diameter was increased by 323.4 %, the taper angle was reduced by 75.0 %, the hole sidewall roughness was reduced by 53.8 %, and the hole entrance sidewall roughness was reduced by 83.7 % with water-based assistance; the hole entrance diameter was increased by 16.9 %, the hole exit diameter was increased by 329.5 %, the taper angle was reduced by 72.7 %, and the hole sidewall roughness was reduced by 59.3 %, and the hole entrance sidewall roughness was reduced by 86.1 % with underwater assistance. Compared with water-based assistance, underwater assisted laser drilling had a slightly larger hole entrance diameter and a similar exit diameter. The taper angle with underwater assistance was slightly larger than that with water-based assistance. The roughness of the entrance and middle sidewall with underwater assistance was slightly lower than that with water-based assistance, while the roughness of the exit sidewall was basically the same. The sidewall morphology of the two water assisted methods was basically the same, with no significant changes. The experimental results provided valuable references for further optimizing the water-assisted femtosecond laser drilling.

{"title":"The influence of different water-assisted methods on femtosecond laser layered- ring trepanning in silicon nitride ceramics","authors":"Naifei Ren , Song Yao , Zhen Wu , Yuanjie Zheng , Jianke Di , Liang Wang , Kaibo Xia","doi":"10.1016/j.optlastec.2025.112605","DOIUrl":"10.1016/j.optlastec.2025.112605","url":null,"abstract":"<div><div>In this work, the effects of in air, water-based assistance, and underwater assistance on the quality of infrared femtosecond laser layered-ring trepanning on silicon nitride ceramics were compared, and the effects of laser pulse energy on the hole entrance/exit diameter, taper angle, hole sidewall morphology and hole sidewall roughness were analyzed. The femtosecond laser is a solid-state laser with wavelength of 1030 nm, focus spot diameter of 21 μm, beam parameter product of 0.380 mm·mrad and focus depth of 568 μm. The results show that both water-based assistance and underwater assistance can improve the quality of femtosecond laser layered-ring trepanning. Compared with in air, the hole entrance diameter was increased by 14.4 %, the hole exit diameter was increased by 323.4 %, the taper angle was reduced by 75.0 %, the hole sidewall roughness was reduced by 53.8 %, and the hole entrance sidewall roughness was reduced by 83.7 % with water-based assistance; the hole entrance diameter was increased by 16.9 %, the hole exit diameter was increased by 329.5 %, the taper angle was reduced by 72.7 %, and the hole sidewall roughness was reduced by 59.3 %, and the hole entrance sidewall roughness was reduced by 86.1 % with underwater assistance. Compared with water-based assistance, underwater assisted laser drilling had a slightly larger hole entrance diameter and a similar exit diameter. The taper angle with underwater assistance was slightly larger than that with water-based assistance. The roughness of the entrance and middle sidewall with underwater assistance was slightly lower than that with water-based assistance, while the roughness of the exit sidewall was basically the same. The sidewall morphology of the two water assisted methods was basically the same, with no significant changes. The experimental results provided valuable references for further optimizing the water-assisted femtosecond laser drilling.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112605"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422544","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

Intelligent soliton mode-locked laser based on multi-core fiber

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112588

Boyao Li , Shichao Sun , Yaoyao Liang , Jinghua Sun , Xiaojie Zuo , Zhiyi Wei

Soliton pulses, as stable optical phenomena, have been extensively studied due to their generation processes resembling the nonlinear dynamics of complex motions in matter particles. To establish a stable multidimensional platform for the spatiotemporal interaction of solitons, we propose a mode-locked laser incorporating a four-core fiber and an intelligent control system. Leveraging the multi-channel structure of the multi-core fiber, traditional solitons can propagate and interact within a multidimensional spatial domain, enabling the formation of various mode-locking configurations. Additionally, we introduce a dual-mode algorithm (DMDL) that integrates long short-term memory (LSTM) networks into the deep deterministic policy gradient (DDPG) over entire framework to enhance the system’s response speed and accuracy. Experimental results demonstrate that the system can switch from traditional soliton pulses to multi-octave (harmonic) soliton pulses. Furthermore, the intelligent control system facilitates joint spatiotemporal control and identification of the multidimensional soliton laser system across multiple domains, including time and frequency. These findings would be fruitful for the communities interested in nonlinear soliton dynamics, precision measurement, frequency comb lasers, and related fields.

{"title":"Intelligent soliton mode-locked laser based on multi-core fiber","authors":"Boyao Li , Shichao Sun , Yaoyao Liang , Jinghua Sun , Xiaojie Zuo , Zhiyi Wei","doi":"10.1016/j.optlastec.2025.112588","DOIUrl":"10.1016/j.optlastec.2025.112588","url":null,"abstract":"<div><div>Soliton pulses, as stable optical phenomena, have been extensively studied due to their generation processes resembling the nonlinear dynamics of complex motions in matter particles. To establish a stable multidimensional platform for the spatiotemporal interaction of solitons, we propose a mode-locked laser incorporating a four-core fiber and an intelligent control system. Leveraging the multi-channel structure of the multi-core fiber, traditional solitons can propagate and interact within a multidimensional spatial domain, enabling the formation of various mode-locking configurations. Additionally, we introduce a dual-mode algorithm (DMDL) that integrates long short-term memory (LSTM) networks into the deep deterministic policy gradient (DDPG) over entire framework to enhance the system’s response speed and accuracy. Experimental results demonstrate that the system can switch from traditional soliton pulses to multi-octave (harmonic) soliton pulses. Furthermore, the intelligent control system facilitates joint spatiotemporal control and identification of the multidimensional soliton laser system across multiple domains, including time and frequency. These findings would be fruitful for the communities interested in nonlinear soliton dynamics, precision measurement, frequency comb lasers, and related fields.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112588"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143422526","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

