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Multicolor 4Pi single-molecule localization based on differences in interference patterns.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.553445
Jianwei Chen, Haoyu Wang, Zhaojun Lin, Yiming Li
{"title":"Multicolor 4Pi single-molecule localization based on differences in interference patterns.","authors":"Jianwei Chen, Haoyu Wang, Zhaojun Lin, Yiming Li","doi":"10.1364/OL.553445","DOIUrl":"https://doi.org/10.1364/OL.553445","url":null,"abstract":"<p><p>4Pi single-molecule localization microscopy (4Pi-SMLM) achieves sub-10 nm isotropic three-dimensional resolution, representing a significant advancement in super-resolution imaging. However, traditional multicolor imaging techniques generally require additional modifications to the optical path, which complicates the system and leads to photon loss. In this study, we introduce a new, to the best of our knowledge, multicolor imaging method that leverages the differences in 4Pi-PSF size and interference fringe spacing caused by wavelength variations, enabling multicolor 4Pi-SMLM imaging without hardware modifications. This method captures color information directly from the raw data by utilizing wavelength-dependent point spread functions (PSFs). By globally fitting the data within multiple interference channels, we could achieve both high localization accuracy and color separation accuracy for single molecules of different colors.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2346-2349"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753967","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 the theory of bi-chromatic pulsed ring lasers with synchronized transient Raman amplification.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.553521
Sergei K Turitsyn
{"title":"On the theory of bi-chromatic pulsed ring lasers with synchronized transient Raman amplification.","authors":"Sergei K Turitsyn","doi":"10.1364/OL.553521","DOIUrl":"https://doi.org/10.1364/OL.553521","url":null,"abstract":"<p><p>Analytical theory is presented for a minimal model of a Raman frequency converter with a periodically modulated/pulsed pump wave. The derived solution also describes a nonlinear Poincaré mapping in a dual-wavelength pulsed Raman laser with synchronous pumping. The particular considered lasing regime features trains of <i>M</i> pump and <i>M</i>-<i>N</i> Stokes optical pulses coexisting in the resonator with the same repetition rate and shifting relative to each other by N periods after every round trip.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2322-2325"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753980","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
Polarization-multiplexing metafiber for dual-mode bright-field and dark-field microscopy.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.551939
Zilei Liu, Yingbo Li, Xiaoyi Zhang, Siqi Li, Guoxi Wang, Wenfu Zhang
{"title":"Polarization-multiplexing metafiber for dual-mode bright-field and dark-field microscopy.","authors":"Zilei Liu, Yingbo Li, Xiaoyi Zhang, Siqi Li, Guoxi Wang, Wenfu Zhang","doi":"10.1364/OL.551939","DOIUrl":"https://doi.org/10.1364/OL.551939","url":null,"abstract":"<p><p>Bright-field and dark-field microscopy are typically used together as complementary techniques to provide comprehensive information about biological specimens with different optical absorption properties. However, switching between these two modes usually involves replacing several bulk optical components, which inevitably increases system complexity, introduces alignment challenges, and results in longer switching times. Herein, we propose a new, to the best of our knowledge, polarization-multiplexing metafiber device for dual-mode bright-field and dark-field microscopy. Utilizing a polarization-multiplexing metalens, two tailored beams (i.e., Gaussian and OAM beam) can be generated, simply by changing the handedness of the incident circularly polarized light. By integrating such metalens onto the tip of a large-mode-area photonic crystal fiber, we experimentally demonstrated that this compact and flexible metafiber can realize the dual-mode bright-field and dark-field microscopy using raspberry trichomes and pine stem, without the need to replace any optical components. The ultra-compact and flexibility features of the proposed metafiber-based dual-mode microscopy pave the way for promising applications in portable and <i>in vivo</i> biological imaging.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2163-2166"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754044","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
Polarization-recycling phase tuning in an integrated ring resonator.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.551961
Yunhao Zhang, Qingzhong Deng, Bitao Shen, Jianyang Cai, Haoren Wang, Liyuan Yao, Lei Wang, Xingjun Wang, Haowen Shu
