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Closed-loop polarization mode dispersion mitigation for fiber-optic time and frequency transfer. 用于光纤时频传输的闭环偏振模色散缓解。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.547439
Thomas Fordell, Anders E Wallin, Thomas Lindvall, Kalle Hanhijärvi
{"title":"Closed-loop polarization mode dispersion mitigation for fiber-optic time and frequency transfer.","authors":"Thomas Fordell, Anders E Wallin, Thomas Lindvall, Kalle Hanhijärvi","doi":"10.1364/OL.547439","DOIUrl":"https://doi.org/10.1364/OL.547439","url":null,"abstract":"<p><p>A polarization-switching pulse interleaver is shown to be effective in reducing timing noise due to polarization mode dispersion in time and frequency transfer based on mode-locked lasers and standard single-mode (SM) fibers. In closed-loop time transfer over a 30-km dispersion-compensated fiber link with 300 fs of differential group delay, polarization interleaving reduced the delay variations to <20 fs. The results indicate that the remaining drift is caused by polarization-dependent loss and by AM-to-PM noise conversion in the photodiodes, suggesting the need for a \"double-balanced\" phase detector in the receiver, i.e., a phase detector balanced in power and polarization. By mitigating the polarization dependence, this work demonstrates a simple approach that can potentially yield sub-femtosecond-level, long-term time transfer in long-haul fiber links utilizing standard single-mode fibers.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1759-1762"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630664","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
On-chip Mach-Zehnder interferometer for 1550 nm laser frequency stabilization.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.554895
Kang Cheng, Ning Wei, Yihui Zhang, Haixu Tao, Yibiao Hu, Jie Chen, Ningning Dong, Jiajing He, Jun Wang
{"title":"On-chip Mach-Zehnder interferometer for 1550 nm laser frequency stabilization.","authors":"Kang Cheng, Ning Wei, Yihui Zhang, Haixu Tao, Yibiao Hu, Jie Chen, Ningning Dong, Jiajing He, Jun Wang","doi":"10.1364/OL.554895","DOIUrl":"https://doi.org/10.1364/OL.554895","url":null,"abstract":"<p><p>Low-noise stable lasers have broad applications in metrology, spectroscopy, communication, and quantum physics. Here we demonstrate locking a semiconductor laser to an on-chip silicon nitride Mach-Zehnder interferometer (MZI) using the Pound-Drever-Hall (PDH) stabilization technology. After locking, the frequency noise of the laser is suppressed by up to 37 dB, and the relative stability reaches 3 <i>× </i>10<sup>-10</sup> at a gate time of 1 ms, showing an order of magnitude improvement compared to a free-running operation. In addition, the linewidth of the stabilized laser is 420 kHz at an integration time of 10 ms, narrowed by eight times.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1783-1786"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630516","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
Slow light waveguides based on bound states in the continuum.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.558273
Yuta Tanimura, Yuki Ishii, Kenta Takata, Takahiro Uemura, Masaya Notomi, Satoshi Iwamoto, Yasutomo Ota
{"title":"Slow light waveguides based on bound states in the continuum.","authors":"Yuta Tanimura, Yuki Ishii, Kenta Takata, Takahiro Uemura, Masaya Notomi, Satoshi Iwamoto, Yasutomo Ota","doi":"10.1364/OL.558273","DOIUrl":"https://doi.org/10.1364/OL.558273","url":null,"abstract":"<p><p>The concept of bound states in the continuum (BIC) has been advancing light confinement technology in leaky environments. In this Letter, we propose and numerically demonstrate a slow light waveguide based on a BIC mode. We considered a waveguide with a polymer core loaded on a plane slab, which supports a leaky guided mode coupled to the radiation continuum in the slab. We found that periodic modulation of the polymer core along the propagation direction can result in a high group index mode with a low propagation loss due to BIC confinement. The introduction of one-dimensional photonic crystals into the BIC waveguides will largely expand its functionality and applications in integrated photonics.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2013-2016"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630772","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
360° display of 3D objects by cylindrical holography.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.553152
Lei Jiang, Jie Zhou, Mohan Wang, Jiabao Wang, Yang Wu, Jun Wang
