{"title":"Improve the performance of 2μm GaSb-based high-power lasers by reducing the thermal effect of series resistance","authors":"Yi-hang Chen, Yi Zhang, Chengao Yang, Jin-ming Shang, Tian-fang Wang, Haiteng Wang, Xu Yingqiang, Yu Zhang, Niu Zhichuan","doi":"10.1117/12.2603171","DOIUrl":"https://doi.org/10.1117/12.2603171","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"31 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":"128382801","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}
Zebrafish is a well-established in vivo model that exhibit high homology with the development of human innate immunity while well-established human disease model in vivo for various human diseases as well as the drug safetyevaluation process. However, few optical imaging methods could effectively visualize the structure of adult zebrafish due to their limited penetration depth. In this paper, in vivo high-resolution and long-term characterization of human bone disease models based on zebrafish were achieved with optical coherence tomography (OCT). The capability of three-dimensional OCT imaging was also played important role in visualization of zebrafish bone disease model. This paper presents the construction of bone degradation and regeneration model and OCT imaging in vivo based on zebrafish.
{"title":"In-vivo characterization of zebrafish bone degradation and regeneration models by optical coherence tomography","authors":"Weijian Gao, Mengyu Zhou, Jing Huang, Shuqi Gan, Yao Xu, Ting Lu, Yiqing Zhang, Jian Zhang","doi":"10.1117/12.2603248","DOIUrl":"https://doi.org/10.1117/12.2603248","url":null,"abstract":"Zebrafish is a well-established in vivo model that exhibit high homology with the development of human innate immunity while well-established human disease model in vivo for various human diseases as well as the drug safetyevaluation process. However, few optical imaging methods could effectively visualize the structure of adult zebrafish due to their limited penetration depth. In this paper, in vivo high-resolution and long-term characterization of human bone disease models based on zebrafish were achieved with optical coherence tomography (OCT). The capability of three-dimensional OCT imaging was also played important role in visualization of zebrafish bone disease model. This paper presents the construction of bone degradation and regeneration model and OCT imaging in vivo based on zebrafish.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"29 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":"121480156","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 level of fine particulate air pollution exposure is positively correlated with the death rate of individuals infected with COVID-19. Monitoring is the first step to prevent fine particulate pollution. The instrument based on light scattering method to detect particle concentration has unparalleled advantages over other instruments due to its rapidity, real-time and low cost. Traditional light scattering instruments are limited by the light absorption and particle properties of particles, and their ability to monitor some particles with strong light absorption is greatly reduced. Moreover, when the measured environment is greatly different from the calibration environment, the measurement results often have large errors. In this research, an instrument is designed to detect the forward scattering of light from small angles of particles. It can monitor the number concentration of particles in the environment in real time in four particle size ranges (PM1, PM2.5, PM4 and PM10) and convert it into the mass concentration of particles. By using the simulated atmospheric smoke box and the standard instrument to conduct a field comparison experiment, the reliability and stability of the measurement results are verified.
{"title":"Real-time detection of atmospheric fine particle mass concentration based on laser forward small angle scattering","authors":"Heng Zhao, Rongrui Zhang","doi":"10.1117/12.2603157","DOIUrl":"https://doi.org/10.1117/12.2603157","url":null,"abstract":"The level of fine particulate air pollution exposure is positively correlated with the death rate of individuals infected with COVID-19. Monitoring is the first step to prevent fine particulate pollution. The instrument based on light scattering method to detect particle concentration has unparalleled advantages over other instruments due to its rapidity, real-time and low cost. Traditional light scattering instruments are limited by the light absorption and particle properties of particles, and their ability to monitor some particles with strong light absorption is greatly reduced. Moreover, when the measured environment is greatly different from the calibration environment, the measurement results often have large errors. In this research, an instrument is designed to detect the forward scattering of light from small angles of particles. It can monitor the number concentration of particles in the environment in real time in four particle size ranges (PM1, PM2.5, PM4 and PM10) and convert it into the mass concentration of particles. By using the simulated atmospheric smoke box and the standard instrument to conduct a field comparison experiment, the reliability and stability of the measurement results are verified.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"70 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":"121707453","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":"Suppression RIN of CW fiber laser by nonlinear absorption effect","authors":"Weiqian Zhao, Chun Yang","doi":"10.1117/12.2601001","DOIUrl":"https://doi.org/10.1117/12.2601001","url":null,"abstract":"","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"3 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":"115058558","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}
L. He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan
In situ carbides (TiC/Cr7C3) reinforced CoCrMoNbTiC0.2 high-entropy alloy coatings were prepared on the Ti-6Al- 4V titanium alloy substrate by laser melting deposition technology. Effect of the laser power on the surface morphology, phase consistent, microstructure and microhardness were investigated. The results show that the coatings were composed of a simple BCC solid solution and a small amount of TiC and Cr7C3 carbides. The in-situ MC (TiC/Cr7C3) carbides were evenly distributed in the BCC matrix. The laser power has a significant impact on the forming quality and mechanical properties of the coatings. As the optimal laser power of 1500 W were applied, the coating mostly free of defects exhibited a fine dendritic microstructure. With the increasing laser power, the microhardness of the coatings was first increased and then decreased gradually. The highest microhardness of the coating (1500 W) was up to 650 HV0.5, which was 2 times higher than that of the substrate. The excellent mechanical properties of the coatings were attributed to the synergetic effects of the second phase strengthening, solid solution strengthening and fine microstructure.
