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Micro-ring resonator assisted spiking neural network for efficient object detection. 微环谐振辅助脉冲神经网络的高效目标检测。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.564419
Jianping Chang, Gaoshuai Wang, Zongqing Lu, Zihan Geng
{"title":"Micro-ring resonator assisted spiking neural network for efficient object detection.","authors":"Jianping Chang, Gaoshuai Wang, Zongqing Lu, Zihan Geng","doi":"10.1364/OL.564419","DOIUrl":"https://doi.org/10.1364/OL.564419","url":null,"abstract":"<p><p>Optical computing and spiking neural networks (SNNs) have garnered significant attention as next-generation technologies due to their high parallelism and low-energy consumption. However, the current implementations for realizing spiking neurons of photonic neuromorphic computing mainly rely on active devices or nonlinear effects, which pose challenges for large-scale integration and energy conservation. Moreover, most existing optical SNN applications have been limited to simple image classification tasks. To address these limitations, we propose an optical-assisted SNN model based on the passive add-drop micro-ring resonator (ADMRR), which simulates the membrane potential accumulation in spiking neurons through optical temporal integration. System-level object detection is conducted numerically by the spiking version of the modified YOLO algorithm with ADMRR-based neurons. The results show that the proposed photonic SNN achieves performance exceeding 98% of that attained by computer-based SNN on the PASCAL VOC dataset, which contains 11,530 images across 20 object categories. Our work offers advantages including simplicity, enhanced parallelism, ease of large-scale integration, and effective emulation of neuronal leakage and integration dynamics, paving the way for the widespread use of photonic SNNs in more complex image processing tasks.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4002-4005"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289557","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
Polarimetric coherent anti-Stokes Raman scattering microscopy of collagen. 胶原蛋白的偏振相干抗斯托克斯拉曼散射显微镜。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.557999
Lingxiao Yang, Janet E Sorrells, Rishyashring R Iyer, Stephen A Boppart
{"title":"Polarimetric coherent anti-Stokes Raman scattering microscopy of collagen.","authors":"Lingxiao Yang, Janet E Sorrells, Rishyashring R Iyer, Stephen A Boppart","doi":"10.1364/OL.557999","DOIUrl":"https://doi.org/10.1364/OL.557999","url":null,"abstract":"<p><p>We demonstrate polarimetric coherent anti-Stokes Raman scattering (PCARS) microscopy for quantitative analysis of collagen orientation. Using polarization-modulated excitation and cross-polarized detection, we extract both chemical and orientational information from intact tissues. We introduce two complementary analyses: the CARS peak polarization ratio (PPR) and Fourier domain polarimetric analysis, providing a robust characterization of collagen organization. This method enables rapid, label-free imaging of a collagen structure with molecular specificity, offering what we believe to be new capabilities for studying collagen remodeling in biological processes.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4010-4013"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289570","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
Angular diversity illumination method for effective suppression of speckle decorrelation noise in speckle interferometry. 角分集照明方法在散斑干涉中有效抑制散斑去相关噪声。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.565553
Xiangwei Liu, Mohan Ding, Peizheng Yan, Yonghong Wang
{"title":"Angular diversity illumination method for effective suppression of speckle decorrelation noise in speckle interferometry.","authors":"Xiangwei Liu, Mohan Ding, Peizheng Yan, Yonghong Wang","doi":"10.1364/OL.565553","DOIUrl":"https://doi.org/10.1364/OL.565553","url":null,"abstract":"<p><p>Speckle decorrelation noise significantly reduces the quality of phase fringe patterns in speckle interferometry. Conventional filtering methods often involve a trade-off between noise suppression and computational efficiency. To address this limitation, we propose a speckle noise suppression approach based on angular diversity in illumination. A spatial light modulator (SLM) is employed to precisely and repeatably modulate the illumination angle while simultaneously enabling temporal phase shifting. Multiple uncorrelated speckle fields are acquired and coherently averaged to reduce noise. Theoretical analysis shows that the standard deviation of the speckle noise scales inversely with the square root of the number of averages 1/<i>N</i>. The experimental results validate the theoretical predictions and demonstrate that the proposed method significantly suppresses speckle decorrelation noise, improving the practical performance of speckle interferometry.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4058-4061"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289496","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
Cavity ring-down spectroscopy at 2-μm wavelength assisted by a comb-locked optical parametric oscillator. 梳锁光学参量振荡器辅助下的2 μm波长腔衰荡光谱。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.563855
Vittorio D'Agostino, Eugenio Fasci, Muhammad Asad Khan, Stefania Gravina, Livio Gianfrani, Antonio Castrillo
