As a novel composite processing technology, water guided laser has the advantages of small heat affected zone, good surface quality of the cut surface, strong processing depth capability and small taper compared with the traditional dry laser processing technology. In this paper, the infrared water guided laser processing technology is used to process 7075 aluminum alloy, which has high strength, high toughness and corrosion resistance and is widely used in the fields of aerospace, mechanical equipment. The processing parameters of the infrared water guided laser including the effect of 7075 aluminum alloy on the cutting depth, kerf width and surface quality at different feed speed, number of cutting times and peak power are analyzed to extend the processing method of 7075 aluminum alloy. The distance-power curve was also derived based on the fact that the further the power meter was from the nozzle, the lower the power measured within the water column. The experimental results show that the faster the 7075 aluminum alloy feed speed is, the shallower the cutting depth and the smaller the kerf width is, while the higher the number of cuts and the higher the peak power are, both will result in large cutting depth and kerf width. Finally, high quality cutting through and punching of 3mm aluminum alloy plate is achieved, which provides the theoretical basis for the study to infrared water guided laser.
{"title":"Experimental study on infrared water guided laser cutting of 7075 aluminum alloy","authors":"Zebin Pan, Guangyi Zhang, Chunhai Guo, Yang Chao, Yaowen Wu, Huan Long, Wenwu Zhang","doi":"10.1117/12.2603052","DOIUrl":"https://doi.org/10.1117/12.2603052","url":null,"abstract":"As a novel composite processing technology, water guided laser has the advantages of small heat affected zone, good surface quality of the cut surface, strong processing depth capability and small taper compared with the traditional dry laser processing technology. In this paper, the infrared water guided laser processing technology is used to process 7075 aluminum alloy, which has high strength, high toughness and corrosion resistance and is widely used in the fields of aerospace, mechanical equipment. The processing parameters of the infrared water guided laser including the effect of 7075 aluminum alloy on the cutting depth, kerf width and surface quality at different feed speed, number of cutting times and peak power are analyzed to extend the processing method of 7075 aluminum alloy. The distance-power curve was also derived based on the fact that the further the power meter was from the nozzle, the lower the power measured within the water column. The experimental results show that the faster the 7075 aluminum alloy feed speed is, the shallower the cutting depth and the smaller the kerf width is, while the higher the number of cuts and the higher the peak power are, both will result in large cutting depth and kerf width. Finally, high quality cutting through and punching of 3mm aluminum alloy plate is achieved, which provides the theoretical basis for the study to infrared water guided laser.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"21 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":"128527285","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}
G. Zhang, Yebin Zhang, Kai Wang, Shoubao Han, Zhong Zhou, Chao Li, Lei Wang
{"title":"Sub-aperture field of view mismatch in differential synthetic aperture ladar","authors":"G. Zhang, Yebin Zhang, Kai Wang, Shoubao Han, Zhong Zhou, Chao Li, Lei Wang","doi":"10.1117/12.2602024","DOIUrl":"https://doi.org/10.1117/12.2602024","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"2014 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":"127437315","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}
Lingling Zhang, Tianjiao Shu, Guo-quan Li, Yuanchao Du, Yuan Chen, Xuanjun Zhang, J. Zhang
In order to identify and trace the single silicon wafer, which improved quality control and assists in process improvement, laser marking of silicon wafers had been an industrial standard in semiconductor industry. The traditional laser making had the depth 5-20um and a significant amount of debris. In this paper, the topography quality and the depth the size of the dot were investigated by adjusting laser pulse energy, laser pulse numbers . The results showed that the depth of the dot increases proportionally with laser irradiation energy while there were significant differences in the topography of the dot with different interaction time of laser irradiation. A free-debris laser dot marking process with the depth less than 2um, the height of bump less than 0.6um, the range of diameter of dots from 20um to 100um was achieved.