{"title":"Polarization-recycling phase tuning in an integrated ring resonator.","authors":"Yunhao Zhang, Qingzhong Deng, Bitao Shen, Jianyang Cai, Haoren Wang, Liyuan Yao, Lei Wang, Xingjun Wang, Haowen Shu","doi":"10.1364/OL.551961","DOIUrl":"https://doi.org/10.1364/OL.551961","url":null,"abstract":"<p><p>The necessity for efficient optical phase tuning has long been critical and is increasingly urgent in light of system scaling and growing demands of data transmission. In an integrated ring resonator, the design freedom for high efficiency is even more constrained due to its ultra-compact footprint and low cross talk requirements for large-scale operation. In this Letter, we demonstrated a polarization multiplexed microring resonator for efficient phase tuning. Experimental results indicate 55%/177% enhancement in the phase tuning efficiency compared with traditional devices operated in a pure TE/TM mode. With zero change in the fabrication process, the proposed structure provides a versatile design methodology for efficiency enhancement in the realm of data communications and optical computing.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2425-2428"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754045","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
Dispersive eye-box extension in micro-OLED augmented reality glasses with a dual-holographic dispersion-compensating reflective combiner.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555710
Sangyoon Kim, Hosung Jeon, Youngjin Jeon, Youngsub Kim, Joonku Hahn, Hwi Kim
{"title":"Dispersive eye-box extension in micro-OLED augmented reality glasses with a dual-holographic dispersion-compensating reflective combiner.","authors":"Sangyoon Kim, Hosung Jeon, Youngjin Jeon, Youngsub Kim, Joonku Hahn, Hwi Kim","doi":"10.1364/OL.555710","DOIUrl":"https://doi.org/10.1364/OL.555710","url":null,"abstract":"<p><p>We propose an eye-box extension method for augmented reality (AR) glasses utilizing a dual-holographic optical element (dual-HOE) and a micro-OLED (µOLED) light source with a broadband spectrum. This scheme leverages the strong chromatic dispersion of HOE to significantly extend the eye-box without compromising AR quality. The proportional relationship between µOLED spectral bandwidth and eye-box size is analyzed theoretically, indicating that a broader spectrum µOLED provides a wider eye-box. Experimental results using a prototype demonstrate eye-box expansion up to 8 mm for µOLED with a 60 nm spectral bandwidth.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2449-2452"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753407","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
Pulsed cascaded Raman fiber laser widely tunable in the second near-infrared and visible window for hyperspectral photoacoustic imaging.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.553618
Abhigyan Goswami, Swathi Padmanabhan, Sarthak Dash, Jaya Prakash, V R Supradeepa
{"title":"Pulsed cascaded Raman fiber laser widely tunable in the second near-infrared and visible window for hyperspectral photoacoustic imaging.","authors":"Abhigyan Goswami, Swathi Padmanabhan, Sarthak Dash, Jaya Prakash, V R Supradeepa","doi":"10.1364/OL.553618","DOIUrl":"https://doi.org/10.1364/OL.553618","url":null,"abstract":"<p><p>Pulsed laser sources with nanosecond pulse duration are widely used in numerous noninvasive biomedical imaging applications, notably photoacoustic imaging (PAI), an <i>in vivo</i> imaging modality. Multiple laser sources are required to target the absorption features of multiple endogenous chromophores (optical absorbers inside tissues). We demonstrate a widely tunable pulsed cascaded Raman fiber laser continuously tunable in the second near-infrared window (NIR-II, 1060-1600 nm) and through harmonic conversion in the visible window (530-600 nm, limited by crystal availability in-house) for PAI in multiple wavelength bands. The laser generates pulse energy ∼10 μJ in the NIR-II window and ∼0.1 μJ in the visible window with a high repetition rate tunable from 20 to 80 kHz and a pulse duration tunable from 40 to 200 ns. The source is then used for PAI, demonstrating photoacoustic spectroscopy of lipids in the second resonance of C-H bonds (1145-1257 nm).</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2223-2226"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143754046","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
All-optical implementation of an optoelectronic oscillator reservoir computer with an integrated spatial photonic processor.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.557054
Dengfei Tang, En Liang, Haibin Zhao, Ziwei Li
