{"title":"Optical digital-to-analog conversion based on weighted fiber coupler","authors":"Zhaoyun Li, Yaxian Fan, Zhiyong Tao, H. Liu, Haiyue Pang, Yukun Zhang","doi":"10.1117/12.2603082","DOIUrl":"https://doi.org/10.1117/12.2603082","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125160551","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}
The coupled nanosecond laser processing system was used for processing 6061 aluminum alloy in this paper. At first, we explored the relationship between laser processing parameters, such as laser power, laser repetition frequency, as well as scanning speed, and the processed surface quality for 6061 aluminum alloy plate sample. The optimal laser parameters were determined by the experiment of the flat plate sample processing, and then the paths of laser processing were designed and planned on the aluminum alloy with curved surface to explore the influence of curvature on the surface quality. The results show that the new processing technology of coupled nanosecond laser polishing could obtain good surface quality. The optimal laser processing parameters are average laser power of 5W, scanning speed of 500mm/min, and repetition frequency of 10kHz, which could reduce the surface roughness by 43%. In addition, the surface quality of the aluminum alloy is closer to the original surface as the curvature increased. And the convex surface has a lower surface roughness than the concave surface because the spot shape is different at different curvature positions. The coupled laser polishing process provides theoretical and technological support for the high-quality machining of 6061 aluminum alloy in this study.
{"title":"Research on polishing process of aluminum alloy curved surface by nanosecond laser beam coupling","authors":"Xianyou Chen, Xiaoxiao Chen, Yuan Li, Wenwu Zhang, X. Shen","doi":"10.1117/12.2603072","DOIUrl":"https://doi.org/10.1117/12.2603072","url":null,"abstract":"The coupled nanosecond laser processing system was used for processing 6061 aluminum alloy in this paper. At first, we explored the relationship between laser processing parameters, such as laser power, laser repetition frequency, as well as scanning speed, and the processed surface quality for 6061 aluminum alloy plate sample. The optimal laser parameters were determined by the experiment of the flat plate sample processing, and then the paths of laser processing were designed and planned on the aluminum alloy with curved surface to explore the influence of curvature on the surface quality. The results show that the new processing technology of coupled nanosecond laser polishing could obtain good surface quality. The optimal laser processing parameters are average laser power of 5W, scanning speed of 500mm/min, and repetition frequency of 10kHz, which could reduce the surface roughness by 43%. In addition, the surface quality of the aluminum alloy is closer to the original surface as the curvature increased. And the convex surface has a lower surface roughness than the concave surface because the spot shape is different at different curvature positions. The coupled laser polishing process provides theoretical and technological support for the high-quality machining of 6061 aluminum alloy in this study.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"54 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121049891","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}
Water-guided laser is a processing technology that uses a high-pressure water jet to guide the laser to act on the processing surface to complete material removal, which has the advantages of large processing depth, small heat-affected zone and good processing quality. However, the coupling efficiency of the beam in the water jet affects the processing quality. The coupling efficiency was found to be affected by the laminar flow quality of the water jet, which has an irregular shape on the surface of the water column ejected from the nozzle. This paper investigates the factors affecting the beam propagation quality and provides an in-depth study of the laminar surface state affecting the laminar light transmission. The laser energy distribution in laminar flow in different surface morphology was simulated with ZEMAX optical simulation software. The influence law on the light transmission efficiency of water jet is obtained, the more complex the surface morphology of the water jet, the worse the light transfer efficiency and the more serious the power loss. Lastly, the reasons affecting the laminar flow condition are analyzed, theoretical support is provided for efficient laminar flow coupling light transmission by water-guided laser.
