Sheng Wang, Jingfeng Ye, Lijun Wang, W. Liu, Jun Shao, Taotao Wu, Guohua Li
{"title":"Study on thermosensitive phosphor temperature measurement technology for surface temperature measurement of high power laser irradiated materials","authors":"Sheng Wang, Jingfeng Ye, Lijun Wang, W. Liu, Jun Shao, Taotao Wu, Guohua Li","doi":"10.1117/12.2639579","DOIUrl":"https://doi.org/10.1117/12.2639579","url":null,"abstract":"In view of the surface temperature distribution and temperature rise measurement demand of metal target irradiated by high power laser, the thermosensitive phosphor surface temperature measurement technology was studied. The principle of two-color temperature measurement was introduced. After solving the key technologies of optical system optimization design, temperature distribution inversion calculation and high precision calibration, a compact thermosensitive phosphor surface temperature measuring system was developed. The temperature measurement range from room temperature to 1500 K, the space measurement range was greater than that of diameter 50mm, and the spatial resolution was better than 0.5mm. The thermosensitive phosphor surface temperature measurement technique was used to measure the surface temperature distribution and temperature rise of stainless steel targets irradiated by high power laser, and the results were compared with the results of thermocouple and numerical simulation. It is proved that the surface temperature measurement system can realize the measurement of surface temperature field distribution of high power laser irradiated target, and has high temperature measurement precision.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"109 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127665470","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":"A low jitter 100J Xecl excimer laser","authors":"Chao Huang, Ai-ping Yi, Hao Wang, Wenbo Yan, Gaopeng Li, Zhengge Chen","doi":"10.1117/12.2656465","DOIUrl":"https://doi.org/10.1117/12.2656465","url":null,"abstract":"To obtain low jitter and high energy ultraviolet laser pulse, the XeCl excimer laser pumped by electron-beam was reported. The construction and the principle of the XeCl excimer laser with electron-beam pump source were described. Experimental study on laser output characteristic of the XeCl excimer laser was carried out, and effects on pressure of mix gas in laser chamber and charge voltage on jitter of laser pulse were showed. When the charge voltage of the laser is 81kV, the output energy of XeCl excimer laser was about 100J, its electric efficiency was about 0.58%, and the laser pulse jitter was less than 20ns.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"16 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124598413","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":"Generation of uranium aerosol with laser ablation to simulate nuclear facilities emission","authors":"Hongyu He, Zhixing Gao, Yun He, Qiushi Liu, Xiaohua Zhang, B. Guo","doi":"10.1117/12.2656213","DOIUrl":"https://doi.org/10.1117/12.2656213","url":null,"abstract":"Nuclear aerosol simulant generated in laboratory plays a unique role for the development of in-situ monitoring technology of nuclear facility emission. To simulate the emission of the trace uranium aerosol, an aerosol generator based on laser ablation was set up and tested experimentally. It is shown that the concentration of aerosol particles has a linear relationship in the range of 36.28 μg/m3 to 277.13 μg/m3 while the laser intensity keeps above 7.6×106 W/cm2 . The aerosol particle size distribution is stable, while the most particles are inhalable particles based on the measurement of an aerosol spectrometer. The composition is verified with a laser induced plasma spectroscopy. Several spectral lines of uranium have been clearly identified. It is demonstrated that aerosols generated based on laser ablation can simulate nuclear facilities emission effectively. The method will be used in further work to develop direct radioactive aerosol monitoring technology.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"81 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124989348","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":"Theoretical investigation of vector modes in a conventional photonic lantern","authors":"Xuanfeng Zhou, Yanbin Wang, Wenjian Xiao, Xing Men, Hanbing Zhou","doi":"10.1117/12.2651538","DOIUrl":"https://doi.org/10.1117/12.2651538","url":null,"abstract":"Vector mode properties in a 3×1 conventional photonic lantern (CPL) are theoretically investigated. Analytical solutions of vector modes in fiber cores at the weak tapering region of a 3×1 CPL are derived based on coupled mode theory and linear combination method. While at the strong tapering region of a 3×1 CPL where core modes cut off, vector modes in cladding can be derived by ignoring the impact of original fiber cores. These analytical solutions are verified by numerical calculations by a fully vectorial finite element mode solver. Further investigation shows that although there is no linear polarization selection mechanism in the tapering region of a CPL, linear polarization (LP) modes are still suitable for CPLs only if fiber modes finally evolve into LP modes in the output fiber. This conclusion can be very useful for simplifying the mode analysis of CPLs.