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Low-loss ultra-large mode area all-solid chalcogenide photonic crystal fiber for 20 W level mid-infrared laser delivery. 用于20w级中红外激光传输的低损耗超大模区全固体硫系光子晶体光纤。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.557304
Chong Wang, Tiankai Hou, Yantao Xu, Yanjie Chang, Hao Zhang, Haitao Guo
{"title":"Low-loss ultra-large mode area all-solid chalcogenide photonic crystal fiber for 20 W level mid-infrared laser delivery.","authors":"Chong Wang, Tiankai Hou, Yantao Xu, Yanjie Chang, Hao Zhang, Haitao Guo","doi":"10.1364/OL.557304","DOIUrl":"https://doi.org/10.1364/OL.557304","url":null,"abstract":"<p><p>To achieve mid-infrared high-power laser delivery, a single-mode large mode area (∼9900 µm<sup>2</sup>) all-solid photonic crystal fiber (AS-PCF) based on As<sub>2</sub>Se<sub>3</sub> and As<sub>2</sub>S<sub>3</sub> chalcogenide glasses was designed. The finite element method was used to study the influence of structural parameters on the optical properties of the fiber. The AS-PCF was fabricated by the stacking-drawing method after material purification, and the optical loss, the near-field mode distributions, and the high-power laser transmission were measured. The fiber exhibits a minimum loss of 4.62 dB/m, which is the lowest loss among chalcogenide AS-PCF on record, and it can carry at least 20 W of high-power transmission, demonstrating strong potential for mid-infrared laser delivery applications.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3696-3699"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187512","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
Photonic real-time Fourier transform via optical phase conjugation. 基于光学相位共轭的光子实时傅里叶变换。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.562278
Yi Wang, Shuna Yang, Bo Yang, Yiran Gao, Hao Chi
{"title":"Photonic real-time Fourier transform via optical phase conjugation.","authors":"Yi Wang, Shuna Yang, Bo Yang, Yiran Gao, Hao Chi","doi":"10.1364/OL.562278","DOIUrl":"https://doi.org/10.1364/OL.562278","url":null,"abstract":"<p><p>We propose a novel approach, to our knowledge, for implementing photonic real-time Fourier transform (RTFT) based on optical phase conjugation, which enables the spectral content of an input microwave signal to be mapped onto the time-domain waveform of output pulses. In the approach, the phase-conjugated signal is generated via four-wave mixing in a semiconductor optical amplifier, and frequency-to-time mapping is performed using two identical dispersive elements (DEs). This configuration effectively maps the spectrum of the input microwave signal to the output time-domain waveform, removing the requirement for DEs with opposite dispersion signs, which are typically required in conventional RTFT systems. The feasibility of this RTFT approach for microwave frequency measurement is validated through an experiment utilizing modulated pulses, phase conjugation, and two identical DEs, with the frequency resolution reaching the theoretical limit determined by the electrical bandwidth and the dispersion amount of the system.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3632-3635"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187525","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
3D micro-printed polymer limacon-shaped whispering-gallery-mode microlaser sensors for label-free biodetection. 用于无标签生物检测的3D微打印聚合物limagon形低语走廊模式微激光传感器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.557384
Zhizheng Wang, Mohsin Raza, Bin Zhou, Nan Wang, Kummara Venkata Krishnaiah, Yuwen Qin, A Ping Zhang
{"title":"3D micro-printed polymer limacon-shaped whispering-gallery-mode microlaser sensors for label-free biodetection.","authors":"Zhizheng Wang, Mohsin Raza, Bin Zhou, Nan Wang, Kummara Venkata Krishnaiah, Yuwen Qin, A Ping Zhang","doi":"10.1364/OL.557384","DOIUrl":"https://doi.org/10.1364/OL.557384","url":null,"abstract":"<p><p>Optical whispering-gallery-mode (WGM) microlaser sensors have garnered significant attention in biological sensing due to their distinct advantages, including strong light-matter interactions and versatile sensing modalities. However, challenges remain in developing WGM microlaser sensors that can serve as building blocks for large-scale integrated sensor platforms