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Microwave frequency shift keying optoelectronic oscillator (FSK-OEO) based on an optical single-sideband (OSSB) modulator. 基于光单边带调制器的微波频移键控光电振荡器(FSK-OEO)。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.567109
Xin Wen, Jichen Guo, Chongjia Huang, Peng Hao, X Steve Yao
{"title":"Microwave frequency shift keying optoelectronic oscillator (FSK-OEO) based on an optical single-sideband (OSSB) modulator.","authors":"Xin Wen, Jichen Guo, Chongjia Huang, Peng Hao, X Steve Yao","doi":"10.1364/OL.567109","DOIUrl":"https://doi.org/10.1364/OL.567109","url":null,"abstract":"<p><p>A microwave frequency shift keying optoelectronic oscillator (FSK-OEO) based on an optical single-sideband (OSSB) modulator is proposed and experimentally demonstrated. In the proposed FSK-OEO, a dual-drive Mach-Zehnder modulator (DDMZM) is employed to implement the optical single sideband modulation through the 90° phase shift method. By appropriately setting the amplitude of the coding signal applied to the DC port of the DMZM, a FSK microwave signal is generated. In the experiment, 9.995/10.004 GHz and 10.371/11.014 GHz microwave FSK signals were successfully generated by using the proposed OEO scheme. This scheme can generate high-frequency and low-phase-noise FSK signals without relying on high-frequency signal sources. Additionally, the pulse compression performance of the generated signals was also demonstrated.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5706-5709"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070076","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
Structured light radial-view endoscope PROBE for IMAGING of colorectal tissue. 结构光放射状内窥镜探头用于结直肠组织成像。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.571418
Xiyan Li, Jinhua Xu, Yixiao Lin, Quing Zhu
{"title":"Structured light radial-view endoscope PROBE for IMAGING of colorectal tissue.","authors":"Xiyan Li, Jinhua Xu, Yixiao Lin, Quing Zhu","doi":"10.1364/OL.571418","DOIUrl":"https://doi.org/10.1364/OL.571418","url":null,"abstract":"<p><p>White-light endoscopy (WLE) is the current gold standard for endoscopic colorectal cancer screening. However, it lacks the ability to image subsurface colorectal tissue and provide functional assessments necessary for early-stage cancer identification and post-treatment evaluation. Spatial frequency domain imaging (SFDI) provides subsurface quantitative absorption and scattering properties, which can assist in distinguishing between different tissue types. In this paper, we present a new, to the best of our knowledge, compact, radial-view, dual-wavelength (740 nm and 850 nm) SFDI system and its accompanying reconstruction algorithm. The proposed system achieves real-time full circumferential imaging of the intestinal lumen and provides functional parameter estimation from a single snapshot. The performance of this endoscopic probe is evaluated using biomimetic microvascular phantoms, and its potential for biological tissue imaging is demonstrated through imaging of <i>ex vivo</i> human colorectal tissue.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5801-5804"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070110","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
Significant enhancement of dual-polarization nonreciprocity by twisted α-MoO3/Weyl semimetals heterostructure. 扭曲α-MoO3/Weyl半金属异质结构显著增强双极化非互易性。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.570183
Jimin Fang, Jingcheng Yu, Jiaqi Zou, Xiaoqiang Sun, Yuanda Wu, Daming Zhang
{"title":"Significant enhancement of dual-polarization nonreciprocity by twisted <i>α</i>-MoO<sub>3</sub>/Weyl semimetals heterostructure.","authors":"Jimin Fang, Jingcheng Yu, Jiaqi Zou, Xiaoqiang Sun, Yuanda Wu, Daming Zhang","doi":"10.1364/OL.570183","DOIUrl":"https://doi.org/10.1364/OL.570183","url":null,"abstract":"<p><p>The twisted <i>α</i>-MoO<sub>3</sub> has been widely utilized in the near-field radiative heat transfer, as well as the far-field thermal radiation. However, the valuable nonreciprocal thermal radiation between Weyl semimetals and twisted <i>α</i>-MoO<sub>3</sub> has yet to be investigated. In this work, the twisted <i>α</i>-MoO<sub>3</sub>/Weyl