{"title":"Processing study of laser marking on Si wafer","authors":"Lingling Zhang, Tianjiao Shu, Guo-quan Li, Yuanchao Du, Yuan Chen, Xuanjun Zhang, J. Zhang","doi":"10.1117/12.2603103","DOIUrl":"https://doi.org/10.1117/12.2603103","url":null,"abstract":"In order to identify and trace the single silicon wafer, which improved quality control and assists in process improvement, laser marking of silicon wafers had been an industrial standard in semiconductor industry. The traditional laser making had the depth 5-20um and a significant amount of debris. In this paper, the topography quality and the depth the size of the dot were investigated by adjusting laser pulse energy, laser pulse numbers . The results showed that the depth of the dot increases proportionally with laser irradiation energy while there were significant differences in the topography of the dot with different interaction time of laser irradiation. A free-debris laser dot marking process with the depth less than 2um, the height of bump less than 0.6um, the range of diameter of dots from 20um to 100um was achieved.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"105 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":"134474692","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}
Multiple beam generation and adaptive control plays an important role in the laser propagation applications. The existing approaches are usually mechanical, so they have many limitations in terms of accuracy, bandwidth, and flexibility. In this paper, a kind of dynamic multiple beam forming method based on the fiber laser phased array (FLPA) is proposed. In this method, the FLPA based on the multi-objective optimization algorithm is employed, which can theoretically generate any number of outgoing beams, and dynamically adjust the power of each beam. The numerical simulation experiments based on a 19-cell FLPA were conducted. The results show that two stable outgoing beams of FLPA can be generated after about 200 iterations, and the power distribution error of the two beams can reach less than 4%. In addition, the two beams can also be combined into one after about 50 iterations.
{"title":"Dynamic multiple beam forming based on the fiber laser phased array","authors":"Guan Huang, Guoyun Lv, Yangyu Fan","doi":"10.1117/12.2601327","DOIUrl":"https://doi.org/10.1117/12.2601327","url":null,"abstract":"Multiple beam generation and adaptive control plays an important role in the laser propagation applications. The existing approaches are usually mechanical, so they have many limitations in terms of accuracy, bandwidth, and flexibility. In this paper, a kind of dynamic multiple beam forming method based on the fiber laser phased array (FLPA) is proposed. In this method, the FLPA based on the multi-objective optimization algorithm is employed, which can theoretically generate any number of outgoing beams, and dynamically adjust the power of each beam. The numerical simulation experiments based on a 19-cell FLPA were conducted. The results show that two stable outgoing beams of FLPA can be generated after about 200 iterations, and the power distribution error of the two beams can reach less than 4%. In addition, the two beams can also be combined into one after about 50 iterations.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"25 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":"129218109","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}
Chenxu Wang, H. Bian, Zhanda Zhu, Yongling Hui, H. Lei, Qiang Li
It’s an effective method to produce mid infrared laser that CO2 laser frequency doubling by using quasi-phase-matched (QPM) crystal. The main problem in the preparing diffusion bonding crystal is controlling the defects. In this paper, the bonding temperature, pressure, time and other parameters are optimized to reduce the interface loss. When the bonding temperature is 700°C , the bonding pressure of 0.27kg/mm2, a 49 layer QPM GaAs crystal was fabricated, and the interface loss of the single layer was less than 0.13%. Using the prepared QPM-GaAs crystal for second harmonic generation, 23% SHG efficiency was achieved in a CO2 laser with 10.56μm wavelength, 219 mJ pulse energy and 110 ns pulse width.