in lab-on-chip applications. In this work, we present a 3D micro-printed polymer limacon-shaped WGM microlaser sensor for on-chip integrated biosensing. The WGM microlaser sensor has both high-quality factor (<i>Q</i> factor) and directional emission properties, making it ideal for high-sensitive on-chip biosensing platforms using a far-field coupling scheme. Experimental results showed that the 3D micro-printed WGM laser sensor has a very low lasing threshold of 3.87 µJ/mm<sup>2</sup> and a narrow lasing linewidth of about 30 pm. Remarkably, experiments have shown that the sensor can detect human IgG with a detection limit of around 70 ag/mL, revealing its potential for ultralow-limit detection of biomarkers in early disease diagnosis.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3481-3484"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187466","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
Bandwidth-enhanced LFM signal generation by period-one dynamics in a directly modulated semiconductor laser. 直接调制半导体激光器中一周期动态产生带宽增强LFM信号。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.559656
Gengze Wu, Fangzheng Zhang, Xiaoyue Yu, Xin Yan, Hao Wang, Yuan Yu, Shilong Pan
{"title":"Bandwidth-enhanced LFM signal generation by period-one dynamics in a directly modulated semiconductor laser.","authors":"Gengze Wu, Fangzheng Zhang, Xiaoyue Yu, Xin Yan, Hao Wang, Yuan Yu, Shilong Pan","doi":"10.1364/OL.559656","DOIUrl":"https://doi.org/10.1364/OL.559656","url":null,"abstract":"<p><p>Period-one (P1) laser dynamics provide effective methods for radar signal generation. However, the linearly frequency-modulated (LFM) signal bandwidth generated by P1 dynamics is constrained by the limited variation range of the injection strength. In this Letter, a bandwidth-enhanced LFM signal generation method by P1 dynamics in an optically injected directly modulated semiconductor laser (DM-SL) is proposed. In addition to controlling the injection strength via electro-optical modulation, which is the same as the previous schemes, the bias current of the DM-SL is regulated via direct modulation. By interaction between the carrier effect and temperature effect in the optically injected DM-SL, the P1 oscillation frequency is increased under the same optical injection strength, leading to the generation of LFM signals with enlarged bandwidth. In the experiment, the maximum signal bandwidth reaches 21 GHz (11.7-32.7 GHz), which is enhanced by 11 GHz compared with that generated without bias current regulation. The proposed method is a promising technique for ultra-wideband radar signal generators.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3572-3575"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187470","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
Boric acid additive strategy for improving the performance of carbon dot-based light-emitting diodes. 提高碳点基发光二极管性能的硼酸添加剂策略。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.561695
Zhenzhen Yu, Xiaoming Li, Min Li, Jinxing Zhao, Peng Wang, Dawei Wang, Jinxin Zhao, Li Guan, Xu Li
{"title":"Boric acid additive strategy for improving the performance of carbon dot-based light-emitting diodes.","authors":"Zhenzhen Yu, Xiaoming Li, Min Li, Jinxing Zhao, Peng Wang, Dawei Wang, Jinxin Zhao, Li Guan, Xu Li","doi":"10.1364/OL.561695","DOIUrl":"https://doi.org/10.1364/OL.561695","url":null,"abstract":"<p><p>Carbon dots (CD)-based light-emitting diodes (LEDs) with low cost, easy acquisition, and environmental friendliness are an emerging display technology worth further exploration. However, it is still a challenge to prepare CD-based LEDs with high performance and spectral modulation. In this study, green-emitting CDs (G-CDs) were prepared into LEDs by the traditional solution method. These G-CD-based LEDs reach maximum brightness and external quantum efficiency of 400 cd/m<sup>2</sup> and 0.02%, respectively. By further introducing boric acid into G-CDs, yellow emitting carbon dots (Y-CDs) were successfully prepared. This additive engineering achieves spectral modulation, and the maximum brightness and external quantum efficiency are close to 2 times and 3 times that of the control device. This study shows the potential of boric acid in optimizing the performance of CD-based LEDs.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3712-3715"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187471","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