{"title":"Microstructure and mechanical properties of in-situ MC-reinforced CoCrMoNbTi high-entropy alloy coating by laser additive manufacturing","authors":"L. He, Mina Zhang, Xuyang Ye, Zifa Xu, Wenwu Zhang, Dianbo Ruan","doi":"10.1117/12.2603053","DOIUrl":"https://doi.org/10.1117/12.2603053","url":null,"abstract":"In situ carbides (TiC/Cr7C3) reinforced CoCrMoNbTiC0.2 high-entropy alloy coatings were prepared on the Ti-6Al- 4V titanium alloy substrate by laser melting deposition technology. Effect of the laser power on the surface morphology, phase consistent, microstructure and microhardness were investigated. The results show that the coatings were composed of a simple BCC solid solution and a small amount of TiC and Cr7C3 carbides. The in-situ MC (TiC/Cr7C3) carbides were evenly distributed in the BCC matrix. The laser power has a significant impact on the forming quality and mechanical properties of the coatings. As the optimal laser power of 1500 W were applied, the coating mostly free of defects exhibited a fine dendritic microstructure. With the increasing laser power, the microhardness of the coatings was first increased and then decreased gradually. The highest microhardness of the coating (1500 W) was up to 650 HV0.5, which was 2 times higher than that of the substrate. The excellent mechanical properties of the coatings were attributed to the synergetic effects of the second phase strengthening, solid solution strengthening and fine microstructure.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"38 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":"124874524","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}
Guiying Ma, Xiaoxiao Chen, Yang Liu, Huihui Zhang, Wenwu Zhang
Due to excellent properties such as high hardness, high temperature resistance, corrosion resistance and low thermal conductivity, siliconnitrideceramicsare widely used in aerospace, moldand semiconductor fields. This paper studied the material removal characteristics of fixedpoint laser ablation and microgrooving of silicon nitride ceramics in the cross-coupling energy domain after laser beam splitting and combining. When using nanosecond laser for fixed point ablation, the effect of defocus on the surface characteristics of laser ablation was analyzed. When processing surface microgrooves in different directions, the influence of the directional effect of the spatial characteristics of the coupled energy domain on the processing quality was studied. By test and analysis of the surface morphology characteristics of silicon nitride ceramics, the results show thatthe change of the defocus affects the processing depthwhen a fixed point is ablatedin the cross-coupling energy domain. Thedirection effect of microgroove processing has a more significant effect on the surface characteristics.