{"title":"Optimization of diffusion bonding process for QPM GaAs crystals","authors":"Chenxu Wang, H. Bian, Zhanda Zhu, Yongling Hui, H. Lei, Qiang Li","doi":"10.1117/12.2602985","DOIUrl":"https://doi.org/10.1117/12.2602985","url":null,"abstract":"It’s an effective method to produce mid infrared laser that CO2 laser frequency doubling by using quasi-phase-matched (QPM) crystal. The main problem in the preparing diffusion bonding crystal is controlling the defects. In this paper, the bonding temperature, pressure, time and other parameters are optimized to reduce the interface loss. When the bonding temperature is 700°C , the bonding pressure of 0.27kg/mm2, a 49 layer QPM GaAs crystal was fabricated, and the interface loss of the single layer was less than 0.13%. Using the prepared QPM-GaAs crystal for second harmonic generation, 23% SHG efficiency was achieved in a CO2 laser with 10.56μm wavelength, 219 mJ pulse energy and 110 ns pulse width.","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":"115748865","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}
Background interference of impurity in strong water is the key factor restricting the detection distance and target characteristics of the weak target. Aiming at the problems of less echo characteristics and difficult identification of the characteristics of the underwater weak target laser detection, the paper studies the problem of the broadening of the laser echo pulse of the weak target under the background of strong water interference. A system of underwater weak target laser measurement and analysis is designed to suppress the near-field water scattering interference. The system can achieve matching adjustment among laser emission energy, laser beam angle and laser APD receiving gain. The detection performance of different underwater weak targets (small-scale metal, black rubber, low reflectivity reef, water grass, transparent plastic) was tested under different laser emission energy, different detection distance and different laser echo receiving gain. Through statistical analysis of data, the pulse width and material of the target of different underwater weak targets were obtained The relationship between the power of pulse laser, the distance between laser emission and target. The results show that the pulse broadening characteristics of the laser echo signal can be used to identify the weak target laser detection characteristics under the background of strong water impurity interference.
{"title":"Study on the characteristics of underwater target laser echo based on pulse broadening","authors":"Yujia Wang, S. Zong, Xin Zhang","doi":"10.1117/12.2603111","DOIUrl":"https://doi.org/10.1117/12.2603111","url":null,"abstract":"Background interference of impurity in strong water is the key factor restricting the detection distance and target characteristics of the weak target. Aiming at the problems of less echo characteristics and difficult identification of the characteristics of the underwater weak target laser detection, the paper studies the problem of the broadening of the laser echo pulse of the weak target under the background of strong water interference. A system of underwater weak target laser measurement and analysis is designed to suppress the near-field water scattering interference. The system can achieve matching adjustment among laser emission energy, laser beam angle and laser APD receiving gain. The detection performance of different underwater weak targets (small-scale metal, black rubber, low reflectivity reef, water grass, transparent plastic) was tested under different laser emission energy, different detection distance and different laser echo receiving gain. Through statistical analysis of data, the pulse width and material of the target of different underwater weak targets were obtained The relationship between the power of pulse laser, the distance between laser emission and target. The results show that the pulse broadening characteristics of the laser echo signal can be used to identify the weak target laser detection characteristics under the background of strong water impurity interference.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"278 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-31","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120879203","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 nonlinear Thomson backscattering process of electron under circularly polarized laser pulses is studied. The influence of the central collision position of the electron and laser pulses on the spectral characteristics of the scattered light is analyzed. The results show that the frequency broadening caused by doppler nonlinear frequency shift can be reduced and the monochromicity of the emitted light can be improved by adjusting the central collision position or the initial position of electron appropriately. At the same time, taking the requirements for the radiation intensity of scattered light into account, the optimal situation to generate quasi-monochromatic x-rays is presented. Besides, a scheme to increase the radiation energy of backscattered light by controlling the laser pulse width is proposed without changing the frequency band width. It provides a solution to overcome the problem that the radiation energy is too weak in the scheme of changing the initial position of electron. In addition, it was found that the interference fringes of the emitted light growing greatly as the pulse width increases.