Differentiable optimization of multiple freeform lenses for high-performance tilted illumination. 用于高性能倾斜照明的多个自由曲面透镜的可微优化。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.561917
Haisong Tang, Zexin Feng, Yi Luo, Xianglong Mao
{"title":"Differentiable optimization of multiple freeform lenses for high-performance tilted illumination.","authors":"Haisong Tang, Zexin Feng, Yi Luo, Xianglong Mao","doi":"10.1364/OL.561917","DOIUrl":"https://doi.org/10.1364/OL.561917","url":null,"abstract":"<p><p>We present an optimization framework for designing multiple freeform lenses to achieve high-performance oblique illumination. The optimization process involves two steps: optimizing the irradiance distribution on an intermediate plane and fine-tuning the surface parameters to achieve the desired tilted target irradiance distribution. The framework could be used to design freeform illumination systems with an arbitrary number of lenses without significantly increasing the computational resource requirements. Leveraging differentiable ray tracing (DRT), we design a compact system with double freeform lenses, realizing a high tilt angle (TA) of 78.86<sup>∘</sup> and an average spacing-to-height ratio (SHR) of 3.77. It holds significant potential for applications in the design of vehicle headlights, industrial vision inspection, and decoration lighting.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3505-3508"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187484","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
Discontinuous wavelength-scanning interferometry with an unknown gapped spectrum. 具有未知间隙光谱的不连续波长扫描干涉测量。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.554121
Yulei Bai, Hao Qiu, Zean Huang, Zhaoshui He, Shengli Xie, Bo Dong
{"title":"Discontinuous wavelength-scanning interferometry with an unknown gapped spectrum.","authors":"Yulei Bai, Hao Qiu, Zean Huang, Zhaoshui He, Shengli Xie, Bo Dong","doi":"10.1364/OL.554121","DOIUrl":"https://doi.org/10.1364/OL.554121","url":null,"abstract":"<p><p>Depth-resolved wavelength-scanning interferometry (DRWSI) has emerged as a powerful topographic technique for simultaneously measuring multiple surfaces. Conventional DRWSI requires the laser to emit a continuous spectrum; however, ensuring this condition is often challenging. This Letter presents a discontinuous DRWSI measurement approach that can automatically predict the missing intensity within the gapped spectrum without requiring any prior knowledge. Therefore, the phase jitters caused by the discontinuities in wavelength scanning can be effectively removed, enabling high-quality reconstruction of the depth-resolved phase maps. Simulation demonstrated that the proposed approach can accurately restore the phase map even when the gap interval is 10 times larger than the entire wavelength-scanning range. Experimental results confirm the robustness of this approach for discontinuous DRWSI measurements under mode-hopping laser outputs. The contribution of this work can alleviate the stringent requirements for the diode laser output, enhancing the flexibility and practicality of DRWSI measurements.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3537-3540"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187486","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
Dual-pulse phase-OTDR-based distributed optic-fiber acoustic sensor with active laser frequency compensation. 基于主动激光频率补偿的双脉冲相位otdr分布式光纤声传感器。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.560600
Yiluo Jiang, Wenping He, Yonghang Shen
