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Diversity-enhanced multicarrier transmission for secure, band-limited, and turbulent UOWC systems. 分集增强多载波传输安全，带宽有限，和紊流UOWC系统。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-10-01 DOI: 10.1364/OL.570771
Yang Ye, Chen Chen, Zhihong Zeng, Dengke Wang, Harald Haas
{"title":"Diversity-enhanced multicarrier transmission for secure, band-limited, and turbulent UOWC systems.","authors":"Yang Ye, Chen Chen, Zhihong Zeng, Dengke Wang, Harald Haas","doi":"10.1364/OL.570771","DOIUrl":"https://doi.org/10.1364/OL.570771","url":null,"abstract":"<p><p>Low-pass band limitation and turbulence are two critical issues faced by practical underwater optical wireless communication (UOWC) systems. In this Letter, we propose an orthogonal frequency division multiplexing (OFDM)-based diversity-enhanced multicarrier (D-MC) scheme for joint mitigation of low-pass band limitation and turbulence issues in UOWC systems. The OFDM-based D-MC scheme is realized by performing diversity transmission in both the frequency and time domains during OFDM modulation. Moreover, to enhance the security of OFDM-based D-MC transmission, a two-stage chaotic encryption scheme is further proposed which includes chaotic phase rotation and chaotic scrambling. Experimental results show that OFDM-based D-MC with 2D diversity can achieve a substantial 69.9% usable bandwidth extension compared with the conventional scheme without diversity.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 19","pages":"6077-6080"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145207277","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
Energy-level-dominated luminescence tuning of Mn2+-doped Cs3Cu2I5 perovskites for single-component white LEDs. Mn2+掺杂Cs3Cu2I5钙钛矿对单组分白光led的能量支配发光调谐。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-10-01 DOI: 10.1364/OL.570910
Jie Chen, Bowen Shang, Yu Li, Zhe Yin, Feng Teng, Aiwei Tang
{"title":"Energy-level-dominated luminescence tuning of Mn<sup>2+</sup>-doped Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> perovskites for single-component white LEDs.","authors":"Jie Chen, Bowen Shang, Yu Li, Zhe Yin, Feng Teng, Aiwei Tang","doi":"10.1364/OL.570910","DOIUrl":"https://doi.org/10.1364/OL.570910","url":null,"abstract":"<p><p>In current white-light-emitting diodes (WLEDs), broadband emission is typically achieved by mixing multiple luminescent components. However, challenges such as interfacial incompatibility and energy-level misalignment significantly limit device performance and industrial scalability. To address these limitations of issues, this study proposes an Mn<sup>2+</sup>-doped Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> lead-free perovskite for luminescence regulation and successfully constructs a single-component WLED. Through a grinding-calcination process, Mn<sup>2+</sup> is doped into the Cs<sub>3</sub>Cu<sub>2</sub>I<sub>5</sub> lattice, introducing additional energy levels and activating d-d transitions. This enables an energy-level-dominated transformation from single-band blue emission to dual-band blue-yellow emission. Based on this strategy, we fabricated a series of color-tunable LED devices. Among them, the optimized WLED exhibits Commission Internationale de l'Éclairage chromaticity coordinates of (0.28, 0.33) and a color rendering index of 64.2, demonstrating excellent operational stability. This work challenges the conventional perception that white-light emission requires multi-component synergy and offers a novel design strategy for future lead-free perovskite-based WLEDs. It also opens up new ways, to the best of our knowledge, for the development of environmentally friendly and energy-efficient lighting appliances.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 19","pages":"6081-6084"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145207288","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
Observation of defect-modulated photobleaching in bismuth-erbium co-doped fibers. 铋-铒共掺光纤中缺陷调制光漂白的观察。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-10-01 DOI: 10.1364/OL.571533
Yuqin Zhang, Qi Yang, Yushi Chu, Jianzhong Zhang, Gang-Ding Peng
{"title":"Observation of defect-modulated photobleaching in bismuth-erbium co-doped fibers.","authors":"Yuqin Zhang, Qi Yang, Yushi Chu, Jianzhong Zhang, Gang-Ding Peng","doi":"10.1364/OL.571533","DOIUrl":"https://doi.org/10.1364/OL.571533","url":null,"abstract":"<p><p>The photobleaching (PB) phenomenon associated with silicon-related bismuth active centers (BAC-Si) in bismuth/erbium co-doped optical fibers (BEDFs) has been shown to significantly impact E-band gain characteristics. Extensive research has established a connection between the kinetics of PB and the defects associated with BAC-Si. To better understand the effect of defects on PB, different from the conventional direct ultraviolet laser irradiation, this work uses an 830-nm laser to excite BAC-Si to a metastable state initially, then uses a 248-nm excimer laser irradiation BEDF during the relaxation, and finally, is followed by a second PB process. Compared to directly irradiated BEDF, BAC-Si in a metastable state is more likely to receive or release charges. The experimental results indicate that the luminescence intensity of BAC-Si has decreased, while the PB effect has intensified after irradiation, a phenomenon associated with defect alterations induced by the 248-nm irradiation. This work provides experimental evidence that supports previous hypotheses regarding the generation of PB in BAC-Si. Additionally, it lays the groundwork for a more comprehensive understanding of the luminescence mechanism of bismuth.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 19","pages":"5941-5944"},"PeriodicalIF":3.3,"publicationDate":"2025-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145207299","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