{"title":"Generation of a quasi-monochromatic x-ray via collision of electron with tightly focused laser pulses","authors":"J. Zhuang, Yiqiu Wang, Conglin Wang, Youwei Tian","doi":"10.1117/12.2600762","DOIUrl":"https://doi.org/10.1117/12.2600762","url":null,"abstract":"The nonlinear Thomson backscattering process of electron under circularly polarized laser pulses is studied. The influence of the central collision position of the electron and laser pulses on the spectral characteristics of the scattered light is analyzed. The results show that the frequency broadening caused by doppler nonlinear frequency shift can be reduced and the monochromicity of the emitted light can be improved by adjusting the central collision position or the initial position of electron appropriately. At the same time, taking the requirements for the radiation intensity of scattered light into account, the optimal situation to generate quasi-monochromatic x-rays is presented. Besides, a scheme to increase the radiation energy of backscattered light by controlling the laser pulse width is proposed without changing the frequency band width. It provides a solution to overcome the problem that the radiation energy is too weak in the scheme of changing the initial position of electron. In addition, it was found that the interference fringes of the emitted light growing greatly as the pulse width increases.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"12367 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":"116178869","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}
Small angle light scattering measurement is more relevant for determining the size of solid aerosols, but small scattering angle measurement results will be interfered by larger stray light. The key technology is to suppress the background noise caused by the Fraunhofer diffraction of the laser light source and the Rayleigh scattering of atmospheric molecules, so as to improve the resolution of weak scattered light signal of strong light absorption small particle aerosol. An adaptive filtering method of forward small angle aerosol scattering signal is proposed based on recursive least-square (RLS) algorithm. By analyzing the characteristics of small-angle aerosol detection signals, the forgetting factor in traditional RLS is optimized, so that it can not only distinguish aerosol scattered light signals from stray light signals, but also dynamically adjust according to the amplitude change under different particle size and absorbance. In order to verify the filtering effect, small angle scattering light pulse extraction experiments of aerosols with different absorbance and different particle sizes were conducted in a simulated smoke box. Experiments show that the proposed variable forgetting factor RLS algorithm can effectively suppress stray light signals caused by laser light sources and atmospheric molecules. When the aerosol detection signal appears, the algorithm has fast convergence speed and tracking speed, which highlights the aerosol pulse signal well. Compared with the traditional method, the resolution of the processed aerosol scattering pulse signal increases dramatically and has a great advantage in the extraction of weak scattering pulse signal.
{"title":"Extraction of forward small angle particle scattering light pulse signal based on variable forgetting factor RLS algorithm","authors":"Rongrui Zhang, Heng Zhao","doi":"10.1117/12.2603148","DOIUrl":"https://doi.org/10.1117/12.2603148","url":null,"abstract":"Small angle light scattering measurement is more relevant for determining the size of solid aerosols, but small scattering angle measurement results will be interfered by larger stray light. The key technology is to suppress the background noise caused by the Fraunhofer diffraction of the laser light source and the Rayleigh scattering of atmospheric molecules, so as to improve the resolution of weak scattered light signal of strong light absorption small particle aerosol. An adaptive filtering method of forward small angle aerosol scattering signal is proposed based on recursive least-square (RLS) algorithm. By analyzing the characteristics of small-angle aerosol detection signals, the forgetting factor in traditional RLS is optimized, so that it can not only distinguish aerosol scattered light signals from stray light signals, but also dynamically adjust according to the amplitude change under different particle size and absorbance. In order to verify the filtering effect, small angle scattering light pulse extraction experiments of aerosols with different absorbance and different particle sizes were conducted in a simulated smoke box. Experiments show that the proposed variable forgetting factor RLS algorithm can effectively suppress stray light signals caused by laser light sources and atmospheric molecules. When the aerosol detection signal appears, the algorithm has fast convergence speed and tracking speed, which highlights the aerosol pulse signal well. Compared with the traditional method, the resolution of the processed aerosol scattering pulse signal increases dramatically and has a great advantage in the extraction of weak scattering pulse signal.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"8 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":"124982725","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}
Li Wang, B. Dong, Jin Yang, Shikun He, Yunli Bai, Gang Wang
5μm thickness silicon coatings were deposited on RB-SiC、S-SiC、Si and Bk7 substrates using ion-assisted e-beam evaporation method, respectively. Renishaw inVia confocal laser Raman spectrometer was used to study the microstructure of all the samples. The measurement results show that the substrate’s thermal expansion coefficient has great influence on the microstructure of nano-silicon coatings. Owing to 300 degree deposition temperature, there will be thermal stress when the samples are cooled down, which leading to medium-range and short-range order of silicon molecular structure change. Accordingly, TA and TO2 mode will appear or disappear in Raman scattering spectra. Amorphous silicon coating can crystalize after laser irradiation with different Raman scattering TO peak offset for different substrates. Especially for nanosilicon coatings grown on reaction bonded SiC (RB-SiC) and Sintered SiC (S-SiC) under the same deposition conditions, they have different Raman scattering spectra and their thermal stress is different, which will give guidance to deposition and polishing process of nano-silicon layers.