{"title":"360° display of 3D objects by cylindrical holography.","authors":"Lei Jiang, Jie Zhou, Mohan Wang, Jiabao Wang, Yang Wu, Jun Wang","doi":"10.1364/OL.553152","DOIUrl":"https://doi.org/10.1364/OL.553152","url":null,"abstract":"<p><p>Cylindrical computer-generated holography (CCGH) has garnered significant attention due to its ability to offer a 360° viewing zone. However, generating a CCGH capable of reconstructing multiple realistic three-dimensional (3D) objects is still a challenge under the constraints of limited computational resources. In this Letter, we introduce a novel, to the best of our knowledge, CCGH generation algorithm that can reconstruct 3D objects within a 360° viewing zone under limited computational resources. The algorithm generates CCGH in segments, which is achieved by calculating the light field distribution of the 3D object on the tangent plane. Numerical simulations and optical experiments validate the effectiveness of our proposed algorithm, demonstrating its superiority in reconstructing realistic 3D objects within a complete 360° viewing zone. This work represents a significant advancement in the practical application of CCGH.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1877-1880"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630655","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
Bistable soliton optical frequency combs in a second-harmonic generation Kerr cavity.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.551383
Francesco Rinaldo Talenti, Stefan Wabnitz, Yifan Sun, Tobias Hansson, Luca Lovisolo, Andrea Gerini, Giuseppe Leo, Laurent Vivien, Christian Koos, Huanfa Peng, Pedro Parra-Rivas
{"title":"Bistable soliton optical frequency combs in a second-harmonic generation Kerr cavity.","authors":"Francesco Rinaldo Talenti, Stefan Wabnitz, Yifan Sun, Tobias Hansson, Luca Lovisolo, Andrea Gerini, Giuseppe Leo, Laurent Vivien, Christian Koos, Huanfa Peng, Pedro Parra-Rivas","doi":"10.1364/OL.551383","DOIUrl":"https://doi.org/10.1364/OL.551383","url":null,"abstract":"<p><p>We study the dynamics and stability of soliton optical frequency comb generation in a dissipative, coherently pumped cavity with both second- and third-order nonlinearity. Cavity sweep simulations and linear stability analysis based on path continuation reveal the existence of bistable solitons. These families of solitons represent a continuous transition between a purely quadratic and a Kerr cavity soliton frequency comb. Perspective demonstration of these novel, to the best of our knowledge, optical sources is an ongoing relevant subject within the frequency comb community.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2037-2040"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630661","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
Lensless Fourier transform multiplexed digital holography.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.544103
Manoj Kumar, Lavlesh Pensia, Raj Kumar, Osamu Matoba
{"title":"Lensless Fourier transform multiplexed digital holography.","authors":"Manoj Kumar, Lavlesh Pensia, Raj Kumar, Osamu Matoba","doi":"10.1364/OL.544103","DOIUrl":"https://doi.org/10.1364/OL.544103","url":null,"abstract":"<p><p>In this work, a new framework of lensless Fourier transform multiplexed digital holography (LFTMDH) is proposed, leveraging the double field of view (FoV) in a single-shot recording. The proof-of-concept system with double FoV is realized by adopting a spatially multiplexing technique by inserting a cube beam splitter in the object path. The cube beam splitter divides the object beam into two FoVs with different object information. By carefully aligning and optimizing the orientation of the cube beam splitter, these two FoVs along with a spherical reference beam (generated at the object plane) are allowed to interfere with the active region of an image sensor, resulting in a multiplexed Fourier digital hologram. The object information (amplitude and phase) is obtained by applying a single Fourier transform to the recorded digital hologram, making the technique faster with the added benefit of double FoV, compared to its counterparts. The feasibility and advantages of the proposed system are demonstrated through experimental validation and comparative analysis with the existing system. The results indicate that the proposed system not only achieves double FoV imaging in a single-shot recording but also maintains spatial resolution in the reconstructed images. Its applications span various fields, such as biological microscopy, nondestructive testing, and optical metrology, where wider FoV is crucial.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1909-1912"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630687","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
Orthogonal Bragg gratings excited by single-mode reflection peaks in multi-mode no-core fibers inscribed with a femtosecond laser for vector bend sensing.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.553908
Tianxin Duan, Xingyong Li, Rongsheng Liu, Ruohui Wang, Fengyi Chen, Xueguang Qiao
{"title":"Orthogonal Bragg gratings excited by single-mode reflection peaks in multi-mode no-core fibers inscribed with a femtosecond laser for vector bend sensing.","authors":"Tianxin Duan, Xingyong Li, Rongsheng Liu, Ruohui Wang, Fengyi Chen, Xueguang Qiao","doi":"10.1364/OL.553908","DOIUrl":"https://doi.org/10.1364/OL.553908","url":null,"abstract":"<p><p>In this Letter, we propose the use of a femtosecond laser (FL) plane-by-plane (Pl-b-Pl) method to achieve narrowband single-mode reflection peak excitation directly in multi-mode no-core fibers (NCFs). The effects of different grating offsets on grating reflectivity were verified. We inscribed orthogonal fiber Bragg gratings with an offset distance of 15 <i>μ</i>m in multi-mode no-core fibers, and the bending sensitivities of the two gratings can reach -2.79 and -2.93 dB/m<sup>-1</sup>. This structure can be used as a two-dimensional vector bending sensor, especially for detecting very small bends.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1937-1940"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630693","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