Photochromic effect in titanium-doped synthetic sapphire. 掺钛合成蓝宝石的光致变色效应。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.568035
Tsung-Han Tsai, Shiyun Jin, Michael C Jollands, Daniel C Jones
{"title":"Photochromic effect in titanium-doped synthetic sapphire.","authors":"Tsung-Han Tsai, Shiyun Jin, Michael C Jollands, Daniel C Jones","doi":"10.1364/OL.568035","DOIUrl":"https://doi.org/10.1364/OL.568035","url":null,"abstract":"<p><p>This study investigates the photochromic behavior of titanium-doped sapphire (Al<sub>2</sub>O<sub>3</sub>:Ti<sup>4+</sup>). The material exhibits reversible photochromism: exposure to light with wavelengths shorter than 290 nm induces a brown coloration, while wavelengths longer than 290 nm restore the sample to colorless. The photochromic color is stable at room temperature but becomes unstable above 150 °C. In situ absorption and photoluminescence spectroscopy were employed to examine the underlying mechanism. The experimental results support the model that the brown coloration arises from electron holes trapped next to cation vacancies. These findings provide more detailed insights into the electron reactions of the photochromic centers in Ti-doped sapphire.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5714-5717"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069897","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
Efficient high-power Yb:LuAG Innoslab ultrafast amplifier compressible to 360 fs. 高效高功率Yb:LuAG Innoslab超快放大器可压缩到360秒。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.572590
Yuguang Huang, Jie Guo, Zichen Gao, Jinfeng Li, Ge Zhang, Weidong Chen, Valentin Petrov, Xiaoyan Liang
{"title":"Efficient high-power Yb:LuAG Innoslab ultrafast amplifier compressible to 360 fs.","authors":"Yuguang Huang, Jie Guo, Zichen Gao, Jinfeng Li, Ge Zhang, Weidong Chen, Valentin Petrov, Xiaoyan Liang","doi":"10.1364/OL.572590","DOIUrl":"https://doi.org/10.1364/OL.572590","url":null,"abstract":"<p><p>We report on the first, to the best of our knowledge, high-efficiency Yb:LuAG-based Innoslab amplifier delivering 242 W average output power with a pulse energy of 1.37 mJ at 175 kHz, compressible down to 360 fs via a grating compressor. The system achieves an optical efficiency of 40.7% and exhibits remarkable power stability with an RMS fluctuation of only 0.11%. Notably, this compact, single-stage amplifier architecture generates 191 W of amplified output power from a 1-W injection seed while maintaining excellent beam quality (M<sup>2</sup> < 1.5) at the maximum output.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5606-5609"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070021","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
Manifold optics. 廖光学。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.565477
Hongming Shen, Wen Xiao, Fei Fang Chung, Huanyang Chen
{"title":"Manifold optics.","authors":"Hongming Shen, Wen Xiao, Fei Fang Chung, Huanyang Chen","doi":"10.1364/OL.565477","DOIUrl":"https://doi.org/10.1364/OL.565477","url":null,"abstract":"<p><p>Transformation optics establishes an equivalence relationship between gradient media and curved space, unveiling intrinsic geometric properties of gradient media. However, this approach based on curved spaces is concentrated on two-dimensional manifolds, namely, curved surfaces. In this Letter, we establish an intrinsic connection between three-dimensional manifolds and three-dimensional gradient media in transformation optics by leveraging the Yamabe problem and Ricci scalar curvature-a measure of spatial curvature in manifolds. The invariance of the Ricci scalar under conformal mappings is proven. Our framework is validated through the analysis of representative conformal optical lenses.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5702-5705"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070022","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
Direct monocular vision algorithm based on deep constraints of point and line features fusion: publisher's note. 基于点与线特征融合深度约束的直接单目视觉算法：出版者注。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.572476
Keqiang Bai, Xiuhong Li, Yalan Zhu, Feiyan Wang
