The self-focusing phenomenon of partially coherent beams (PCBs) was simulated using the complex screen method com-bined with the split-step Fourier method to solve the nonlinear Schrödinger equation. Considering the propagation of Gaussian Schell-model beams in a nonlinear medium as an example, the suppression effects of intensity, propagation distance, and spatial coherence on small-scale self-focusing were demonstrated. Simulations of overall and small-scale self-focusing using this method were compared with the existing literature to demonstrate the validity of the method. This method can numerically analyze the degree of self-focusing in PCBs and advance the study of their nonlinearity
{"title":"Self-focusing of partially coherent beams based on complex screen and split-step Fourier transform methods","authors":"Fanglun Yang, Guowen Zhang, Xiaoqi Zhang, Yanli Zhang, Ruifeng Wang, Jianqiang Zhu","doi":"10.3788/col202321.071901","DOIUrl":"https://doi.org/10.3788/col202321.071901","url":null,"abstract":"The self-focusing phenomenon of partially coherent beams (PCBs) was simulated using the complex screen method com-bined with the split-step Fourier method to solve the nonlinear Schrödinger equation. Considering the propagation of Gaussian Schell-model beams in a nonlinear medium as an example, the suppression effects of intensity, propagation distance, and spatial coherence on small-scale self-focusing were demonstrated. Simulations of overall and small-scale self-focusing using this method were compared with the existing literature to demonstrate the validity of the method. This method can numerically analyze the degree of self-focusing in PCBs and advance the study of their nonlinearity","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"23 1","pages":""},"PeriodicalIF":3.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73733168","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}
Pub Date : 2023-01-01DOI: 10.3788/col202321.101401
Longyang Cao, Mingming Zhang, Jiantai Dou, Jiang Zhao, Youyou Hu, Bo Li
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.
{"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":"1 1","pages":""},"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}
Pub Date : 2023-01-01DOI: 10.3788/col202321.023902
Zhiyu Chen, Xin Zhong, Lin Jiang, Jiaxin Xu, Jingxian Liu, Yan Pan, Tao Zhou
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.
{"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":"26 1","pages":""},"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}
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.
{"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":"32 1","pages":""},"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}
Pub Date : 2023-01-01DOI: 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":"134 1","pages":""},"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}
We propose and experimentally demonstrate a high quality (Q)-factor all-silicon bound state in the continuum (BIC) metasurface with an imperforated air-hole array. The metasurface supports two polarization-insensitive BICs originated from guided mode resonances (GMRs) in the frequency range of 0.4 to 0.6 THz, and the measured Q-factors of the two GMRs are as high as 334 and 152, respectively. In addition, the influence of the thickness of the silicon substrate on the two resonances is analyzed in detail. The proposed all-silicon THz metasurface has great potential in the design and application of high-Q metasurfaces.
{"title":"High-Q resonances in terahertz all-silicon metasurface with imperforated air-hole array","authors":"Qing Wang, Pengfei Wang, Jianjun Liu, Fangzhou Shu, Guiming Pan, Zhongwei Jin, Xufeng Jing, Zhi Hong","doi":"10.3788/col202321.113601","DOIUrl":"https://doi.org/10.3788/col202321.113601","url":null,"abstract":"We propose and experimentally demonstrate a high quality (Q)-factor all-silicon bound state in the continuum (BIC) metasurface with an imperforated air-hole array. The metasurface supports two polarization-insensitive BICs originated from guided mode resonances (GMRs) in the frequency range of 0.4 to 0.6 THz, and the measured Q-factors of the two GMRs are as high as 334 and 152, respectively. In addition, the influence of the thickness of the silicon substrate on the two resonances is analyzed in detail. The proposed all-silicon THz metasurface has great potential in the design and application of high-Q metasurfaces.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"17 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":"135448093","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}
Pub Date : 2023-01-01DOI: 10.3788/col202321.100501
Jilian Xu, Zhiyuan Yue, Peiyao Lu, Rui Wu, Kun Jiang, Xiquan Jiang, Shuyun Teng
In light of the powerful light manipulation ability of holographic metasurfaces, optical imaging with wavelength multiplexing and polarization multiplexing is performed in this paper. The metasurface is composed of identical rectangular nanoholes etched in silver film. Three imaging effects, including the in-plane color imaging, three-dimensional wavelength-encrypted imaging, and polarization-multiplexing wavelength-encrypted imaging, are realized. The designed metasurface has compact structure, and the obtained image has lower noise. The simulation and experiment results give the verification. Multiple images, including spatial multiplexing, wavelength multiplexing, and polarization multiplexing, exhibit immense potentialities of metasurfaces, and this work is helpful for expanding the applications of metasurfaces.
{"title":"Wavelength and polarization dual-multiplexed imaging based on holographic metasurfaces","authors":"Jilian Xu, Zhiyuan Yue, Peiyao Lu, Rui Wu, Kun Jiang, Xiquan Jiang, Shuyun Teng","doi":"10.3788/col202321.100501","DOIUrl":"https://doi.org/10.3788/col202321.100501","url":null,"abstract":"In light of the powerful light manipulation ability of holographic metasurfaces, optical imaging with wavelength multiplexing and polarization multiplexing is performed in this paper. The metasurface is composed of identical rectangular nanoholes etched in silver film. Three imaging effects, including the in-plane color imaging, three-dimensional wavelength-encrypted imaging, and polarization-multiplexing wavelength-encrypted imaging, are realized. The designed metasurface has compact structure, and the obtained image has lower noise. The simulation and experiment results give the verification. Multiple images, including spatial multiplexing, wavelength multiplexing, and polarization multiplexing, exhibit immense potentialities of metasurfaces, and this work is helpful for expanding the applications of metasurfaces.","PeriodicalId":10293,"journal":{"name":"Chinese Optics Letters","volume":"1 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":"136054153","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}
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