{"title":"Raman analysis of the microstructures of nano-silicon coatings grown on different substrates","authors":"Li Wang, B. Dong, Jin Yang, Shikun He, Yunli Bai, Gang Wang","doi":"10.1117/12.2602897","DOIUrl":"https://doi.org/10.1117/12.2602897","url":null,"abstract":"5μm thickness silicon coatings were deposited on RB-SiC、S-SiC、Si and Bk7 substrates using ion-assisted e-beam evaporation method, respectively. Renishaw inVia confocal laser Raman spectrometer was used to study the microstructure of all the samples. The measurement results show that the substrate’s thermal expansion coefficient has great influence on the microstructure of nano-silicon coatings. Owing to 300 degree deposition temperature, there will be thermal stress when the samples are cooled down, which leading to medium-range and short-range order of silicon molecular structure change. Accordingly, TA and TO2 mode will appear or disappear in Raman scattering spectra. Amorphous silicon coating can crystalize after laser irradiation with different Raman scattering TO peak offset for different substrates. Especially for nanosilicon coatings grown on reaction bonded SiC (RB-SiC) and Sintered SiC (S-SiC) under the same deposition conditions, they have different Raman scattering spectra and their thermal stress is different, which will give guidance to deposition and polishing process of nano-silicon layers.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"41 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":"125099616","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}
Xinyi Li, Zexin Zhang, P. Duan, J. Tian, Yanrong Song
Dark soliton is a promising tool in communication systems for its ability to preserve its good shape. This paper demonstrates the generation of dark soliton in an Yb-doped fiber laser with a compact figure-9 resonator based on the principle of nonlinear amplifying loop mirror. In this laser, when the polarization controller is located in the gain fiber or single-mode fiber, the generation of dark soliton, bright soliton and bright-dark soliton pair, as well as the transformation between them, can be realized. This experiment provides the evidence on the generation of dark soliton at 1 μm, and the results show that the figure-9 fiber laser may obtain dark soliton, bright soliton or bright-dark soliton pair by simply adjusting the PC, which is helpful to obtain dark-soliton pulses in fiber lasers.
{"title":"Experimental investigation on dark solitons formation in Figure-9 Yb doped fiber laser","authors":"Xinyi Li, Zexin Zhang, P. Duan, J. Tian, Yanrong Song","doi":"10.1117/12.2603121","DOIUrl":"https://doi.org/10.1117/12.2603121","url":null,"abstract":"Dark soliton is a promising tool in communication systems for its ability to preserve its good shape. This paper demonstrates the generation of dark soliton in an Yb-doped fiber laser with a compact figure-9 resonator based on the principle of nonlinear amplifying loop mirror. In this laser, when the polarization controller is located in the gain fiber or single-mode fiber, the generation of dark soliton, bright soliton and bright-dark soliton pair, as well as the transformation between them, can be realized. This experiment provides the evidence on the generation of dark soliton at 1 μm, and the results show that the figure-9 fiber laser may obtain dark soliton, bright soliton or bright-dark soliton pair by simply adjusting the PC, which is helpful to obtain dark-soliton pulses in fiber lasers.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"7 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":"125319880","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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