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Phase noise characterization of a Cr:ZnS frequency comb using subspace tracking.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.550901
Aleksandr Razumov, Sergey Vasilyev, Mike Mirov, Jasper Riebesehl, Holger R Heebøll, Francesco Da Ros, Darko Zibar
{"title":"Phase noise characterization of a Cr:ZnS frequency comb using subspace tracking.","authors":"Aleksandr Razumov, Sergey Vasilyev, Mike Mirov, Jasper Riebesehl, Holger R Heebøll, Francesco Da Ros, Darko Zibar","doi":"10.1364/OL.550901","DOIUrl":"https://doi.org/10.1364/OL.550901","url":null,"abstract":"<p><p>We present a comprehensive phase noise characterization of a mid-IR Cr:ZnS frequency comb. Despite their emergence as a platform for high-resolution dual-comb spectroscopy (DCS), detailed investigations into the phase noise of Cr:ZnS combs have been lacking. To address this, we use a recently proposed phase noise measurement technique that employs multi-heterodyne detection and subspace tracking. This allows for the measurement of common mode, repetition rate, and high-order phase noise terms and their corresponding scaling as a function of a comb-line number, using a single measurement setup. We demonstrate that the comb under test is dominated by the common mode phase noise, while all the other phase noise terms are below the measurement noise floor (∼-120 dB rad<sup>2</sup>/Hz) and are thereby not identifiable.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1873-1876"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630694","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
Relativistic ponderomotive force in the regime of extreme focusing.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.546892
Johan Ribbing, Giovanni Perosa, Vitaliy Goryashko
{"title":"Relativistic ponderomotive force in the regime of extreme focusing.","authors":"Johan Ribbing, Giovanni Perosa, Vitaliy Goryashko","doi":"10.1364/OL.546892","DOIUrl":"https://doi.org/10.1364/OL.546892","url":null,"abstract":"<p><p>When charged particles interact with laser fields, they are usually thought to be pushed out from the regions of higher laser intensity via the mechanism known as the ponderomotive force (PMF). In contrast to the existing theories, we show that there exist several regimes in which charged particles are drawn into the regions of strongly focused laser fields. We derive a simple, covariant, and relativistically correct expression for the ponderomotive laser force that holds for arbitrary strength of field focusing and for all particle velocities. We predict three new, to the best of our knowledge, physical effects: (1) focusing-dependent reversal of PMF, (2) non-relativistic reversal of PMF, and (3) non-reciprocity of PMF for weakly relativistic particle velocities.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2093-2096"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630728","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
Tailoring directivity of two-photon spontaneous emission using plasmonic nanoantennas.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.539545
Steve Smeets, Bjorn Maes, Gilles Rosolen
{"title":"Tailoring directivity of two-photon spontaneous emission using plasmonic nanoantennas.","authors":"Steve Smeets, Bjorn Maes, Gilles Rosolen","doi":"10.1364/OL.539545","DOIUrl":"https://doi.org/10.1364/OL.539545","url":null,"abstract":"<p><p>We report nanoantenna designs that emit entangled photons of distinct energy from two-photon spontaneous emission (TPSE) in different far-field directions with high quantum efficiency. To model the designs, we use a framework that computes the TPSE spectra of a quantum emitter near arbitrarily shaped nanostructures via the classical computation of the one-photon Purcell factors. A first structure exploits both the dipolar and the quadrupolar mode on a single silver nanorod. A second geometry employs dipolar modes on two perpendicular nanorods. An efficient and directional functionality is useful to develop highly compact, integrated entangled two-photon sources.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1845-1848"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630793","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
Transient chirp reconstruction of an ultrafast electron beam via a tightly focused chirped laser pulse.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.552063
Zhijun Zhang, Shiyi Zhou, Jiansheng Liu
{"title":"Transient chirp reconstruction of an ultrafast electron beam via a tightly focused chirped laser pulse.","authors":"Zhijun Zhang, Shiyi Zhou, Jiansheng Liu","doi":"10.1364/OL.552063","DOIUrl":"https://doi.org/10.1364/OL.552063","url":null,"abstract":"<p><p>Controlling particle beam phase space is essential for producing high-quality, ultrashort electron beams (e-beams) in plasma-based accelerators. Diagnosing the rapidly evolving transient energy chirp during early acceleration remains challenging. We propose what we believe to be a novel method using tightly focused and chirped laser pulses to reconstruct the chirp profile. By analyzing conditions for enhancing divergence modulation and leveraging intrinsic phase correlations in phase space, precise chirp reconstruction is achieved. Additionally, temporal delay between the laser and e-beam is determined via Fourier analysis of the divergence modulation. This method enables attosecond-level precision laser streaking for relativistic ultrashort e-beams, offering a powerful tool for ultrafast electron dynamics diagnosis.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2025-2028"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630814","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