{"title":"Simulation of energy distribution of water guided laser in different morphological water column","authors":"Huan Long, Guangyi Zhang, Chunhai Guo, Yaowen Wu, Yang Chao, Zebin Pan, Wenwu Zhang","doi":"10.1117/12.2603050","DOIUrl":"https://doi.org/10.1117/12.2603050","url":null,"abstract":"Water-guided laser is a processing technology that uses a high-pressure water jet to guide the laser to act on the processing surface to complete material removal, which has the advantages of large processing depth, small heat-affected zone and good processing quality. However, the coupling efficiency of the beam in the water jet affects the processing quality. The coupling efficiency was found to be affected by the laminar flow quality of the water jet, which has an irregular shape on the surface of the water column ejected from the nozzle. This paper investigates the factors affecting the beam propagation quality and provides an in-depth study of the laminar surface state affecting the laminar light transmission. The laser energy distribution in laminar flow in different surface morphology was simulated with ZEMAX optical simulation software. The influence law on the light transmission efficiency of water jet is obtained, the more complex the surface morphology of the water jet, the worse the light transfer efficiency and the more serious the power loss. Lastly, the reasons affecting the laminar flow condition are analyzed, theoretical support is provided for efficient laminar flow coupling light transmission by water-guided laser.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121221760","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}
{"title":"Recognition of underwater moving submarine based on lidar intensity image","authors":"Wei Zhao, Sining Li, Zhenshan Qiu, Jianfeng Sun, Yinbo Zhang, Hailong Zhang","doi":"10.1117/12.2602013","DOIUrl":"https://doi.org/10.1117/12.2602013","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116828158","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}
With the rapid development and widespread application of microsatellites,its on-orbit propulsion technology has attracted much attention.This article focuses on the Laser-sustained pulsed plasma thruster, a new space micropropulsion technology.Start with prototype design and production, and test platform construction, then briefly analyze the principle and characteristics of the technology, and focus on the stability of the technology to carry out test analysis. In the test set up different test conditionssuch as laser ignition energy 22.6mJ, 112.2mJ, 222.4mJ, discharge voltage 2000V, 1500V, 1000V, etc.Evaluate the stability of the prototype from two aspects: quantitative (discharge current, generated element impulse) and qualitative (surface contamination degree of working fluid),and based on the evaluation results, analyze the reasons briefly and put forward suggestions for improvement.to provide a basis for future Laser-sustained pulsed plasma thruster technology research and development and improvement.
{"title":"Research on stability of laser-sustained pulsed plasma thruster","authors":"yuhao zhan, Nanlei Li, Weijing Zhou","doi":"10.1117/12.2601649","DOIUrl":"https://doi.org/10.1117/12.2601649","url":null,"abstract":"With the rapid development and widespread application of microsatellites,its on-orbit propulsion technology has attracted much attention.This article focuses on the Laser-sustained pulsed plasma thruster, a new space micropropulsion technology.Start with prototype design and production, and test platform construction, then briefly analyze the principle and characteristics of the technology, and focus on the stability of the technology to carry out test analysis. In the test set up different test conditionssuch as laser ignition energy 22.6mJ, 112.2mJ, 222.4mJ, discharge voltage 2000V, 1500V, 1000V, etc.Evaluate the stability of the prototype from two aspects: quantitative (discharge current, generated element impulse) and qualitative (surface contamination degree of working fluid),and based on the evaluation results, analyze the reasons briefly and put forward suggestions for improvement.to provide a basis for future Laser-sustained pulsed plasma thruster technology research and development and improvement.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129943119","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}
Terbium aluminum garnet(TAG) is an excellent magneto-optic(MO) material with high Verdet constant and high thermal conductivity, but it is difficult to grow large-size TAG crystal due to its incongruent melting characteristic. By fabricating TAG ceramics through solid-state sintering, this problem can be effectively circumvented. In this paper, the recent research progress on the optimization of the optical quality and MO properties of TAG ceramics were reviewed. The high power performance of TAG ceramics, including their thermal depolarization effect, MO figure of merit, etc., were summarized and compared in details. Except for scattering loss, the key role of the microstructure of TAG ceramics, especially for the uniformity and size distribution of grains, in the generation of thermal depolarization was revealed and discussed, which provides a guideline to the fabrication of TAG ceramic with high MO figure of merit.