semimetals heterostructures separated by Ge dielectric layer are studied to find out the relationship between the twisted <i>α</i>-MoO<sub>3</sub> and the dual-polarization nonreciprocity. Through research on polarization conversions, the enhancement of dual-polarization nonreciprocity is confirmed to arise from the increment of discrepancy of the co-polarized reflectivity components, which depends on the twisted angles. The twisted <i>α</i>-MoO<sub>3</sub> breaks the mirror symmetry and rotational symmetry, providing nonreciprocal absorption effects for TE polarization. The study on electric field distributions reveals that the dual-polarization nonreciprocity arises from the excitation of Fabry-Perot modes in Ge dielectric layer. The proposed scheme incorporates twisted optics and nonreciprocal thermal radiation, which provides an effective solution for the design of the dual-polarization nonreciprocal thermal emitters.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5726-5729"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070113","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
Targeted regulation of InP quantum dots for high CRI eco-friendly warm white LEDs. 针对高显色指数环保暖白光led的InP量子点调控。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.575113
Shuaipu Zang, Han Xu, Jiaojiao Song, Lei Wang, Huaibin Shen, Lin Song Li
{"title":"Targeted regulation of InP quantum dots for high CRI eco-friendly warm white LEDs.","authors":"Shuaipu Zang, Han Xu, Jiaojiao Song, Lei Wang, Huaibin Shen, Lin Song Li","doi":"10.1364/OL.575113","DOIUrl":"https://doi.org/10.1364/OL.575113","url":null,"abstract":"<p><p>The inevitable requirement for the future development of quantum dot lighting is environmental friendliness. Although CuInS<sub>2</sub> and InP are typical representatives of eco-friendly quantum dot materials, their corresponding devices exhibit suboptimal performance in terms of meeting the criteria for high-quality lighting, with issues such as insufficient color rendering index and excessive correlated color temperature. Herein, the utilization of broad-emitting Cu-In-Zn-S quantum dots as the light-emitting fundamental unit, in conjunction with directionally modulated InP quantum dots of narrow emission linewidth, has yielded a concomitant enhancement in device performance parameters. The optimal device exhibited a color rendering index of 93, a luminous efficiency of 63.3 lm/W, a correlated color temperature of 3088 K, and a CIE of (0.431, 0.404), thereby meeting the lighting standards stipulated by the American National Standards Institute. This device construction strategy holds promise for further development in the field of quantum dots green lighting.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5897-5900"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070168","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
Regulating the inherent anisotropic chemical etching of optical crystals by femtosecond laser for anti-reflective windows with 100% yield. 飞秒激光对光学晶体固有各向异性化学蚀刻的调节,达到100%产率。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.572285
Xin Zhang, Xue-Qing Liu, Yue-Zhang Sun, Zhi-Yan Zhao, Xin-Ran Yuan, Zhi-Yong Hu, Lei Wang, Qi-Dai Chen
{"title":"Regulating the inherent anisotropic chemical etching of optical crystals by femtosecond laser for anti-reflective windows with 100% yield.","authors":"Xin Zhang, Xue-Qing Liu, Yue-Zhang Sun, Zhi-Yan Zhao, Xin-Ran Yuan, Zhi-Yong Hu, Lei Wang, Qi-Dai Chen","doi":"10.1364/OL.572285","DOIUrl":"https://doi.org/10.1364/OL.572285","url":null,"abstract":"<p><p>Femtosecond laser modification followed by wet etching is a promising method for manufacturing anti-reflective structures on crystals. However, the anisotropic etching of crystals significantly influences the final morphology and severely limits their performance and applications. In this work, a femtosecond laser interface engineering method is proposed to regulate the anisotropic etching of crystals and fabricated structures on sapphire previously unattainable through conventional etching to prove its effectiveness. As a demonstration, moth-eye anti-reflective structures were successfully fabricated on C-cut sapphire with 92% transmission (the single-sided anti-reflective theoretical maximum), significantly improving the fabrication yield from 73.3% to 100% in multi-batch manufacturing. These results demonstrate that the femtosecond laser can effectively regulate the structural morphology of crystals, paving the way for the development of advanced optical structures with tailored properties for optoelectronic and photonic applications.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5602-5605"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070179","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