{"title":"Direct monocular vision algorithm based on deep constraints of point and line features fusion: publisher's note.","authors":"Keqiang Bai, Xiuhong Li, Yalan Zhu, Feiyan Wang","doi":"10.1364/OL.572476","DOIUrl":"https://doi.org/10.1364/OL.572476","url":null,"abstract":"<p><p>This publisher's note contains a correction to Opt. Lett.50, 3804 (2025)10.1364/OL.552010.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5758"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070043","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
16×56-Gbps WDM transmission in an atomic-layer-deposited Er-doped waveguide amplifier. 16×56-Gbps原子层沉积掺铒波导放大器中的WDM传输。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.570116
Hao Zhang, Yanze Wang, Yichen He, Shengyun Zhu, Yaping Liu, Xiaoyan Zhou, Lin Zhang
{"title":"16×56-Gbps WDM transmission in an atomic-layer-deposited Er-doped waveguide amplifier.","authors":"Hao Zhang, Yanze Wang, Yichen He, Shengyun Zhu, Yaping Liu, Xiaoyan Zhou, Lin Zhang","doi":"10.1364/OL.570116","DOIUrl":"https://doi.org/10.1364/OL.570116","url":null,"abstract":"<p><p>Driven by the increasing demand for efficient optical communication, on-chip amplifiers have become essential components in photonic integrated circuits for realizing cost-efficient and compact wavelength-division multiplexing (WDM) receivers. In this work, we investigate the WDM signal transmission performance of an on-chip erbium-doped aluminum-oxide waveguide amplifier, fabricated using atomic layer deposition. The waveguide amplifier demonstrates a net gain of >5.0 dB across the entire C-band, with a peak value of 11.1 ± 1.5 dB at 1531.6 nm, corresponding to an off-chip net gain of 7.1 ± 1.5 dB. A maximum on-chip output power of 4.1 ± 1.4 dBm at 1531.6 nm is achieved. Broadband performance is further confirmed by a 16-channel gain measurement. Finally, a 16-channel 56-Gbps WDM transmission is demonstrated, with the Q<sup>2</sup> values comparable to those of the back-to-back transmission, highlighting the potential of the amplifier for high-speed coherent data transmission.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5594-5597"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069988","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
InAlAs digital alloy avalanche photodiode with partially depleted absorber. 部分耗尽吸收器的数字合金雪崩光电二极管。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.568050
Wenyang Wang, Jinshan Yao, Lize Li, Luyu Wang, Tianyu Long, Huachen Ge, Hong Lu, Baile Chen
{"title":"InAlAs digital alloy avalanche photodiode with partially depleted absorber.","authors":"Wenyang Wang, Jinshan Yao, Lize Li, Luyu Wang, Tianyu Long, Huachen Ge, Hong Lu, Baile Chen","doi":"10.1364/OL.568050","DOIUrl":"https://doi.org/10.1364/OL.568050","url":null,"abstract":"<p><p>Digital alloy (DA) InAlAs has been employed as the multiplication layer in separate absorption, grading, charge, and multiplication (SAGCM) avalanche photodiodes (APDs) to suppress excess noise in our previous work. In this work, a partially depleted absorber (PDA) is introduced to enhance bandwidth, while a back-illumination structure with flip-chip bonding is utilized to improve quantum efficiency and further boost response speed through inductive peaking. The APD exhibits a dark current density of approximately 8.5 mA/cm² at 90% breakdown voltage, a multiplication gain of 50 before avalanche breakdown, and a responsivity of 0.49 A/W at unit gain. Frequency response measurements indicate a significant improvement after flip-chip bonding, with the bandwidth increasing from 15.6 GHz to 22 GHz. Eye diagrams were obtained at data rates up to 40 Gbps, demonstrating the device's high-speed performance.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5873-5876"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145069998","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 of intrinsic properties of high-quality fiber Fabry-Perot resonators. 高质量光纤法布里-珀罗谐振器的本征特性研究。
IF 3.3 2区 物理与天体物理
Optics letters Pub Date : 2025-09-15 DOI: 10.1364/OL.570921
Germain Bourcier, Stephane Balac, Safia Mohand-Ousaid, Julien Lumeau, Antonin Moreau, Vincent Crozatier, Pierre Sillard, Marianne Bigot, Laurent Bigot, Olivier Llopis, Arnaud Fernandez
{"title":"Investigation of intrinsic properties of high-quality fiber Fabry-Perot resonators.","authors":"Germain Bourcier, Stephane Balac, Safia Mohand-Ousaid, Julien Lumeau, Antonin Moreau, Vincent Crozatier, Pierre Sillard, Marianne Bigot, Laurent Bigot, Olivier Llopis, Arnaud Fernandez","doi":"10.1364/OL.570921","DOIUrl":"https://doi.org/10.1364/OL.570921","url":null,"abstract":"<p><p>Fiber Fabry-Perot (FFP) resonators of a few centimeters are optimized as a function of the reflectivity of the mirrors and the dimensions of the intra-cavity waveguide. Loaded quality factor in excess of 10<sup>9</sup>, with an optimum of ~4 × 10<sup>9</sup>, together with an intrinsic quality factor larger than 10<sup>10</sup> and intrinsic finesse in the range of 10<sup>5</sup> have been measured. An application to the stabilization of laser frequency fluctuations is presented.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 18","pages":"5566-5569"},"PeriodicalIF":3.3,"publicationDate":"2025-09-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145070057","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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