Advanced Photonics Nexus最新文献_第6页

Relative phase locking of a terahertz laser system configured with a frequency comb and a single-mode laser 用频率梳和单模激光器构成的太赫兹激光系统的相对锁相

Advanced Photonics Nexus Pub Date : 2023-02-24 DOI: 10.1117/1.APN.2.2.026006

Wen Guan, Ziping Li, Shumin Wu, Han Liu, Xuhong Ma, Yiran Zhao, Chenjie Wang, Binbin Liu, Zhenzhen Zhang, Juncheng Cao, Hua Li

{"title":"Relative phase locking of a terahertz laser system configured with a frequency comb and a single-mode laser","authors":"Wen Guan, Ziping Li, Shumin Wu, Han Liu, Xuhong Ma, Yiran Zhao, Chenjie Wang, Binbin Liu, Zhenzhen Zhang, Juncheng Cao, Hua Li","doi":"10.1117/1.APN.2.2.026006","DOIUrl":"https://doi.org/10.1117/1.APN.2.2.026006","url":null,"abstract":"Abstract. Stable operation is one of the most important requirements for a laser source for high-precision applications. Many efforts have been made to improve the stability of lasers by employing various techniques, e.g., electrical and/or optical injection and phase locking. However, these techniques normally involve complex experimental facilities. Therefore, an easy implementation of the stability evaluation of a laser is still challenging, especially for lasers emitting in the terahertz (THz) frequency range because the broadband photodetectors and mature locking techniques are limited. In this work, we propose a simple method, i.e., relative phase locking, to quickly evaluate the stability of THz lasers without a need of a THz local oscillator. The THz laser system consists of a THz quantum cascade laser (QCL) frequency comb and a single-mode QCL. Using the single-mode laser as a fast detector, heterodyne signals resulting from the beating between the single-mode laser and the comb laser are obtained. One of the heterodyne beating signals is selected and sent to a phase-locked loop (PLL) for implementing the relative phase locking. Two kinds of locks are performed by feeding the output error signal of the PLL, either to the comb laser or to the single-mode laser. By analyzing the current change and the corresponding frequency change of the PLL-controlled QCL in each phase-locking condition, we, in principle, are able to experimentally compare the stability of the emission frequency of the single-mode QCL (fs) and the carrier envelope offset frequency (fCEO) of the QCL comb. The experimental results reveal that the QCL comb with the repetition frequency injection locked demonstrates much higher stability than the single-mode laser. The work provides a simple heterodyne scheme for understanding the stability of THz lasers, which paves the way for the further locking of the lasers and their high-precision applications in the THz frequency range.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127169339","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Large-scale single-crystal blue phase through holography lithography 大规模单晶蓝相通过全息光刻

Advanced Photonics Nexus Pub Date : 2023-02-11 DOI: 10.1117/1.APN.2.2.026004

Xiaowan Xu, Jiawei Wang, Yanjun Liu, D. Luo

{"title":"Large-scale single-crystal blue phase through holography lithography","authors":"Xiaowan Xu, Jiawei Wang, Yanjun Liu, D. Luo","doi":"10.1117/1.APN.2.2.026004","DOIUrl":"https://doi.org/10.1117/1.APN.2.2.026004","url":null,"abstract":"Abstract. The blue phase, which emerges between cholesteric and isotropic phases within a three-dimensional periodical superstructure, is of great significance in display and photonic applications. The crystalline orientation plays an important role in the macroscopic performance of the blue phase, where the single crystal shows higher uniformity over the polydomain and monodomain, resulting in higher Bragg reflection intensity, lower hysteresis, and lower driving voltage. However, currently reported methods of forming a single-crystal blue phase based on thermal controlling or e-beam lithography are quite time-consuming or expensive for large-scale fabrication, especially in the centimeter range, thus hindering the broad practical applications of single-crystal blue-phase-based photonic devices. Herein, a strategy to fabricate a large scale single crystalline blue-phase domain using holography lithography is proposed. Defect-free single-crystal domains both in blue phase I and blue phase II with a desired orientation of over 1 cm2 are fabricated based on a nanopatterned grating with periodic homeotropic and degenerate parallel anchoring, with colors from red and green to blue. This holography lithography-assisted strategy for fabrication of a large-scale single-crystal blue phase provides a time-saving and low-cost method for a defect-free single crystalline structure, leading to broad applications in liquid crystal displays, laser devices, adaptive optics elements, and electro-optical devices.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129259562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Evolution on spatial patterns of structured laser beams: from spontaneous organization to multiple transformations 结构激光束空间模式的演化:从自发组织到多重转换