Monolithic highly efficient 272 W nested-ring structured-core thulium fiber laser at 1940 nm. 1940nm单片高效272w嵌套环结构芯铥光纤激光器。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.566019
Richard Švejkar, Martin P Buckthorpe, Bára Švejkarová, Peter C Shardlow, W Andrew Clarkson
{"title":"Monolithic highly efficient 272 W nested-ring structured-core thulium fiber laser at 1940 nm.","authors":"Richard Švejkar, Martin P Buckthorpe, Bára Švejkarová, Peter C Shardlow, W Andrew Clarkson","doi":"10.1364/OL.566019","DOIUrl":"https://doi.org/10.1364/OL.566019","url":null,"abstract":"<p><p>A novel, to the best of our knowledge, thulium-doped silica fiber with a non-uniform core doping profile has been utilized to demonstrate a high-power monolithic laser oscillator system. The fiber laser achieved a continuous-wave (CW) output power of 272 W at 1940 nm with slope efficiencies of 68% and 71% with respect to launched and absorbed pump power, respectively. This novel Tm fiber design enabled the generation of the highest reported output power from a single-mode, small core ($<$15 µm diameter) non-pedestal fiber. Moreover, the slope efficiency achieved is the maximum reported to date for a single-mode thulium fiber laser operating at >100 W output power level.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5614-5617"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069513","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
Multi-spectral all-dielectric co-aperture metasurface with high microwave transmission and infrared focusing. 具有高微波透射和红外聚焦的多光谱全介电共孔径超表面。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.570413
Dengshuang Yi, Jiakai Zhang, Zhiyi Zhang, Jialin Mei, Jian Bai, Jiahui Fu, Kuang Zhang, Shah Nawaz Burokur
{"title":"Multi-spectral all-dielectric co-aperture metasurface with high microwave transmission and infrared focusing.","authors":"Dengshuang Yi, Jiakai Zhang, Zhiyi Zhang, Jialin Mei, Jian Bai, Jiahui Fu, Kuang Zhang, Shah Nawaz Burokur","doi":"10.1364/OL.570413","DOIUrl":"https://doi.org/10.1364/OL.570413","url":null,"abstract":"<p><p>In this Letter, we propose a metasurface for microwave-infrared (MW-IR) co-aperture detection, which presents the advantages of low-profile, light-weight, and low cost for a facilitated integration compared to conventional MW-IR co-aperture devices. In the microwave domain, based on impedance matching, a polarization-insensitive transparent window at Ka band is achieved, and in the infrared domain, focusing is realized through a metalens by judiciously designing the diameter of the nanopillars to modulate the phase distribution at a wavelength of 9.68 <i>μ</i>m. To validate the co-aperture design framework, a proof-of-concept metasurface prototype is fabricated and experimentally tested. The measured results demonstrate good agreement with simulations, validating an innovative approach for MW-IR hybrid sensing, which may have potential applications in target detection, autonomous vehicles, and smart homes.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5905-5908"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069941","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
Multipass cell SERF atomic magnetometer based on parallel plate configuration. 基于平行极板结构的多通单元SERF原子磁强计。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.565523
Yibo Qi, Shuying Wang, Zhaoyu Ye, Nuozhou Xu, Bo Li, Jixi Lu