{"title":"Dual-pulse phase-OTDR-based distributed optic-fiber acoustic sensor with active laser frequency compensation.","authors":"Yiluo Jiang, Wenping He, Yonghang Shen","doi":"10.1364/OL.560600","DOIUrl":"https://doi.org/10.1364/OL.560600","url":null,"abstract":"<p><p>We report a novel, to the best of our knowledge, distributed optic-fiber acoustic sensor in which active laser frequency compensation is proposed to improve the performance of an in-balanced Mach-Zehnder interferometer (IMZI)-based dual-pulse phase-sensitive optical time-domain reflectometry (ø-OTDR). By reversely monitoring the interferometric signal from the IMZI, the laser frequency of the sensor system is actively adjusted to compensate both the interferometer arm length jitter and the laser frequency drift itself. Long-term stable interferometric signal is demonstrated, together with 60% reduction in its short-term noise. Distributed fiber sensing performance is evaluated for this frequency actively compensated sensor system, showing significant improvement in both long-term stability and signal-to-noise ratio (SNR). Compared with the system of a free-running laser, the proposed system eliminates the waveform distortion and enables a 50% noise fluctuation reduction in the retrieved waveform, showing its high signal fidelity and facilitating complex waveform reconstruction.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3493-3496"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187490","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 optoelectronic and modulation performance at low injected current by removing the p-AlGaN electron blocking layer of μ-LEDs. 通过去除μ- led的p-AlGaN电子阻挡层，提高μ- led在低注入电流下的光电和调制性能。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.561924
Yurong Dai, Zongmin Lin, Tingwei Lu, Minhao Zhao, Guifen Deng, Hongbo Jia, Chaohsu Lai, Lihong Zhu, Zhong Chen, Hao-Chung Kuo, Shouqiang Lai, Tingzhu Wu
{"title":"Enhancing optoelectronic and modulation performance at low injected current by removing the p-AlGaN electron blocking layer of μ-LEDs.","authors":"Yurong Dai, Zongmin Lin, Tingwei Lu, Minhao Zhao, Guifen Deng, Hongbo Jia, Chaohsu Lai, Lihong Zhu, Zhong Chen, Hao-Chung Kuo, Shouqiang Lai, Tingzhu Wu","doi":"10.1364/OL.561924","DOIUrl":"https://doi.org/10.1364/OL.561924","url":null,"abstract":"<p><p>This study investigates the removal of the p-AlGaN electron blocking layer (EBL) to enhance the energy efficiency of blue micro light-emitting diodes (μ-LED) devices for visible light communication (VLC) and display. The EBL removal led to improvements in crystal quality and effectively suppressed the quantum confinement Stark effect (QCSE), as compared to conventional EBL structures. μ-LEDs without the EBL exhibited a modulation bandwidth of 50.07 MHz at low current densities (3 A/cm<sup>2</sup>), marking an improvement of 23.97% over those with EBL. Furthermore, the peak external quantum efficiency (EQE) of samples without EBL reached 34.65%, which is higher than that of samples with EBL (33.06%).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3521-3524"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187492","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
Low dispersion phase-modulated rapid-scanning interferometry. 低色散相位调制快速扫描干涉测量。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-06-01 DOI: 10.1364/OL.560625
Fabian Richter, Ulrich Bangert, Friedemann Landmesser, Nicolai Gölz, Felix Riedel, Lukas Bruder
{"title":"Low dispersion phase-modulated rapid-scanning interferometry.","authors":"Fabian Richter, Ulrich Bangert, Friedemann Landmesser, Nicolai Gölz, Felix Riedel, Lukas Bruder","doi":"10.1364/OL.560625","DOIUrl":"https://doi.org/10.1364/OL.560625","url":null,"abstract":"<p><p>Time-domain interferometry is an important principle in Fourier transform (FT) and nonlinear femto- to attosecond spectroscopy. To optimize the resolution and sensitivity of this approach, various interferometer stabilization schemes have been developed. Among them, acousto-optical phase modulation (AOPM) of the interferometer arms combined with phase-synchronous lock-in detection has proven as a particular sensitive technique. However, the acousto-optical modulators (AOMs), required for this technique, introduce several disadvantages. Here, we demonstrate an alternative phase modulation scheme that omits AOMs, termed PM scheme here. As a benchmark, we directly compare the performance between the PM and the AOPM scheme in a linear FT spectroscopy experiment and find comparable sensitivity in both approaches.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 11","pages":"3668-3671"},"PeriodicalIF":3.1,"publicationDate":"2025-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144187511","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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