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133536085","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}
M. Shen, Zhuohang Zhang, Jianghua Zhang, Jie Yang, Xin Zheng
{"title":"Numerical investigation of nonlinear broadened OFC based on the CS-DSB modulation frequency shift recirculation loop","authors":"M. Shen, Zhuohang Zhang, Jianghua Zhang, Jie Yang, Xin Zheng","doi":"10.1117/12.2655748","DOIUrl":"https://doi.org/10.1117/12.2655748","url":null,"abstract":"Since the growing needs of broadband optical frequency combs (OFCs) in many applications, in this paper, a carrier suppressed dual-sideband modulation recirculating frequency shift loop (RFSL) with an additional piece of highly nonlinear fiber (HNLF) is numerically investigated. The numerical results indicate that, thanking to the RFSL scheme, the frequency spacing of OFC can be both widely and precisely tuned over the range of 0.5 - 40 GHz. Moreover, the comb lines generated from RFSL can be then efficiently increased, using four wave mixing effect of HNLF in the simulation, thus the spectrum is further broadened. This work contributes to an effective and compact RFSL scheme for a frequency tunable OFC generation with broadband spectrum.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128098239","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}
Jifei Cai, Ze-lang Zhang, Hao Yu, Yunpeng Wang, Hongtao Mao
{"title":"Research on plasma characteristics of fused silica induced by millisecond pulsed laser","authors":"Jifei Cai, Ze-lang Zhang, Hao Yu, Yunpeng Wang, Hongtao Mao","doi":"10.1117/12.2656288","DOIUrl":"https://doi.org/10.1117/12.2656288","url":null,"abstract":"With the continuous development of optoelectronics science, the widespread and intensive application of transparent optical elements has become an indispensable condition for the development of information technology in society. Transparent optical elements under the action of strong laser light are prone to produce plasma and even then cause damage to the elements. Therefore, it is important to study the process of interaction between transparent optical elements and strong laser light and its results. In this paper, a theoretical research and simulation study is conducted to investigate the characteristics of 1064 nm millisecond pulsed laser induced plasma generation in transparent optical elements represented by fused silica. It is demonstrated that the plasma propagation velocity and the temperature of each part increase with the increase of laser energy density during the interaction between the millisecond pulsed laser and the transparent optical elements; the plasma propagation velocity tends to increase and then decrease with the increasing of laser action time, and the temperature continues to increase near the threshold value;The plasma propagation velocity increases with the increasing of laser pulse width, and the velocity variation pattern is similar in all pulse widths; the temperature increases with the increasing of laser pulse width and approaches the temperature threshold that can be reached by the combustion wave generated by the interaction between the millisecond pulsed laser and fused silica. Finally, the kinetic characteristics and temperature rise phenomenon of the plasma propagation generated during the interaction between the millisecond pulsed laser and the transparent optical element are explained.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128177249","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":"Measurements of x-ray spectra and absolute energies of laser produced Al plasmas","authors":"Yanpeng Liu, Quan-xi Xue, Xue-qing Zhao, Chao Huang, Hao Wang, Zhenjie Wu, Ai-ping Yi, K. Huang","doi":"10.1117/12.2655993","DOIUrl":"https://doi.org/10.1117/12.2655993","url":null,"abstract":"The X-ray properties of Al plasmas were studied experimentally by using the excimer laser facility in the State Key Laboratory of Laser Interaction with Matte. Radiated fluxes were recorded within two X-ray diodes, and the relative spectral distributions were recorded within an X-ray flat-field grating spectrograph, respectively. Experimental results indicated that the major X-ray photons were between 60 eV and 360 eV. By employing the spectral integration method, the measured data were appropriately processed to obtain absolute energies of the X-ray that radiated from Al plasmas.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129198052","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}
