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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":"5 1","pages":""},"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
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":"13 1","pages":""},"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
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":"232 1","pages":""},"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
Binary diffractive lens with subwavelength focusing for terahertz imaging 用于太赫兹成像的亚波长聚焦的二元衍射透镜
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.030501
Ran Ning, Dayong Wang, L. Rong, Jie Zhao, Yunxin Wang, Shufeng Lin
{"title":"Binary diffractive lens with subwavelength focusing for terahertz imaging","authors":"Ran Ning, Dayong Wang, L. Rong, Jie Zhao, Yunxin Wang, Shufeng Lin","doi":"10.3788/col202321.030501","DOIUrl":"https://doi.org/10.3788/col202321.030501","url":null,"abstract":"The converging lens is one of the key components in high-resolution terahertz imaging. In this Letter, a binary diffractive lens is proposed for the scanning imaging system working at 278.6 GHz, in which a convergent beam with a waist diameter of 0.65 mm is generated, and 1 mm lateral imaging resolution is realized. This low-cost terahertz lens, constituted by concentric rings with different radii, is optimized by stimulated annealing algorithm and fabricated by three-dimensional printing. Compared with the conventional transmissive convex lens, higher resolution and enhanced imaging quality are achieved via smaller focal spot of the illumination beam. This type of lens would promote terahertz imaging closer to practical applications such as nondestructive testing and other scenarios.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"43 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76940924","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
Nonlinear harmonic generation of terahertz waves in a topological valley polaritonic microcavity 拓扑谷极化微腔中太赫兹波的非线性谐波产生
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.081901
Yao Lu, H. Xiong, Yibo Huang, Qiang Wu, Jiwei Qi, Chongpei Pan, Jingjun Xu
{"title":"Nonlinear harmonic generation of terahertz waves in a topological valley polaritonic microcavity","authors":"Yao Lu, H. Xiong, Yibo Huang, Qiang Wu, Jiwei Qi, Chongpei Pan, Jingjun Xu","doi":"10.3788/col202321.081901","DOIUrl":"https://doi.org/10.3788/col202321.081901","url":null,"abstract":"Compact terahertz (THz) devices, especially for nonlinear THz components, have received more and more attention due to their potential applications in THz nonlinearity-based sensing, communications, and computing devices. However, effective means to enhance, control, and confine the nonlinear harmonics of THz waves remain a great challenge for micro-scale THz nonlinear devices. In this work, we have established a technique for nonlinear harmonic generation of THz waves based on phonon polariton-enhanced giant THz nonlinearity in a 2D-topologically protected valley photonic microcavity. Effective THz harmonic generation has been observed in both noncentrosymmetric and centrosymmetric nonlinear materials. These results can provide a valuable reference for the generation and control of THz high-harmonics, thus developing new non-linear devices in the THz regime.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"20 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84755447","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
Thickness dependency of nonlinear optical properties in ITO/Sn composite films ITO/Sn复合薄膜非线性光学特性的厚度依赖性
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.081902
Boyang Nan, R. Hong, Chunxian Tao, Qi Wang, Hui Lin, Zhaoxia Han, Dawei Zhang
{"title":"Thickness dependency of nonlinear optical properties in ITO/Sn composite films","authors":"Boyang Nan, R. Hong, Chunxian Tao, Qi Wang, Hui Lin, Zhaoxia Han, Dawei Zhang","doi":"10.3788/col202321.081902","DOIUrl":"https://doi.org/10.3788/col202321.081902","url":null,"abstract":"In this study, a batch of indium tin oxide (ITO)/Sn composites with different ratios was obtained based on the principle of thermal evaporation by an electron beam. The crystalline structure, surface shape, and optical characterization of the films were researched using an X-ray diffractometer, an atomic force microscope, a UV-Vis-NIR dual-beam spectrophotometer, and an open-hole Z-scan system. By varying the relative thickness ratio of the ITO/Sn bilayer film, tunable nonlinear optical properties were achieved. The nonlinear saturation absorption coefficient β maximum of the ITO/Sn composites is − 10.5 × 10 − 7 cm = W, approximately 21 and 1.72 times more enhanced compared to monolayer ITO and Sn, respectively. Moreover, the improvement of the sample nonlinear performance was verified using finite-difference in temporal domain simulations.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"346 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"79658656","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
