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Intrapulse coherence degradation suppressing method of echo signal in coherent lidar 相干激光雷达回波信号脉冲内相干衰减抑制方法
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.071201
Haisheng Cong, Jianfeng Sun, Zhiyong Lu, Hongyu He, Weijie Ren, Yuxin Jiang, Lingling Xu, Chaoyang Li, Longkun Zhang, Zhengwei Zhang
{"title":"Intrapulse coherence degradation suppressing method of echo signal in coherent lidar","authors":"Haisheng Cong, Jianfeng Sun, Zhiyong Lu, Hongyu He, Weijie Ren, Yuxin Jiang, Lingling Xu, Chaoyang Li, Longkun Zhang, Zhengwei Zhang","doi":"10.3788/col202321.071201","DOIUrl":"https://doi.org/10.3788/col202321.071201","url":null,"abstract":"Aiming at coherence degradation during target detection, a suppressing method based on frequency-modulated continuous wave coherent lidar is proposed. Combined with a random iteration algorithm, a long-pulse echo signal with coherent degradation is matched with random phase noise of a certain frequency and achieves coherence restoration. Simulation and field experiment results show that this proposed method can recover the intrapulse coherence in long-pulse echo signals. In addition, for the real target echo signal at 4.2 and 19.8 km, the peak signal-to-noise ratio processed by this method is increased by 0.35 times and 4 times after pulse compression, respectively.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84934657","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
Compact in situ microscope for photoelectron spectroscopy via two-mirror reflection 紧凑的原位显微镜光电子能谱通过双镜反射
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.061101
Chenyang Yue, Hong Jiang, Tianzhi Li, Siyan Yao, Shengyue Zeng, Xiaojun Xu, Chaofan Zhang
{"title":"Compact in situ microscope for photoelectron spectroscopy via two-mirror reflection","authors":"Chenyang Yue, Hong Jiang, Tianzhi Li, Siyan Yao, Shengyue Zeng, Xiaojun Xu, Chaofan Zhang","doi":"10.3788/col202321.061101","DOIUrl":"https://doi.org/10.3788/col202321.061101","url":null,"abstract":"Photoelectron spectroscopy is a powerful tool in characterizing the electronic structure of materials. To investigate the specific region of interest with high probing efficiency, in this work we propose a compact insitumicroscope to assist photoelectron spectroscopy. The configuration of long objective distance of 200 mm with two-mirror reflection has been introduced. Large magnification of 5 × to 100 × , lateral resolution of 4.08 μ m, and longitudinal resolution of 4.49 μ m have been achieved. Meanwhile, the testing result shows larger focal depth of this insituoptical microscope. Similar configu-rations could also be applied to other electronic microscopes to improve their probing capability.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87272686","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
Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy 激光波长调制光谱法直接测量和诊断NOx化学反应动力学的初步研究
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.011202
Yongjian Li, Shuai Zhang, Jinyi Li, Xiaotao Yang, Yunfei Meng, Xu Liu, Z. Du
{"title":"Preliminary study on direct measurements and diagnostics for chemical reaction dynamics of NOx by using laser wavelength modulation spectroscopy","authors":"Yongjian Li, Shuai Zhang, Jinyi Li, Xiaotao Yang, Yunfei Meng, Xu Liu, Z. Du","doi":"10.3788/col202321.011202","DOIUrl":"https://doi.org/10.3788/col202321.011202","url":null,"abstract":"Studies on the kinetics of gas-phase chemical reactions currently rely on calculations or simulations and lack simple, fast, and accurate direct measurement methods. We developed a tunable laser molecular absorption spectroscopy measurement system to achieve direct measurements of such reactions by using wavelength modulated spectroscopy and performed online measurements and diagnostics of molecular concentration, reaction temperature, and pressure change during the redox reaction of ozone with nitrogen oxides (NO x ) with 0.1 s temporal resolution. This study provides a promising diagnostic tool for studying gas-phase chemical reaction kinetics.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"87374118","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: 2
Surpassing the standard quantum limit of optical imaging via deep learning 通过深度学习超越光学成像的标准量子极限
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.082701