{"title":"Cavity ring-down spectroscopy at 2-μm wavelength assisted by a comb-locked optical parametric oscillator.","authors":"Vittorio D'Agostino, Eugenio Fasci, Muhammad Asad Khan, Stefania Gravina, Livio Gianfrani, Antonio Castrillo","doi":"10.1364/OL.563855","DOIUrl":"https://doi.org/10.1364/OL.563855","url":null,"abstract":"<p><p>We report on a comb-locked cavity ring-down spectrometer developed for high-precision molecular spectroscopy at 2 μm. It is based on the use of an external-cavity diode laser that is offset-frequency locked to the signal output of a singly-resonant optical parametric oscillator. This latter acts as a reference laser, being locked to a self-referenced optical frequency comb, which in turn is stabilized against a GPS-disciplined Rb-clock. The performance of the spectrometer is investigated by probing a pair of N<sub>2</sub>O transitions belonging to hot vibrational bands. One of these has never, to the best of our knowledge, been observed before, and is included in the N<sub>2</sub>O line list of the ExoMol database. Absolute center frequencies are retrieved with a 1-<i>σ</i> global uncertainty of 108 kHz.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4078-4081"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289500","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
Dynamic monitoring of few-mode long-period fiber gratings using swept-wavelength interferometry. 用扫描波长干涉法动态监测低模长周期光纤光栅。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.566246
Huihui Wang, Bingyi Zhao, Yuehui Ma, Miaomiao Tang, Xutao Wang, Zongcheng Zhang, Zhiqun Yang, Yaping Liu, Zhanhua Huang, Yunqi Liu, Lin Zhang
{"title":"Dynamic monitoring of few-mode long-period fiber gratings using swept-wavelength interferometry.","authors":"Huihui Wang, Bingyi Zhao, Yuehui Ma, Miaomiao Tang, Xutao Wang, Zongcheng Zhang, Zhiqun Yang, Yaping Liu, Zhanhua Huang, Yunqi Liu, Lin Zhang","doi":"10.1364/OL.566246","DOIUrl":"https://doi.org/10.1364/OL.566246","url":null,"abstract":"<p><p>We present the dynamic monitoring of long-period fiber gratings (LPFGs) using swept-wavelength interferometry (SWI) for the first time, to our knowledge, including both grating fabrication and its environmental responses. One type of LPFGs designed for mode conversion is fabricated by applying pressure to a few-mode fiber. SWI tests provide mode-dependent losses (MDLs), insertion losses (ILs), and mode conversion efficiencies (MCEs) of the LPFG across the C-band. The LPFG exhibits a maximum MCE of 80.73% at 1550 nm, with an MDL of 0.08 dB and an IL of 0.62 dB. This approach enables the high-quality fabrication of LPFGs and is applicable to various fabrication techniques. Also, dynamic thermal responses of LPFGs are monitored using SWI, which reveals a highly linear relationship (R<sup>2</sup> = 0.99) between mode cross talk (XT) and temperature, providing a new approach for LPFG-based temperature sensing.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3954-3957"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289512","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
Enhancing excited-state lifetimes in Er3+-doped silica glass through controlled heat exposure. 通过控制热暴露提高Er3+掺杂二氧化硅玻璃的激发态寿命。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.562095
Tim Julian Wörmann, Martin Brunzell, Valdas Pasiskevicius, Pawel Maniewski
{"title":"Enhancing excited-state lifetimes in Er<sup>3+</sup>-doped silica glass through controlled heat exposure.","authors":"Tim Julian Wörmann, Martin Brunzell, Valdas Pasiskevicius, Pawel Maniewski","doi":"10.1364/OL.562095","DOIUrl":"https://doi.org/10.1364/OL.562095","url":null,"abstract":"<p><p>Optimization of rare-earth (RE) doped devices for laser applications necessitates a combination of precision material engineering and advanced performance enhancement strategies. This study presents a novel investigation, to our knowledge, into cluster dynamics in Er-doped glass, utilizing localized CO<sub>2</sub> laser heating to simulate the high-temperature conditions typical of glass fabrication processes. Our findings demonstrate that, by a controlled heat exposure, it is possible to influence clustering in Er-doped glass. Minimized clustering leads to a significant improvement in material properties and ultimately device performance. Specifically, we achieved up to 25% increase in the radiative lifetime associated with the <sup>4</sup>I<sub>13/2</sub> → <sup>4</sup>I<sub>15/2</sub> radiative transition by exposing samples to elevated temperatures for several minutes. This rapid thermal treatment minimizes dopant mobility in sintered silica glass, thereby reducing cluster formation and improving the homogeneity of the active medium. These results provide a feasible pathway for enhancing the performance of erbium-based optical devices, including lasers and signal amplifiers, and underscore the potential of thermal processing as a versatile tool in photonic material optimization.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3848-3851"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289516","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
Landau rainbow based on Floquet helical waveguide systems. 朗道彩虹基于Floquet螺旋波导系统。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.563395
Rong Zhou, Zhihao Wang, Wenshuo Ma, Wen Zhao, Yongchun Liu, Cuicui Lu