Real-time frame-registered resonant fluorescence scanning laser ophthalmoscopy for quantifying static and dynamic cellular properties in the mouse retina: publisher's note.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.560030
Tianqi Song, Yao Wang, Yuxiang Zhou, Mingliang Zhou, Yanhong Ma, Donghan Ma, Jia Qu, Jinyi Zhang, Pengfei Zhang
{"title":"Real-time frame-registered resonant fluorescence scanning laser ophthalmoscopy for quantifying static and dynamic cellular properties in the mouse retina: publisher's note.","authors":"Tianqi Song, Yao Wang, Yuxiang Zhou, Mingliang Zhou, Yanhong Ma, Donghan Ma, Jia Qu, Jinyi Zhang, Pengfei Zhang","doi":"10.1364/OL.560030","DOIUrl":"https://doi.org/10.1364/OL.560030","url":null,"abstract":"<p><p>This publisher's note contains a correction to Opt. Lett.50, 1329 (2025)10.1364/OL.546343.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1843"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630716","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
Resolution-enhanced multifocal structured illumination microscopy using fluorescence fluctuations and Fourier ptychography scheme.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.555763
Bin Yu, Mengjiao Nie, Zizhen Jiang, Danying Lin, Junle Qu, Huiqun Cao
{"title":"Resolution-enhanced multifocal structured illumination microscopy using fluorescence fluctuations and Fourier ptychography scheme.","authors":"Bin Yu, Mengjiao Nie, Zizhen Jiang, Danying Lin, Junle Qu, Huiqun Cao","doi":"10.1364/OL.555763","DOIUrl":"https://doi.org/10.1364/OL.555763","url":null,"abstract":"<p><p>Multifocal structured illumination microscopy (MSIM) provides a twofold resolution enhancement over the optical diffraction limit at depths of up to 50 μm in samples. This is achieved through sparse multifocal excitation patterns and digital image post-processing, making MSIM a highly advantageous technique for the three-dimensional super-resolution (SR) imaging of thick specimens. However, the spatial resolution of MSIM is inherently constrained by its underlying imaging principles. This paper presents what we believe to be a novel method that integrates SR optical fluctuation imaging based on Fourier ptychography and deconvolution (SFPD) with MSIM, termed SFPD-MSIM. Using photoblinking InP/ZnSe/ZnS core-shell quantum dot fluorescent probes for sample labeling, we demonstrate that, compared to wide-field imaging microscopy, SFPD-MSIM achieves fourfold resolution improvement. Additionally, it substantially reduces the image-acquisition time while preserving the structural integrity of the original samples. This advancement marks a major step forward in MSIM technology, providing a powerful tool for detailed structural analysis of complex and thick biological specimens.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2005-2008"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630736","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
Smartphone-based bimodal device (SBBD) for oral precancer diagnosis and biopsy guidance in clinical settings.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.555254
Nemichand, Shivam Shukla, Bhaswati Singha Deo, Amar Nath Sah, Subrata Mishra, Rachna Rath, Asima Pradhan
{"title":"Smartphone-based bimodal device (SBBD) for oral precancer diagnosis and biopsy guidance in clinical settings.","authors":"Nemichand, Shivam Shukla, Bhaswati Singha Deo, Amar Nath Sah, Subrata Mishra, Rachna Rath, Asima Pradhan","doi":"10.1364/OL.555254","DOIUrl":"https://doi.org/10.1364/OL.555254","url":null,"abstract":"<p><p>We present a smartphone-based bimodal device (SBBD) combining fluorescence imaging and spectroscopy for a noninvasive, portable, cost-effective, and real-time diagnosis of oral precancer. The device employs a 405 nm laser excitation to capture native fluorescence from intrinsic biomarkers, including flavin adenine dinucleotide (FAD) and porphyrin, across 136 subjects representing normal, OPMD, and OSCC. The fluorescence imaging module identifies regions of interest (ROI) based on the red-to-green band ratio (porphyrinFAD), while the spectroscopy module confirms findings through multiple point measurements. A 2D convolutional neural network (CNN) classifies normal tissues, oral potentially malignant disorders (OPMD), and oral squamous cell carcinoma (OSCC) with 97.04% accuracy, 96.13% sensitivity, and 97.73% specificity. Fluorescence spectroscopy, enhanced by an artificial neural network (ANN), achieves 97.44% accuracy, 95.24% sensitivity, and 97.44% specificity. This bimodal approach effectively addresses the diagnostic gap that occurs when either spectroscopy or imaging is used independently for oral cancer detection and biopsy guidance.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1993-1996"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630778","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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