Yunfeng Zhang, Junfeng Shao, Chunrui Wang, Fei Chen, Jin Guo, Hua-chao Kang
{"title":"Application of boundary element method with convolution core in solving carrier evolution equation","authors":"Yunfeng Zhang, Junfeng Shao, Chunrui Wang, Fei Chen, Jin Guo, Hua-chao Kang","doi":"10.1117/12.2636394","DOIUrl":"https://doi.org/10.1117/12.2636394","url":null,"abstract":"Carrier evolution equation (continuity equation) of semi-conductor plays an essential role in simulation of laser interference and electrical damage induced by laser irradiation on charge coupled device (CCD). Solving the Poisson equation, which is coupled with the carrier evolution equation, is a necessary step to obtain the stable electronic field caused by doped atoms and the dynamic one caused by free carriers. In terms of carrier evolution simulation in high resolution-CCD, it is important to solve the Poisson equation promptly and efficiently. For this purpose, we adopt a boundary element method with convolution core combined with Gauss integral algorithm. In this method, we propose the pixel element model in which fast Fourier transform (FFT) is introduced so that the amount of calculation is greatly decreased compared with the finite difference method. In this approach, it is possible to simulate carrier evolution in high-resolution-CCD even on a common personal computer.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"19 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125208394","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":"Application of laser induced plasma spectroscopy for air pollution monitoring","authors":"Zhixing Gao, Hongyu He, Fengming Hu, Jing Li, Zhao Wang, Jianmin Gao","doi":"10.1117/12.2651485","DOIUrl":"https://doi.org/10.1117/12.2651485","url":null,"abstract":"Laser induced plasma spectroscopy (LIPS, also LIBS) is a promising technique for the challenging issues associated with the real-time and in-situ monitoring the major elements of aerosol particulate matters. A prototype of Aero-LIPS had been set up with the techniques of aerosol beam focusing, enhanced plasma emission collector and conditional data filter to demonstrate the potential application of air pollution composition monitoring. The prototype can identify more than 40 elements from aerosols and continuously monitor 20 elements with the time resolution of 10 minutes. In the field test of an Asian dust event, the major elements, such as Ca, Mg, Al, Si, Cl, P, S, etc. have been real-time monitored, which took 77.9% part of the total particulate matter mass. The evolutions of temporal elemental concentrations went well along with the particle matter concentration. It is interesting that several persist lines of U and Th have been detected from Asian dust aerosol while their concentration in local air should range in the level of nano-grams per cubic-meter. It might indicate that the enhanced-LIPS has a potential to monitor the nuclear facility emission for Nuclear Security and Safeguards.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122497840","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}
Haichuan Zhao, M. Tao, Hongwen Chen, Zhenbao Wang, Yong Wu, Junjie Wu, Lei Zhang, Ping Wang, Gang Feng, P. Yang
{"title":"Stimulated Brillouin scattering suppression in fiber amplifiers with multi-point pump","authors":"Haichuan Zhao, M. Tao, Hongwen Chen, Zhenbao Wang, Yong Wu, Junjie Wu, Lei Zhang, Ping Wang, Gang Feng, P. Yang","doi":"10.1117/12.2656860","DOIUrl":"https://doi.org/10.1117/12.2656860","url":null,"abstract":"A new scheme for Stimulated Brillouin Scattering (SBS) suppression is proposed based on multi-point pump technique. The pump power is coupled into the double-clad fiber by several pump points instead of one fiber combiner, which will rearrange the pump power distribution along the active fiber and influence the amplifier process of SBS light. The numerical simulation indicates that SBS is effectively suppressed in a fiber amplifier with an output up to 700W and a 1kHz line-width by virtue of the configuration. Besides, the SBS threshold demonstrates a 3.7 times increase compared with an strain allied scheme.","PeriodicalId":217394,"journal":{"name":"International Symposium on Laser Interaction with Matter","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121536697","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}