{"title":"All-optical implementation of an optoelectronic oscillator reservoir computer with an integrated spatial photonic processor.","authors":"Dengfei Tang, En Liang, Haibin Zhao, Ziwei Li","doi":"10.1364/OL.557054","DOIUrl":"https://doi.org/10.1364/OL.557054","url":null,"abstract":"<p><p>Reservoir computing (RC), inspired by neural networks, has gained significant attention for tackling complex tasks such as recognition and classification. Most RC implementations are limited to software, which restricts processing speed, as reservoir outputs are often processed through slow, digital offline post-processing in previous work. To address these constraints, we propose a solution that combines a nonlinear time-delayed optoelectronic oscillator (OEO) with an integrated spatial photonic processor (ISPP) for online reservoir output processing. This approach leverages both temporal multiplexing and spatial processing, enabling high-speed, and parallel hardware implementation. We achieve enhanced performance in modulation format recognition (MFR) for visible light communication (VLC) signals using a photonic reservoir with 64 nodes. Tests on 16 widely used modulation formats at a 2 Gbps data rate over a 1.2 m VLC transmission link demonstrate that this spatiotemporal multiplexing technique can accurately classify all formats, achieving a state-of-the-art overall accuracy of 99.5%.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2338-2341"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753985","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 Gaussian to high-order Laguerre-Gauss beam shaping in a GRIN multimode fiber.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.550610
Wasyhun A Gemechu, Mario Ferraro, Stefan Wabnitz, Fabrizio Frezza, Fabio Mangini
{"title":"Direct Gaussian to high-order Laguerre-Gauss beam shaping in a GRIN multimode fiber.","authors":"Wasyhun A Gemechu, Mario Ferraro, Stefan Wabnitz, Fabrizio Frezza, Fabio Mangini","doi":"10.1364/OL.550610","DOIUrl":"https://doi.org/10.1364/OL.550610","url":null,"abstract":"<p><p>We report our observation of a direct transformation of a Gaussian-like laser beam, initially injected into the cladding of a graded-index multimode fiber (MMF), into a high-order Laguerre-Gauss (LG) mode within the fiber core.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2314-2317"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753421","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
Enhanced Fourier single-pixel imaging via positive-negative dithering.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.551685
Haiyu Fan, Shijian Li, Chongwu Shao, Yinran Shen, Xu-Ri Yao, Qing Zhao
{"title":"Enhanced Fourier single-pixel imaging via positive-negative dithering.","authors":"Haiyu Fan, Shijian Li, Chongwu Shao, Yinran Shen, Xu-Ri Yao, Qing Zhao","doi":"10.1364/OL.551685","DOIUrl":"https://doi.org/10.1364/OL.551685","url":null,"abstract":"<p><p>Fourier single-pixel imaging (FSI) takes full advantage of the high modulation speed of digital micromirror devices by applying upsampling and spatial dithering to binarize grayscale Fourier patterns, thereby achieving efficient imaging. However, the upsampling process of patterns sacrifices spatial resolution. Here, we propose a binarization method for FSI that enhances reconstructed image quality without the need for upsampling. The key is applying spatial dithering with a serpentine path directly to both positive and negative components of Fourier patterns before binarization. By quantizing these components into {-1, 0, +1} values and subsequently mapping them to binary patterns, our method reduces quantization errors in Fourier coefficient acquisition. Both simulation and experimental results demonstrate that the method significantly improves imaging quality. It can also be applied to other types of single-pixel imaging that use positive-negative grayscale patterns.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2247-2250"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753751","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
Eye-safe 1.5 µm passively Q-switched solid-state Raman laser.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-04-01 DOI: 10.1364/OL.555069
Hong Zhang, Nihui Zhang, Di Xin, Hongkun He, Jianghao Xu, Xuyan Zhou, Wanhua Zheng, Hongbo Zhang
{"title":"Eye-safe 1.5 µm passively Q-switched solid-state Raman laser.","authors":"Hong Zhang, Nihui Zhang, Di Xin, Hongkun He, Jianghao Xu, Xuyan Zhou, Wanhua Zheng, Hongbo Zhang","doi":"10.1364/OL.555069","DOIUrl":"https://doi.org/10.1364/OL.555069","url":null,"abstract":"<p><p>Due to the low output energy of the passively Q-switched laser, a challenge is to achieve an efficient stimulated Raman generation via a passively Q-switched laser pumping strategy, especially the generation of a Raman laser at 1.5 µm. In this paper, the first-order Raman laser at 1525 nm was successfully demonstrated through a passively Q-switched Nd:YVO<sub>4</sub>/V:YAG excitation with a compact and an easily integrable structure. The pulse energy at 1525 nm could be up to 17.6 µJ at 1 kHz repetition rate with a pulse duration of 6.2 ns. The corresponding optical efficiency was 23%, and the measured beam quality factor M<sup>2</sup> < 1.3. Raman lasers operating at 1.5 µm have important applications in fields such as optical communication, laser scanning, distance measurement, remote sensing, and spectral analysis.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 7","pages":"2137-2140"},"PeriodicalIF":3.1,"publicationDate":"2025-04-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143753762","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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