{"title":"Directional effect and surface features of silicon nitride ceramics by laser spot ablation and microgrooving","authors":"Guiying Ma, Xiaoxiao Chen, Yang Liu, Huihui Zhang, Wenwu Zhang","doi":"10.1117/12.2603271","DOIUrl":"https://doi.org/10.1117/12.2603271","url":null,"abstract":"Due to excellent properties such as high hardness, high temperature resistance, corrosion resistance and low thermal conductivity, siliconnitrideceramicsare widely used in aerospace, moldand semiconductor fields. This paper studied the material removal characteristics of fixedpoint laser ablation and microgrooving of silicon nitride ceramics in the cross-coupling energy domain after laser beam splitting and combining. When using nanosecond laser for fixed point ablation, the effect of defocus on the surface characteristics of laser ablation was analyzed. When processing surface microgrooves in different directions, the influence of the directional effect of the spatial characteristics of the coupled energy domain on the processing quality was studied. By test and analysis of the surface morphology characteristics of silicon nitride ceramics, the results show thatthe change of the defocus affects the processing depthwhen a fixed point is ablatedin the cross-coupling energy domain. Thedirection effect of microgroove processing has a more significant effect on the surface characteristics.","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":"129653552","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}
Traditional terahertz time-domain spectroscopy (THZ-TDS) can provide a broadband spectral response of the measured object and has been widely used. Notwithstanding, for applications that require real-time quantitative detection such as security inspection, more attention should be paid to the terahertz response around the absorption characteristics of the sample. Terahertz frequency domain spectroscopy (THz-FDS) using frequency modulation continuous wave can better meet the real-time requirements of security applications. In this paper, an analytical method is established to achieve accurate prediction of molar concentration for organics. The absorption coefficient spectra of samples with different molar concentrations are obtained by using traditional THz-TDS in a wide frequency range, and then the THz-FDS based on photomixing technology is applied to locking a narrow band range near the absorption peak for rapid quantitative analysis. The scheme was verified by taking α-lactose monohydrate as an example, and the results showed that the mean square error of concentration prediction was only 0.025 under the interference of water vapor environment. It may shed light on terahertz rapid quantitative detection of organic compounds in realistic security scene.
{"title":"Quantitative analysis of organics based on terahertz frequency-domain spectroscopy","authors":"Xing-yue Li, Zhaohui Zhang, Xiaoyan Zhao, Tian-yao Zhang","doi":"10.1117/12.2603032","DOIUrl":"https://doi.org/10.1117/12.2603032","url":null,"abstract":"Traditional terahertz time-domain spectroscopy (THZ-TDS) can provide a broadband spectral response of the measured object and has been widely used. Notwithstanding, for applications that require real-time quantitative detection such as security inspection, more attention should be paid to the terahertz response around the absorption characteristics of the sample. Terahertz frequency domain spectroscopy (THz-FDS) using frequency modulation continuous wave can better meet the real-time requirements of security applications. In this paper, an analytical method is established to achieve accurate prediction of molar concentration for organics. The absorption coefficient spectra of samples with different molar concentrations are obtained by using traditional THz-TDS in a wide frequency range, and then the THz-FDS based on photomixing technology is applied to locking a narrow band range near the absorption peak for rapid quantitative analysis. The scheme was verified by taking α-lactose monohydrate as an example, and the results showed that the mean square error of concentration prediction was only 0.025 under the interference of water vapor environment. It may shed light on terahertz rapid quantitative detection of organic compounds in realistic security scene.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"84 6 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":"128777000","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}
Ge Ziyi, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan
Volume Bragg gratings based on PTR glass are widely applied in high-power laser systems because of its good Bragg selection, high diffraction efficiency and high laser damage threshold. In this work, the photo-thermo induced nucleation mechanism of PTR glass was studied by comparing the absorption spectra of PTR glass before and after UV irradiation and nucleation heat treatment with Gaussian decomposition method. The results show that: the Ag0 atom formed by UV irradiation tends to be saturated at the irradiation dose of 1J/cm2 ; under the same irradiation dose, the irradiation power has no obvious effect on the number of Ag0 atoms, but it will change the the number of free electrons in glass matrix; after UV irradiation and nucleated at 460°C for 2h, the photosensitivity of PTR glass will reappear and AgBr clusters will be dominant in the silver micelles.
{"title":"Effect of UV irradiation on photo-thermo induced nucleation of PTR glass","authors":"Ge Ziyi, Baoxing Xiong, Fan Gao, Xiang Zhang, Xiao Yuan","doi":"10.1117/12.2602971","DOIUrl":"https://doi.org/10.1117/12.2602971","url":null,"abstract":"Volume Bragg gratings based on PTR glass are widely applied in high-power laser systems because of its good Bragg selection, high diffraction efficiency and high laser damage threshold. In this work, the photo-thermo induced nucleation mechanism of PTR glass was studied by comparing the absorption spectra of PTR glass before and after UV irradiation and nucleation heat treatment with Gaussian decomposition method. The results show that: the Ag0 atom formed by UV irradiation tends to be saturated at the irradiation dose of 1J/cm2 ; under the same irradiation dose, the irradiation power has no obvious effect on the number of Ag0 atoms, but it will change the the number of free electrons in glass matrix; after UV irradiation and nucleated at 460°C for 2h, the photosensitivity of PTR glass will reappear and AgBr clusters will be dominant in the silver micelles.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"6 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":"130248475","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}
High precision on-orbit geometric calibration technology is the key to obtaining high precision satellite laser altimeters. Different from the traditional full-waveform laser altimeter, the single-photon laser altimeter has the characteristics of high repetition frequency and small footprint. These characteristics put forward new requirements for on-orbit geometric calibration. Aiming at the characteristics of the single-photon laser altimeter, this paper proposes a pointing angle and range calibration algorithm based on a Corner Cube Retro-Reflectors (CCRs). The algorithm determines the position of the CCR closest to the center of the footprint based on the photon signal returned by the CCR deployed on the ground, and unifies the natural ground and the laser footprint and establishes an on-orbit geometric calibration model. Through 8 sets of control experiments, the system errors of 30 second,60 second and 90 second are added to the pointing angle, and the system errors of -3m,-4m,-6m and -9m are added to the range. After using this algorithm for calibration, The average elevation deviation is decreased from more than 86m to less than 1m. The results show that the CCR-based pointing angle and range calibration algorithm can better restore the added system error, and can effectively improve the data accuracy of the laser altimeter.