Advanced Photonics Nexus Pub Date : 2023-02-06 DOI: 10.1117/1.APN.2.2.024001

Xin Wang, Zilong Zhang, X. Fu, Adnan Khan, Suyi Zhao, Yuan Gao, Yuchen Jie, Wei He, Xiaotian Li, Qiang Liu, Changming Zhao

{"title":"Evolution on spatial patterns of structured laser beams: from spontaneous organization to multiple transformations","authors":"Xin Wang, Zilong Zhang, X. Fu, Adnan Khan, Suyi Zhao, Yuan Gao, Yuchen Jie, Wei He, Xiaotian Li, Qiang Liu, Changming Zhao","doi":"10.1117/1.APN.2.2.024001","DOIUrl":"https://doi.org/10.1117/1.APN.2.2.024001","url":null,"abstract":"Abstract. Spatial patterns are a significant characteristic of lasers. The knowledge of spatial patterns of structured laser beams is rapidly expanding, along with the progress of studies on laser physics and technology. Particularly in the last decades, owing to the in-depth attention on structured light with multiple degrees of freedom, the research on spatial and spatiotemporal structures of laser beams has been promptly developed. Such beams have hatched various breakthroughs in many fields, including imaging, microscopy, metrology, communication, optical trapping, and quantum information processing. Here, we would like to provide an overview of the extensive research on several areas relevant to spatial patterns of structured laser beams, from spontaneous organization to multiple transformations. These include the early theory of beam pattern formation based on the Maxwell–Bloch equations, the recent eigenmodes superposition theory based on the time-averaged Helmholtz equations, the beam patterns extension of ultrafast lasers to the spatiotemporal beam structures, and the structural transformations in the nonlinear frequency conversion process of structured beams.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"27 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114734999","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","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 monitoring of polarization state deviations with dielectric metasurfaces 电介质超表面极化状态偏差的实时监测

Advanced Photonics Nexus Pub Date : 2023-02-02 DOI: 10.1117/1.APN.2.2.026003

Shaun Lung, Jihua Zhang, Kai Wang, A. Sukhorukov

引用次数: 2

Nondiffractive three-dimensional polarization features of optical vortex beams 光学涡旋光束的非衍射三维偏振特性