Miao Cai, Zhi-Xiang Li, Hao Wu, Ya-Ping Ruan, Lei Tang, Jiangshan Tang, Ming-Yuan Chen, Han Zhang, K. Xia, M. Xiao, Yanqing Lu
{"title":"Surpassing the standard quantum limit of optical imaging via deep learning","authors":"Miao Cai, Zhi-Xiang Li, Hao Wu, Ya-Ping Ruan, Lei Tang, Jiangshan Tang, Ming-Yuan Chen, Han Zhang, K. Xia, M. Xiao, Yanqing Lu","doi":"10.3788/col202321.082701","DOIUrl":"https://doi.org/10.3788/col202321.082701","url":null,"abstract":"The sensitivity of optical measurement is ultimately constrained by the shot noise to the standard quantum limit. It has become a common concept that beating this limit requires quantum resources. A deep-learning neural network free of quantum principle has the capability of removing classical noise from images, but it is unclear in reducing quantum noise. In a coincidence-imaging experiment, we show that quantum-resource-free deep learning can be exploited to surpass the standard quantum limit via the photon-number-dependent nonlinear feedback during training. Using an effective classical light with photon flux of about 9 × 10 4 photons per second, our deep-learning-based scheme achieves a 14 dB improvement in signal-to-noise ratio with respect to the standard quantum limit.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82749335","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
Spectral manipulation in a high-power ultrafast fiber laser system generating ultrashort pulses with GHz repetition rate 高功率超快光纤激光系统的频谱处理，产生GHz重复频率的超短脉冲
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.091401
Yingtao Zhang, Zihao Li, Tianxi Wang, Hao Xiu, Chiyi Wei, Luyi Wang, Molei Hao, Xiaoming Wei, Zhong-zhu Yang
{"title":"Spectral manipulation in a high-power ultrafast fiber laser system generating ultrashort pulses with GHz repetition rate","authors":"Yingtao Zhang, Zihao Li, Tianxi Wang, Hao Xiu, Chiyi Wei, Luyi Wang, Molei Hao, Xiaoming Wei, Zhong-zhu Yang","doi":"10.3788/col202321.091401","DOIUrl":"https://doi.org/10.3788/col202321.091401","url":null,"abstract":"In this work, we demonstrate the spectral manipulation in an ultrafast fiber laser system that generates ultrashort pulses with a repetition rate of 1.2 GHz and two switchable modes — a 1064-nm fundamental laser mode with a maximum output power of 66.6 W, and a 1125-nm Raman laser mode with a maximum output power of 17.23 W. The pulse width, beam quality, and power stability are carefully characterized. We also investigate a method to switch between the two modes by manipulating the duty cycle of the modulation signal. It is anticipated that this bi-mode ultrafast fiber laser system can be a promising ultrafast laser source for frontier applications, such as micromachining, bioimaging, and spectroscopy.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86979549","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
Controlled generation of order-switchable cylindrical vector beams from a Nd:YAG laser 由Nd:YAG激光器可控地产生顺序可切换的圆柱形矢量光束
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.101401
Longyang Cao, Mingming Zhang, Jiantai Dou, Jiang Zhao, Youyou Hu, Bo Li
{"title":"Controlled generation of order-switchable cylindrical vector beams from a Nd:YAG laser","authors":"Longyang Cao, Mingming Zhang, Jiantai Dou, Jiang Zhao, Youyou Hu, Bo Li","doi":"10.3788/col202321.101401","DOIUrl":"https://doi.org/10.3788/col202321.101401","url":null,"abstract":"We reported and demonstrated a solid-state laser to achieve controlled generation of order-switchable cylindrical vector beams (CVBs). In the cavity, a group of vortex wave plates (VWPs) with two quarter-wave plates between the VWPs was utilized to achieve mode conversion and order-switch of CVBs. By utilizing two VWPs of 1 st and 3 rd order, the 2 nd and 4 th order CVBs were obtained, with mode purities of 96.8% and 94.8%, and sloping efficiencies of 4.45% and 3.06%, respectively. Furthermore, by applying three VWPs of 1 st , 2 nd and 3 rd order, the mode-switchable Gaussian beam, 2 nd , 4 th and 6 th order CVBs were generated.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77520579","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
Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser 双波长量子级联激光器的室温连续波工作
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.011408
Y. Guan, Ruixuan Sun, N. Zhuo, Xiyu Lu, Jinchuan Zhang, S. Zhai, Jun-qi Liu, Shuman Liu, Lijun Wang, Feng-qi Liu