{"title":"Landau rainbow based on Floquet helical waveguide systems.","authors":"Rong Zhou, Zhihao Wang, Wenshuo Ma, Wen Zhao, Yongchun Liu, Cuicui Lu","doi":"10.1364/OL.563395","DOIUrl":"https://doi.org/10.1364/OL.563395","url":null,"abstract":"<p><p>A topological rainbow can separate topological photonic states with different frequencies to different spatial localizations. The Landau levels offer significant insights for the study of topological bulk states and inspire the discovery of novel topological states and phenomena. The Landau rainbow, as a typical topological rainbow, in which different frequencies of Landau modes can be separated into different positions, exhibits potential applications for designing broadband photonic devices. In this Letter, we propose a Landau rainbow based on the zero-order Landau level of Floquet helical waveguide systems for the first time to our knowledge. The photonic Landau levels are induced by a pseudo-magnetic field by engineering the gradient effective coupling strength, and the helical configuration of the waveguides breaks the degeneracy of the zero-order Landau levels resulting in band tilting. Therefore, the states in the zero-order Landau level exhibit distinct quasienergies and are located at different spatial positions, which show a Landau rainbow effect. The Landau rainbow based on Floquet helical waveguide systems provides new avenues for the realization of robust photonic devices, such as rainbow trapping device, multifrequency divider, and optical information storage.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3990-3993"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289555","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
Optimization of time and frequency allocations in a TFDMA PON with diverse user conditions and diversified rate targets. 多用户条件和多速率目标下TFDMA PON时频分配优化
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.558972
Jie Luan, Xi Chen, Di Che
{"title":"Optimization of time and frequency allocations in a TFDMA PON with diverse user conditions and diversified rate targets.","authors":"Jie Luan, Xi Chen, Di Che","doi":"10.1364/OL.558972","DOIUrl":"https://doi.org/10.1364/OL.558972","url":null,"abstract":"<p><p>Active research is being conducted for beyond-100G passive optical networks (PONs) to cover contemporary society's ever-increasing information rate demand. In this context, time-frequency-division multiple access (TFDMA) PON can potentially extend the coverage of the current time-division multiple access (TDMA) scheme in a diversified user network. In this Letter, we study the time and frequency allocations in a TFDMA PON based on digital subcarrier multiplexing (DSCM), where the users' channels exhibit frequency-dependent performance and disparity. We also consider the possibility that the users target different information rates. We provide a formal proof that the TFDMA approach yields a diversity gain over the traditional TDMA scheme and verify the effectiveness of our allocation method by calculating the diversity gain for a 200G-class intensity-modulation direct-detection (IM-DD) system.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3911-3914"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289565","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
Orbital polarization in harmonic light beams. 谐波光束中的轨道偏振。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.564386
Jyrki Laatikainen, Olga Korotkova
{"title":"Orbital polarization in harmonic light beams.","authors":"Jyrki Laatikainen, Olga Korotkova","doi":"10.1364/OL.564386","DOIUrl":"https://doi.org/10.1364/OL.564386","url":null,"abstract":"<p><p>A harmonic electromagnetic beam oscillating at an arbitrary number, say <i>L</i>, of orbital angular momentum (OAM) states and having any polarization properties is shown to be characterized by means of a <i>L</i> × 2 tensor. The projection of the tensor to the polarization plane is found to contain information about the OAM-state mixing and radially resolved polarization of the beam. In particular, the degree of orbital polarization and the orbital polarization ellipse are introduced.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"3998-4001"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289566","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
Sample motion for structured illumination fluorescence microscopy. 结构照明荧光显微镜的样品运动。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-15 DOI: 10.1364/OL.560873
Ruiming Cao, Guanghan Meng, Laura Waller
{"title":"Sample motion for structured illumination fluorescence microscopy.","authors":"Ruiming Cao, Guanghan Meng, Laura Waller","doi":"10.1364/OL.560873","DOIUrl":"https://doi.org/10.1364/OL.560873","url":null,"abstract":"<p><p>Structured illumination microscopy (SIM) uses a set of images captured with different illumination patterns to computationally reconstruct resolution beyond the diffraction limit. Here, we propose an alternative approach using a single speckle illumination pattern and relying on inherent sample motion to encode the super-resolved information in multiple raw images. From a set of raw fluorescence images captured as the sample moves, we jointly estimate both the sample motion and the super-resolved image. We demonstrate the feasibility of the proposed method both in simulation and in experiment.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 12","pages":"4074-4077"},"PeriodicalIF":3.1,"publicationDate":"2025-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144289574","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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