Single-shot fast phase diversity phase retrieval using a Lukosz modal-based synthetic hologram.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.553118
Ming Liu, Bing Dong, Jinping He
{"title":"Single-shot fast phase diversity phase retrieval using a Lukosz modal-based synthetic hologram.","authors":"Ming Liu, Bing Dong, Jinping He","doi":"10.1364/OL.553118","DOIUrl":"https://doi.org/10.1364/OL.553118","url":null,"abstract":"<p><p>A single-shot phase diversity phase retrieval (PDPR) method is proposed utilizing a synthetic computer-generated hologram (CGH). This CGH is designed by synthesizing two phases derived from the decomposition of a complex-amplitude hologram that encodes low-order Lukosz aberration modes. The synthetic CGH introduces multiple phase diversities, enabling the reconstruction of diverse images with high fidelity at the focal plane. Low-order Lukosz modes can be estimated independently by holographic modal wavefront sensing (HMWFS), which provides a good initial phase estimation for PDPR. It is demonstrated by simulation and experiment that the incorporation of HMWFS in PDPR enhances both the convergence speed and the capture range.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1771-1774"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630770","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
Ultrahigh return loss LPFGs fabricated via femtosecond laser direct writing of ultrashort TFBGs.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.555175
Xingyong Li, Tianxin Duan, Ruohui Wang, Fengyi Chen, Xueguang Qiao
{"title":"Ultrahigh return loss LPFGs fabricated via femtosecond laser direct writing of ultrashort TFBGs.","authors":"Xingyong Li, Tianxin Duan, Ruohui Wang, Fengyi Chen, Xueguang Qiao","doi":"10.1364/OL.555175","DOIUrl":"https://doi.org/10.1364/OL.555175","url":null,"abstract":"<p><p>In this study, we propose, for the first time to our knowledge, the use of femtosecond laser direct writing to fabricate ultrashort tilted fiber Bragg gratings (TFBGs) for the development of long-period fiber gratings (LPFGs) with ultrahigh return loss (RL). A series of spectral transmission characteristics of the TFBG-LPFGs, constructed from ultrashort TFBGs, were systematically investigated, focusing on the effects of tilt angles and grating periods. As the tilt angle of the ultrashort gratings increases (from 0° to 10°), the RL of the LPFGs improves to 56.31 dB, representing a reduction of approximately 39.42 dB compared to the LPFG with a 0° tilt angle. Notably, the TFBG-LPFGs, composed of multiple 100 μm ultrashort TFBGs, were fabricated using the femtosecond laser direct writing technology, reducing the fabrication time for a single TFBG-LPFG to approximately 30 s, thereby significantly shortening the overall manufacturing time for LPFGs. High-quality LPFGs with LPFGs with ultrahigh RL (RL > 56.31 dB) demonstrate promising applications across areas such as fiber lasers, optical communications, biosensing, chemical detection, and structural health monitoring.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2053-2056"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630839","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
Hollow optical pin-like beam based Cassegrain system performance enhancement under atmospheric turbulence. 大气湍流条件下基于中空销状光束的卡塞格伦系统性能提升。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.557379
Jinhao Wang, Yuyang Tan, Hui Li, Ming Li, Xida Han, Xianlin Wu, Xudong Lin
{"title":"Hollow optical pin-like beam based Cassegrain system performance enhancement under atmospheric turbulence.","authors":"Jinhao Wang, Yuyang Tan, Hui Li, Ming Li, Xida Han, Xianlin Wu, Xudong Lin","doi":"10.1364/OL.557379","DOIUrl":"https://doi.org/10.1364/OL.557379","url":null,"abstract":"<p><p>Cassegrain system, widely used in laser ranging systems, faces emission efficiency challenges due to central obstruction. Current methods utilizing hollow beams based on orbital angular momentum (OAM) aim to mitigate these effects. However, such beams maintain the hollow structure, leading to an ineffective target illumination. Far-field center-healing hollow beams, such as hollow Gaussian beams (HGBs), can effectively address these problems to ensure a proper target illumination but are distorted by atmospheric turbulence, resulting in a reduced echo intensity. In this study, hollow optical pin-like beams (HOPBs) are experimentally demonstrated for the first time, to the best of our knowledge, with superior turbulence resistance. Based on hollow beams, the emission efficiency of the central obstruction system increases from 72.45% to around 90%. The minimal echo decline of HOPBs is only 15% under moderate turbulence, significantly outperforming HGBs, which experience reductions exceeding 31%. Even under strong turbulence, HOPBs maintain a minimal echo reduction (41.19%). This study highlights the advantages of HOPBs in addressing limitations from both central obstruction and atmospheric turbulence, offering a promising solution for improving the performance of laser ranging systems.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2089-2092"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630626","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-optical-path coded aperture compressive temporal imaging. 双光路编码孔径压缩时空成像。