{"title":"Room temperature continuous-wave operation of a dual-wavelength quantum cascade laser","authors":"Y. Guan, Ruixuan Sun, N. Zhuo, Xiyu Lu, Jinchuan Zhang, S. Zhai, Jun-qi Liu, Shuman Liu, Lijun Wang, Feng-qi Liu","doi":"10.3788/col202321.011408","DOIUrl":"https://doi.org/10.3788/col202321.011408","url":null,"abstract":"We report on the design and fabrication of a dual-wavelength switchable quantum cascade laser (QCL) by optimizing the design of a homogeneous active region and combining superposed distributed feedback gratings. Coaxial, single-mode emissions at two different wavelengths were achieved only through adjusting the bias voltage. Room temperature con-tinuous-wave operation with output powers of above 30 mW and 75 mW was realized for single-mode emission at 7.61 μ m and 7.06 μ m, respectively. The simplified fabrication process and easy wavelength control of our designed dual-wavelength QCL make it very attractive for developing miniature multi-species gas sensing systems.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82546437","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
Nonlinearity-induced localization enhancement in Fibonacci-like waveguide arrays [Invited] 非线性诱导的类斐波那契波导阵列的局部化增强[应邀]
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.101301
Li-Cheng Wang, Hongfei Bu, Yang Chen, Zhen-Nan Tian, Xifeng Ren
{"title":"Nonlinearity-induced localization enhancement in Fibonacci-like waveguide arrays [Invited]","authors":"Li-Cheng Wang, Hongfei Bu, Yang Chen, Zhen-Nan Tian, Xifeng Ren","doi":"10.3788/col202321.101301","DOIUrl":"https://doi.org/10.3788/col202321.101301","url":null,"abstract":"Based on the one-dimensional periodic and Fibonacci-like waveguide arrays","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"75305059","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
NH3 laser THz emission under optical pumping by “long” (∼100 µs) CO2 laser pulses “长”(~ 100µs) CO2激光脉冲光泵浦下的NH3激光器太赫兹辐射
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.023701
A. Ionin, I. Kinyaevskiy, Y. Klimachev, A. Y. Kozlov, D. I. Kormashova, A. Kotkov, Y. Mityagin, S. Savinov, A. Sagitova, D. Sinitsyn, M. V. Ionin
{"title":"NH3 laser THz emission under optical pumping by “long” (∼100 µs) CO2 laser pulses","authors":"A. Ionin, I. Kinyaevskiy, Y. Klimachev, A. Y. Kozlov, D. I. Kormashova, A. Kotkov, Y. Mityagin, S. Savinov, A. Sagitova, D. Sinitsyn, M. V. Ionin","doi":"10.3788/col202321.023701","DOIUrl":"https://doi.org/10.3788/col202321.023701","url":null,"abstract":"","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80179811","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: 1
Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems 基于非合作系统快速智能损伤均衡的线性化微波下变频链路
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.023902
Zhiyu Chen, Xin Zhong, Lin Jiang, Jiaxin Xu, Jingxian Liu, Yan Pan, Tao Zhou
{"title":"Linearized microwave downconversion link based on fast and intelligent impairment equalization for noncooperative systems","authors":"Zhiyu Chen, Xin Zhong, Lin Jiang, Jiaxin Xu, Jingxian Liu, Yan Pan, Tao Zhou","doi":"10.3788/col202321.023902","DOIUrl":"https://doi.org/10.3788/col202321.023902","url":null,"abstract":"We experimentally demonstrated the use of intelligent impairment equalization (IIE) for microwave downconversion link linearization in noncooperative systems. Such an equalizer is realized based on an artificial neural network (ANN). Once the training process is completed, the inverse link transfer function can be determined. With the inverse transformation for the detected signal after transmission, the third-order intermodulation distortion components are suppressed significantly without requiring any prior information from an input RF signal. Furthermore, fast training speed is achieved, since the configuration of ANN-based equalizer is simple. Experimental results show that the spurious-free dynamic range of the proposed link is improved to 106.5 dB · Hz 2/3 , which is 11.3 dB higher than that of a link without IIE. Meanwhile, the training epochs reduce to only five, which has the potential to meet the practical engineering requirement.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":null,"pages":null},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76091440","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: 1
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