{"title":"TAG magneto-optic ceramics and its application in high power optical isolators","authors":"Jie Chen, Shengming Zhou","doi":"10.1117/12.2603237","DOIUrl":"https://doi.org/10.1117/12.2603237","url":null,"abstract":"Terbium aluminum garnet(TAG) is an excellent magneto-optic(MO) material with high Verdet constant and high thermal conductivity, but it is difficult to grow large-size TAG crystal due to its incongruent melting characteristic. By fabricating TAG ceramics through solid-state sintering, this problem can be effectively circumvented. In this paper, the recent research progress on the optimization of the optical quality and MO properties of TAG ceramics were reviewed. The high power performance of TAG ceramics, including their thermal depolarization effect, MO figure of merit, etc., were summarized and compared in details. Except for scattering loss, the key role of the microstructure of TAG ceramics, especially for the uniformity and size distribution of grains, in the generation of thermal depolarization was revealed and discussed, which provides a guideline to the fabrication of TAG ceramic with high MO figure of merit.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128231081","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}
{"title":"Review of terahertz nonreciprocal devices based on gyrotropic material InSb","authors":"Zhiyu Tan, F. Fei, Chang Shengjiang","doi":"10.1117/12.2602858","DOIUrl":"https://doi.org/10.1117/12.2602858","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128269030","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}
Jianbo Wang, C. Yin, C. Shi, Hanping Wang, S. Cai, Tong Zhang
Accurate iodine spectroscopy measurement plays important role in wavelength metrology, precise spectrum detection and interferometry measurement. In all the spectrum of iodine, the saturation absorption lines at 633 nm are the most widely used with the iodine stabilized He-Ne laser. Due to its weak output power, it is difficult to directly measure the absolute frequency with femtosecond frequency comb. In this paper, we present a new optical beating note system based on polarization maintaining fibers, which is employed to measure the weak iodine stabilized laser successfully. The experimental results show that a standard deviation of the frequency fluctuation of 12 kHz and a relative stability of 1.4×10-11 at 1 s are obtained, respectively. The reproducibility of the iodine stabilized laser is also studied, and a confident result of 3.8 kHz in peak to peak value is obtained with six months.
{"title":"Absolute wavelength measurement of 633nm iodine stabilized He-Ne laser","authors":"Jianbo Wang, C. Yin, C. Shi, Hanping Wang, S. Cai, Tong Zhang","doi":"10.1117/12.2603069","DOIUrl":"https://doi.org/10.1117/12.2603069","url":null,"abstract":"Accurate iodine spectroscopy measurement plays important role in wavelength metrology, precise spectrum detection and interferometry measurement. In all the spectrum of iodine, the saturation absorption lines at 633 nm are the most widely used with the iodine stabilized He-Ne laser. Due to its weak output power, it is difficult to directly measure the absolute frequency with femtosecond frequency comb. In this paper, we present a new optical beating note system based on polarization maintaining fibers, which is employed to measure the weak iodine stabilized laser successfully. The experimental results show that a standard deviation of the frequency fluctuation of 12 kHz and a relative stability of 1.4×10-11 at 1 s are obtained, respectively. The reproducibility of the iodine stabilized laser is also studied, and a confident result of 3.8 kHz in peak to peak value is obtained with six months.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"102 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124721825","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}
Haiyue Pang, Zhaoyun Li, Jianwei Zheng, Z. Tao, Yaxian Fan
We demonstrate a multi-wavelength Q-switched random fiber laser with the erbium-doped fiber as the gain medium and the Rayleigh scattering as the randomly distributed feedback in a 6 km long single-mode fiber. Q-switched pulses and sub-pulses with different repetition frequencies were generated with the pump power as 182 mW by combining the random cavity resonances and the Q-value modulation effect induced by the stimulated Brillouin scattering and nonlinear multimode interference in the graded-index multimode fiber. The pulse repetition rate increased continuously from 79 kHz to 113 kHz, and the corresponding pulse width exponentially decreased with the continuously increasing pump power, and a shortest pulse width of 1.85 μs was obtained. At the same time, a multi-wavelength spectrum with the equally spaced interval and an optical signal-to-noise ratio of ~31 dB was achieved. This laser has the unique properties different from the conventional resonant cavity lasers, which makes it a very promising light source in optical communication, imaging, and sensing applications.