Advanced Photonics Nexus Pub Date : 2023-01-17 DOI: 10.1117/1.APN.2.2.026001

A. Afanasev, Jack J. Kingsley-Smith, F. J. Rodríguez-Fortuño, A. Zayats

引用次数: 1

Vortex-induced quasi-shear polaritons 旋涡诱导的准剪切极化子

Advanced Photonics Nexus Pub Date : 2023-01-03 DOI: 10.1117/1.apn.2.1.015001

Shuwen Xue, Yali Zeng, Sicen Tao, T. Hou, Shan Zhu, Chuanjie Hu, Huanyang Chen

引用次数: 3

On-chip tunable parity‐time symmetric optoelectronic oscillator 片上可调谐奇偶时间对称光电振荡器

Advanced Photonics Nexus Pub Date : 2023-01-01 DOI: 10.1117/1.APN.2.1.016004

Lin Wang, Xi Xiao, Luoqiu Xu, Yifan Liu, Yu Chen, Yu Yu, Xinliang Zhang

{"title":"On-chip tunable parity‐time symmetric optoelectronic oscillator","authors":"Lin Wang, Xi Xiao, Luoqiu Xu, Yifan Liu, Yu Chen, Yu Yu, Xinliang Zhang","doi":"10.1117/1.APN.2.1.016004","DOIUrl":"https://doi.org/10.1117/1.APN.2.1.016004","url":null,"abstract":"Abstract. Parity‐time (PT) symmetry breaking offers mode selection capability for facilitating single‐mode oscillation in the optoelectronic oscillator (OEO) loop. However, most OEO implementations depend on discrete devices, which impedes proliferation due to size, weight, power consumption, and cost. In this work, we propose and experimentally demonstrate an on-chip tunable PT‐symmetric OEO. A tunable microwave photonic filter, a PT‐symmetric mode‐selective architecture, and two photodetectors are integrated on a silicon‐on‐insulator chip. By exploiting an on‐chip Mach–Zehnder interferometer to match the gain and loss of two mutually coupled optoelectronic loops, single‐mode oscillation can be obtained. In the experiment, the oscillation frequency of the on-chip tunable PT‐symmetric OEO can be tuned from 0 to 20 GHz. To emulate the integrated case, the OEO loop length is minimized, and no extra-long fiber is used in the experiment. When the oscillation frequency is 13.67 GHz, the single‐sideband phase noise at 10-kHz offset frequency is −80.96 dBc / Hz and the side mode suppression ratio is 46 dB. The proposed on-chip tunable PT‐symmetric OEO significantly reduces the footprint of the system and enhances mode selection.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"75 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115271914","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Confocal rescan structured illumination microscopy for real-time deep tissue imaging with superresolution 用于超分辨率实时深层组织成像的共聚焦重扫描结构照明显微镜

Advanced Photonics Nexus Pub Date : 2023-01-01 DOI: 10.1117/1.APN.2.1.016009

Shuhao Shen, E. Du, Miao Zhang, Y. Wen, Kai Long, A. Qiu, Nanguang Chen

引用次数: 1

Ultracompact phase plate fabricated by femtosecond laser two-photon polymerization for generation of Mathieu--Gauss beams 飞秒激光双光子聚合制备用于产生马修-高斯光束的超紧凑相板

Advanced Photonics Nexus Pub Date : 2023-01-01 DOI: 10.1117/1.APN.2.1.016011

Jue Wang, Chengkun Cai, Tianhao Fu, Kangrui Wang, Yize Liang, Jian Wang

引用次数: 0

Detection of trace metals in water by filament- and plasma-grating-induced breakdown spectroscopy 用灯丝和等离子体光栅诱导击穿光谱法检测水中痕量金属

Advanced Photonics Nexus Pub Date : 2023-01-01 DOI: 10.1117/1.APN.2.1.016008

Mengyun Hu, Fangfang Li, Shencheng Shi, Yu Qiao, Jinman Ge, Xiaojun Li, Heping Zeng

{"title":"Detection of trace metals in water by filament- and plasma-grating-induced breakdown spectroscopy","authors":"Mengyun Hu, Fangfang Li, Shencheng Shi, Yu Qiao, Jinman Ge, Xiaojun Li, Heping Zeng","doi":"10.1117/1.APN.2.1.016008","DOIUrl":"https://doi.org/10.1117/1.APN.2.1.016008","url":null,"abstract":"Abstract. Filament- and plasma-grating-induced breakdown spectroscopy (F-GIBS) was demonstrated as an efficient technique for sensitive detection of metals in water, where plasma gratings were established through synchronized nonlinear interaction of two noncollinear filaments and an additional filament was generated with another fs laser beam propagating along their bisector. A water jet was constructed vertically to the three co-planar filaments, overcoming side effects from violent plasma explosion and bubble generation. Three distinct regimes of different mechanisms were validated for nonlinear couplings of the third filament with plasma gratings. As the third filament was temporally overlapped with the two noncollinear filaments in the interaction zone, all the three filaments participated in synchronous nonlinear interaction and plasma grating structures were altered by the addition of the third filament. As the third filament was positively or negatively delayed, the as-formed plasma gratings were elongated by the delayed third filament, or plasma gratings were formed in the presence of plasma expansion of the ahead third filament, respectively. Using F-GIBS for trace metal detection in water, significant spectral line enhancements were observed.","PeriodicalId":223078,"journal":{"name":"Advanced Photonics Nexus","volume":"95 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123541396","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0