{"title":"Multipass cell SERF atomic magnetometer based on parallel plate configuration.","authors":"Yibo Qi, Shuying Wang, Zhaoyu Ye, Nuozhou Xu, Bo Li, Jixi Lu","doi":"10.1364/OL.565523","DOIUrl":"https://doi.org/10.1364/OL.565523","url":null,"abstract":"<p><p>We introduce a novel, to the best of our knowledge, compact multipass cell design for spin-exchange relaxation-free (SERF) atomic magnetometers, replacing conventional reflective cavities with a dual-parallel plate configuration. This adjustable planar reflector setup achieves precise control of reflection optical paths and dramatically enhances signal response, resolving the complexity of cavity design and volume increase caused by multiple reflectors in existing schemes, while having high-temperature adaptability and minimizing size and complexity. Additionally, combined with a flat-top light pump to boost atomic polarization uniformity, our system achieves 1 fT/Hz<sup>½</sup> sensitivity, delivering 260% improvement in signal and 200% in sensitivity over conventional designs. This streamlined, high-temperature-compatible architecture marks a significant step toward scalable, next-generation quantum sensors that unite exceptional sensitivity with practical miniaturization.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5550-5553"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069990","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
Edge contrast enhancement using vortex speckles. 利用涡斑增强边缘对比度。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.561566
Kang-Min Lee, Cristian Hernando Acevedo, Aristide Dogariu
{"title":"Edge contrast enhancement using vortex speckles.","authors":"Kang-Min Lee, Cristian Hernando Acevedo, Aristide Dogariu","doi":"10.1364/OL.561566","DOIUrl":"https://doi.org/10.1364/OL.561566","url":null,"abstract":"<p><p>We study, theoretically and experimentally, the edge contrast performance when the illumination is provided by partially coherent fields originating from Gaussian or perfect optical vortex (POV) beams. We demonstrate that the latter permits one to better distinguish object discontinuities and improves the edge contrast. Our results suggest that active illumination procedures for target detection and discrimination could benefit from the additional flexibility provided by using partially coherent light from a POV.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5542-5545"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070018","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
Demonstration of a real-time E/W-band wireless transmission system over a 20-km SSMF and a 3.7-km wireless link with 24-hour continuous field testing. 演示实时E/ w波段无线传输系统,在20公里的SSMF和3.7公里的无线链路上进行24小时连续现场测试。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.569044
Yizhou Wang, Qichao Lu, Li Tao, Chenghao Chay, Yuanxiang Wang, Tong Cheng, Renjie Li, Chen Liu, Lei Deng, Liang Wang, Xiaoxiao Dai, Qi Yang, William Shieh, Deming Liu
{"title":"Demonstration of a real-time E/W-band wireless transmission system over a 20-km SSMF and a 3.7-km wireless link with 24-hour continuous field testing.","authors":"Yizhou Wang, Qichao Lu, Li Tao, Chenghao Chay, Yuanxiang Wang, Tong Cheng, Renjie Li, Chen Liu, Lei Deng, Liang Wang, Xiaoxiao Dai, Qi Yang, William Shieh, Deming Liu","doi":"10.1364/OL.569044","DOIUrl":"https://doi.org/10.1364/OL.569044","url":null,"abstract":"<p><p>The fifth-generation (5G) communication provides rapid growth in global data traffic, bringing millimeter waves into focus due to its large available bandwidth. Here we successfully demonstrate a real-time long-haul photonics-aided E/W-band wireless transmission system, achieving 12.5 Gb/s over a practical 3.7-km wireless link. A continuous 24-hour field test under fluctuating humidity, temperature, and wind speed conditions robustly validates the system's reliability and confirms its feasibility for real-world deployment. We also carried out experiments combining a 20-km standard single-mode fiber (SSMF) with the 3.7-km wireless segment, analyzing the fiber-induced performance impairments. The proposed millimeter-wave wireless communication system thus demonstrates significant potential to meet the evolving requirements of next-generation mobile networks.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5881-5884"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070049","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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