{"title":"Multi-wavelength Q-switched random fiber laser based on stimulated Brillouin scattering and multimodal interference","authors":"Haiyue Pang, Zhaoyun Li, Jianwei Zheng, Z. Tao, Yaxian Fan","doi":"10.1117/12.2603119","DOIUrl":"https://doi.org/10.1117/12.2603119","url":null,"abstract":"We demonstrate a multi-wavelength Q-switched random fiber laser with the erbium-doped fiber as the gain medium and the Rayleigh scattering as the randomly distributed feedback in a 6 km long single-mode fiber. Q-switched pulses and sub-pulses with different repetition frequencies were generated with the pump power as 182 mW by combining the random cavity resonances and the Q-value modulation effect induced by the stimulated Brillouin scattering and nonlinear multimode interference in the graded-index multimode fiber. The pulse repetition rate increased continuously from 79 kHz to 113 kHz, and the corresponding pulse width exponentially decreased with the continuously increasing pump power, and a shortest pulse width of 1.85 μs was obtained. At the same time, a multi-wavelength spectrum with the equally spaced interval and an optical signal-to-noise ratio of ~31 dB was achieved. This laser has the unique properties different from the conventional resonant cavity lasers, which makes it a very promising light source in optical communication, imaging, and sensing applications.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128154883","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}
Micro/nanostructure with a subwavelength period can be induced on the material surface by femtosecond laser, named as Laser Induced Periodic Surface Structure (LIPSS). The uniform LIPSS structure act as a grating that diffracts light, which can display vivid structural colors when illuminating the surface with white light. Structural color with periodic LIPSS structure has strong angle dependence, depends on the direction of the LIPSS structure, which provided us with a new method to realize multi-direction micro/nanostructure processing. By changing the femtosecond laser polarization, we can get the periodic micro/nanostructures in different directions. The polarization controllable femtosecond fabrication can be used for multi-pattern fabrication. The structural color with polarization sensitivity, different patterns could be observed in different directions. Moreover, different from other coloration methods, structural color has inherent stability, which have potential application in the fields of anti-counterfeiting, information storage and dynamic display. In this letter, we introduce a half wave plate to adjust the polarization state of the laser, and realize femtosecond laser variable polarization processing multi-pattern on a stainless steel foil.
{"title":"Variable polarization processing based on femtosecond laser","authors":"Peichao Wu, Xiaowen Cao, Ling Zhao, Zhihao Chen, Hongbing Yuan, Mina Zhang, Wenwu Zhang","doi":"10.1117/12.2602929","DOIUrl":"https://doi.org/10.1117/12.2602929","url":null,"abstract":"Micro/nanostructure with a subwavelength period can be induced on the material surface by femtosecond laser, named as Laser Induced Periodic Surface Structure (LIPSS). The uniform LIPSS structure act as a grating that diffracts light, which can display vivid structural colors when illuminating the surface with white light. Structural color with periodic LIPSS structure has strong angle dependence, depends on the direction of the LIPSS structure, which provided us with a new method to realize multi-direction micro/nanostructure processing. By changing the femtosecond laser polarization, we can get the periodic micro/nanostructures in different directions. The polarization controllable femtosecond fabrication can be used for multi-pattern fabrication. The structural color with polarization sensitivity, different patterns could be observed in different directions. Moreover, different from other coloration methods, structural color has inherent stability, which have potential application in the fields of anti-counterfeiting, information storage and dynamic display. In this letter, we introduce a half wave plate to adjust the polarization state of the laser, and realize femtosecond laser variable polarization processing multi-pattern on a stainless steel foil.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134410358","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}
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