Generation of 1.3/1.4 µm random fiber laser by bismuth-doped phosphosilicate fiber 掺铋磷硅酸盐光纤制备1.3/1.4µm随机光纤激光器
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.071401
Hang Wang, Wencheng Jia, Yongjia Yao, Xinyun Yang, M. Melkumov, S. Firstov, A. Lobanov, Zhipeng Dong, Zhengqian Luo
{"title":"Generation of 1.3/1.4 µm random fiber laser by bismuth-doped phosphosilicate fiber","authors":"Hang Wang, Wencheng Jia, Yongjia Yao, Xinyun Yang, M. Melkumov, S. Firstov, A. Lobanov, Zhipeng Dong, Zhengqian Luo","doi":"10.3788/col202321.071401","DOIUrl":"https://doi.org/10.3788/col202321.071401","url":null,"abstract":"We have successfully generated a 1.3/1.4 μ m random fiber laser (RFL) using bismuth (Bi)-doped phosphosilicate fiber. The Bi-doped RFL has shown excellent long-term operational stability with a standard deviation of approximately 0.34% over 1 h at a maximum output power of 549.30 mW, with a slope efficiency of approximately 29.21%. The Bi-doped phosphosilicate fiber offers an emission spectrum ranging from 1.28 to 1.57 μ m, indicating that it can be tuned within this band. Here, we demonstrated a wavelength-tuning fiber laser with a wavelength of 1.3/1.4 μ m, achieved through the using of a fiber Bragg grating or a tunable filter. Compared to traditional laser sources, the RFL reduces the speckle contrast of images by 11.16%. Due to its high stability, compact size, and high efficiency, this RFL is highly promising for use in biomedical imaging, communication, and sensor applications.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81687496","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
Watt-level laser operation of Pr3+:YLF at 696 and 698 nm Pr3+:YLF在696和698 nm处的瓦级激光操作
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.041404
Weihang Cao, Z. Dai, Run Fang, Z. Wang, Yuchen Xue, B. Xiao, Huiying Xu, Z. Cai
{"title":"Watt-level laser operation of Pr3+:YLF at 696 and 698 nm","authors":"Weihang Cao, Z. Dai, Run Fang, Z. Wang, Yuchen Xue, B. Xiao, Huiying Xu, Z. Cai","doi":"10.3788/col202321.041404","DOIUrl":"https://doi.org/10.3788/col202321.041404","url":null,"abstract":"","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"54 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78905130","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
2 kW random fiber laser based on hybrid Yb-Raman gain [Invited] 基于Yb-Raman混合增益的2kw随机光纤激光器[特邀]
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.090004
Jieping Ye, Yang Zhang, Junrui Liang, Xiao Ma, Jiangming Xu, T. Yao, Jin-yong Leng, P. Zhou
{"title":"2 kW random fiber laser based on hybrid Yb-Raman gain [Invited]","authors":"Jieping Ye, Yang Zhang, Junrui Liang, Xiao Ma, Jiangming Xu, T. Yao, Jin-yong Leng, P. Zhou","doi":"10.3788/col202321.090004","DOIUrl":"https://doi.org/10.3788/col202321.090004","url":null,"abstract":"High-power operation is one of the most important research topics surrounding random fiber lasers (RDFLs). Here we optimized the cavity structure and proposed a new scheme based on hybrid gain to address the issue of high-power back-ward light in traditional kilowatt-level RDFLs. Consequently, a record power of 1972 W was achieved while the maximum backward leaked power only reached 0.12 W. The conversion efficiency relative to the laser diode pump power was 68.4%, and the highest spectral purity of the random lasing reached 98.1%. This work may provide a reference for high-power RDFLs, Raman fiber lasers, and long-wavelength Yb-doped fiber lasers.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"9 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83515688","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
Damage resistance of B4C reflective mirror irradiated by X-ray free-electron laser x射线自由电子激光辐照B4C反射镜的抗损伤性
IF 3.5 2区 物理与天体物理
Chinese Optics Letters Pub Date : 2023-01-01 DOI: 10.3788/col202321.023401
Jinyu Cao, Shuhui Li, Yajun Tong, Ming-Dou Tang, Wenbin Li, Qiushi Huang, Huaidong Jiang, Zhanshan Wang
{"title":"Damage resistance of B4C reflective mirror irradiated by X-ray free-electron laser","authors":"Jinyu Cao, Shuhui Li, Yajun Tong, Ming-Dou Tang, Wenbin Li, Qiushi Huang, Huaidong Jiang, Zhanshan Wang","doi":"10.3788/col202321.023401","DOIUrl":"https://doi.org/10.3788/col202321.023401","url":null,"abstract":"In this paper, a simple theoretical model combining Monte Carlo simulation with the enthalpy method is provided to simulate the damage resistance of B 4 C/Si-sub mirror under X-ray free-electron laser irradiation. Two different damage mechanisms are found, dependent on the photon energy. The optimum B 4 C film thickness is determined by studying the dependence of the damage resistance on the film thickness. Based on the optimized film thickness, the damage thresholds are simulated at photon energy of 0.4 – 25 keV and a grazing incidence angle of 2 mrad. It is recommended that the energy range around the Si K-edge should be avoided for safety reasons.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"2 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88284534","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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