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.555833
Ge Wang, Xing Liu, Xin Yuan
{"title":"Dual-optical-path coded aperture compressive temporal imaging.","authors":"Ge Wang, Xing Liu, Xin Yuan","doi":"10.1364/OL.555833","DOIUrl":"https://doi.org/10.1364/OL.555833","url":null,"abstract":"<p><p>Coded aperture compressive temporal imaging (CACTI) enables the capture of complex dynamic scenes in a single exposure. In this Letter, we introduce a dual-optical-path (DoP) system with conjugate masks employing a single digital micromirror device (DMD) to simultaneously capture the original and complementary measurements to enhance the reconstruction quality. Our findings demonstrate that combining these measurements improves spatial resolution, while their differential values provide temporal information and cancel out noise. Based on this, we build a Noise-Robust Network with Spatial and Temporal Information Enhancement (NRST) as the reconstruction algorithm, which increases accuracy and robustness against noise. Both experimental and simulation results verify the proposed DoP-CACTI system's significant noise robustness and spatiotemporal enhancement properties.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1865-1868"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630670","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
Turbulence effects in frozen waves: experimental generation and analysis via holographic techniques.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.547691
George B Reis, Marcos R R Gesualdi
{"title":"Turbulence effects in frozen waves: experimental generation and analysis via holographic techniques.","authors":"George B Reis, Marcos R R Gesualdi","doi":"10.1364/OL.547691","DOIUrl":"https://doi.org/10.1364/OL.547691","url":null,"abstract":"<p><p>In this Letter, we present the characterization of the effect of atmospheric turbulence on frozen waves (FWs) using holographic techniques. Frozen waves are diffraction-resistant optical beams obtained by superposing co-propagating Bessel beams, achieving efficient shaping of their shape. Based on this, we developed a holographic optical system for the generation and characterization of frozen waves under conditions of turbulence effects. Using this setup, we demonstrate how these frozen waves propagate longitudinally, the transverse intensity profiles and phase map, without and with turbulence. These results indicate that frozen waves are promising for optical communication systems and characterization of turbulent media, due to its non-diffractive properties and the control of its longitudinal propagation and transverse profile properties.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"2097-2100"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630819","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
Voltage-controlled holography mediated with the metal ions sandwiched in TiO2/FTO electrodes.
IF 3.1 2区 物理与天体物理
Optics letters Pub Date : 2025-03-15 DOI: 10.1364/OL.541394
Xin Li, Shencheng Fu, Jingying Miao, Xin Guo, Xintong Zhang, Zhongqiang Wang, Haiyang Xu, Yichun Liu
{"title":"Voltage-controlled holography mediated with the metal ions sandwiched in TiO<sub>2</sub>/FTO electrodes.","authors":"Xin Li, Shencheng Fu, Jingying Miao, Xin Guo, Xintong Zhang, Zhongqiang Wang, Haiyang Xu, Yichun Liu","doi":"10.1364/OL.541394","DOIUrl":"https://doi.org/10.1364/OL.541394","url":null,"abstract":"<p><p>Combining multiple physical fields to achieve on-demand signal conversion is essential. Optical manipulation based on holography, especially electric field-driven holography, can promote efficient information processing. However, there is a lack of a platform that can effectively connect optical recording/reading with electric field. Herein, we construct a photoelectrochemical reaction system with the metal ions sandwiched in TiO<sub>2</sub>/FTO electrodes, which exhibits voltage-controlled holographic plasticity. The hysteresis of ion balance under photoelectric activation leads to switchable long-/short-term hologram memory with light intensity dependence. The enhancement of holographic visual information can be achieved through periodic electrical stimulation. This work provides a potential platform for optoelectrical memory devices and dynamic holographic displays.</p>","PeriodicalId":19540,"journal":{"name":"Optics letters","volume":"50 6","pages":"1807-1810"},"PeriodicalIF":3.1,"publicationDate":"2025-03-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143630851","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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