{"title":"A satellite photon-counting laser altimeter calibration algorithm using CCRs and indirect adjustment","authors":"Yalei Guo, Huan Xie, Qi Xu, Xiaoshuai Liu, Xu Wang, Binbin Li, X. Tong","doi":"10.1117/12.2603099","DOIUrl":"https://doi.org/10.1117/12.2603099","url":null,"abstract":"High precision on-orbit geometric calibration technology is the key to obtaining high precision satellite laser altimeters. Different from the traditional full-waveform laser altimeter, the single-photon laser altimeter has the characteristics of high repetition frequency and small footprint. These characteristics put forward new requirements for on-orbit geometric calibration. Aiming at the characteristics of the single-photon laser altimeter, this paper proposes a pointing angle and range calibration algorithm based on a Corner Cube Retro-Reflectors (CCRs). The algorithm determines the position of the CCR closest to the center of the footprint based on the photon signal returned by the CCR deployed on the ground, and unifies the natural ground and the laser footprint and establishes an on-orbit geometric calibration model. Through 8 sets of control experiments, the system errors of 30 second,60 second and 90 second are added to the pointing angle, and the system errors of -3m,-4m,-6m and -9m are added to the range. After using this algorithm for calibration, The average elevation deviation is decreased from more than 86m to less than 1m. The results show that the CCR-based pointing angle and range calibration algorithm can better restore the added system error, and can effectively improve the data accuracy of the laser altimeter.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"64 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":"126383624","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}
We demonstrated a three-stage cascaded Raman soliton frequency shift structure in mid-infrared region (MIR) through numerical simulation. By cascading germania-core fiber, Er3+ ZBLAN fiber amplifier with an indium fluoride or (InF3) or TeO2-Bi2O3-ZnO-Na2O (TBZN) fiber, we achieved 2-4.75 μm and 2-5.5 μm tunable range respectively. When the same tunable range was achieved, both the energy and conversion efficiency of Raman solitons in the designed three stage cascaded structure were greatly improved, comparing with structure with single Raman shifter fiber. Our work could provide an effective way to improve the energy and conversion efficiency of Raman solitons in the commonly used single Raman frequency shift structure.
{"title":"Numerical demonstration of a multistage cascaded Raman soliton shift structure in mid-infrared region","authors":"Yiwei Hou, Qi Wu, Xiaodong Wu, Fei Liu, Hongyu Luo, Jianfeng Li","doi":"10.1117/12.2603006","DOIUrl":"https://doi.org/10.1117/12.2603006","url":null,"abstract":"We demonstrated a three-stage cascaded Raman soliton frequency shift structure in mid-infrared region (MIR) through numerical simulation. By cascading germania-core fiber, Er3+ ZBLAN fiber amplifier with an indium fluoride or (InF3) or TeO2-Bi2O3-ZnO-Na2O (TBZN) fiber, we achieved 2-4.75 μm and 2-5.5 μm tunable range respectively. When the same tunable range was achieved, both the energy and conversion efficiency of Raman solitons in the designed three stage cascaded structure were greatly improved, comparing with structure with single Raman shifter fiber. Our work could provide an effective way to improve the energy and conversion efficiency of Raman solitons in the commonly used single Raman frequency shift structure.","PeriodicalId":330466,"journal":{"name":"Sixteenth National Conference on Laser Technology and Optoelectronics","volume":"39 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":"127089511","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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