Investigation on large modulation bandwidth InGaN-based blue laser diodes 基于 InGaN 的大调制带宽蓝色激光二极管研究

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112601

Junhui Hu , Haolin Jia , Zhenqian Gu , Zhen Yang , Shaohua Yu , Changsheng Xia , Junwen Zhang , Ziwei Li , Yingjun Zhou , Jianyang Shi , Nan Chi , Chao Shen

The modulation performance of c-plane blue indium gallium nitride (InGaN) based laser diode (LD) is investigated. Various design parameters, including the waveguide layer, active region, and cavity length, has been studied to reveal the carrier-photon interactions and its impact on the dynamic characteristics and high-speed performance of the laser. The results indicate that a 50 nm InGaN waveguide layer, an active region with 3 pairs of 2–3 nm quantum well/ 5–7 nm quantum barrier, and a short cavity length of 200 um, yield the best modulation performance. A low damping factor of 0.12 ns and a bandwidth exceeding 10 GHz at the optical power of 30 mW can be achieved. The results provide a practical guidance for designing high-speed blue LDs, paving the path for the realization of large bit rate visible light data links.

引用次数: 0

Polarization-transverse-spatial logical qubit entanglement purification using linear optics 利用线性光学净化偏振-横向-空间逻辑量子比特纠缠

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112566

Peng-Liang Guo , Cheng-Yan Gao , Bao-Cang Ren

We propose two types of logical qubit entanglement purification protocols (LEPPs) to reduce the effect of noises inside and outside the logical qubit subspace using linear optics, where logical qubit is encoded by single-photon polarization-transverse-spatial Bell state. For the noise outside of the logical qubit subspace, deterministic LEPP is presented to determine and correct the error-entangled state using error correction of the single-photon Bell state, resulting in the logical entangled state with unity fidelity. For the noise inside of the logical qubit subspace, probabilistic LEPP is presented to progressively increase the fidelity of the noisy logical entangled state using the parity and diagonal-basis measurements for the logical qubit. These two types of LEPPs have experimental feasibility with current technology, and the quantum operations of logical qubits in these protocols have fantastic applications in some other logical-encoding quantum information protocols.

引用次数: 0

Investigation on the effect of transverse phase error in tiled-array based coherent beam combining

IF 4.6 2区物理与天体物理 Q1 OPTICS

Optics and Laser Technology

Pub Date : 2025-02-17 DOI: 10.1016/j.optlastec.2025.112429

Satyajit Maji, Viswanathan Sankar, M.S. Sooraj, C.L. Linslal, Anirudh Bharadwaj, Balaji Srinivasan

Coherent combining of an array of laser beams through a tiled aperture configuration is an effective method for scaling the far-field intensity. However, several parameters including the array fill factor, longitudinal as well as transverse phase errors, and mismatch in beam quality limit the maximum achievable beam combination efficiency in the far field. Optimizing such parameters and mitigating the effect of phase errors requires in-depth investigation of the tiled array beam combining system. We numerically analyze the performance of such a system in the presence of all the above errors using the band-limited angular spectrum method of field propagation, while employing the Stochastic Parallel Gradient Descent (SPGD) technique to synchronize the phase of the constituent elements. Based on simulations, we find that the fill factor of the array and the pointing error of the constituent beams are the major factors that degrade the beam combining efficiency and we quantify the degradation due to such factors. The simulation results are validated using a 7-channel tiled aperture beam combining experimental setup with a provision of tip-tilt adjustment for the individual beams.

{"title":"Investigation on the effect of transverse phase error in tiled-array based coherent beam combining","authors":"Satyajit Maji, Viswanathan Sankar, M.S. Sooraj, C.L. Linslal, Anirudh Bharadwaj, Balaji Srinivasan","doi":"10.1016/j.optlastec.2025.112429","DOIUrl":"10.1016/j.optlastec.2025.112429","url":null,"abstract":"<div><div>Coherent combining of an array of laser beams through a tiled aperture configuration is an effective method for scaling the far-field intensity. However, several parameters including the array fill factor, longitudinal as well as transverse phase errors, and mismatch in beam quality limit the maximum achievable beam combination efficiency in the far field. Optimizing such parameters and mitigating the effect of phase errors requires in-depth investigation of the tiled array beam combining system. We numerically analyze the performance of such a system in the presence of all the above errors using the band-limited angular spectrum method of field propagation, while employing the Stochastic Parallel Gradient Descent (SPGD) technique to synchronize the phase of the constituent elements. Based on simulations, we find that the fill factor of the array and the pointing error of the constituent beams are the major factors that degrade the beam combining efficiency and we quantify the degradation due to such factors. The simulation results are validated using a 7-channel tiled aperture beam combining experimental setup with a provision of tip-tilt adjustment for the individual beams.</div></div>","PeriodicalId":19511,"journal":{"name":"Optics and Laser Technology","volume":"185 ","pages":"Article 112429"},"PeriodicalIF":4.6,"publicationDate":"2025-02-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143428039","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

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