熔石英玻璃的SBS效应及界面结构对损伤过程影响研究
发布时间：2018-12-25 18:58
【摘要】：受激布里渊散射是光学材料的一种重要破坏机制。研究受激布里渊散射对光学材料破坏过程的影响,对于ICF物理实验和高能固体激光驱动器两方面的发展,都具有重要的意义。本文基于非线性耦合波理论,通过FORTRAN语言编程数值模拟了熔石英内部受激布里渊散射效应的发展过程及其对熔石英损伤过程的影响。通过研究材料内受激布里渊散射过程中产生应力的分布,分析了其破坏过程及形貌。并进一步讨论了矩形脉冲作用下泵浦光参数(光强、波长)、种子光强和材料参数(长度)等对受激布里渊散射过程的影响。并对高斯脉冲和聚焦高斯脉冲作用下受激布里渊散射过程的发展进行了初步的探索。研究结果表明,材料内由受激布里渊散射过程产生的应力最大可以达到150 MPa,远超出熔石英的抗拉强度50 MPa,对熔石英的破坏过程具有极大的影响。从实验上通过对不同参数和规格样品进行损伤性能测试,研究了样品厚度及样品反射率(种子光强)对光学元件破坏阈值的影响,实验结果与数值模拟结果有较好的一致性,间接的验证了数值模拟结果的正确性。结果表明:样品厚度从30 mm减小到1 mm过程中,样品的损伤阈值呈现提高趋势,从16 J/cm2提高到25 J/cm2,提升55%;镀增透膜后样品的激光负载能力相较于原始样品有所提高,更能承受住高能激光的辐照。相较于原始样品100%概率损伤对应的能量密度17 J/cm2,镀膜后样品的100%概率损伤对应的能量密度为20J/cm2,后表面处承受能量密度更是由16.20 J/cm2提高到20.19J/cm2,提高了约25%。
[Abstract]:Stimulated Brillouin scattering is an important destruction mechanism of optical materials. The study of the effect of stimulated Brillouin scattering on the destruction process of optical materials is of great significance for the development of ICF physical experiments and high-energy solid-state laser drivers. Based on the nonlinear coupled wave theory, the development process of stimulated Brillouin scattering in fused quartz and its influence on the damage process of fused quartz are numerically simulated by FORTRAN programming. The stress distribution in stimulated Brillouin scattering is studied and the failure process and morphology are analyzed. The effects of pump parameters (light intensity, wavelength), seed light intensity and material parameters (length) on stimulated Brillouin scattering are discussed. The development of stimulated Brillouin scattering process under the action of Gao Si pulse and focused Gao Si pulse is also discussed. The results show that the maximum stress generated by the stimulated Brillouin scattering process in the material can be up to 150 MPa, and the tensile strength of the fused quartz is far higher than the tensile strength of the fused quartz at 50 MPa, which has a great influence on the failure process of the fused quartz. The effects of sample thickness and sample reflectivity (seed light intensity) on the damage threshold of optical elements are studied experimentally by testing the damage performance of samples with different parameters and specifications. The experimental results are in good agreement with the numerical simulation results. The correctness of the numerical simulation results is indirectly verified. The results showed that when the sample thickness decreased from 30 mm to 1 mm, the damage threshold increased from 16 J/cm2 to 25 J / cm 2, and the damage threshold increased from 16 J/cm2 to 25 J / cm 2. Compared with the original sample, the laser loading capacity of the sample after antireflection coating is better than that of the original sample, and it is more capable of withstanding the irradiation of high energy laser. Compared with the original sample, the energy density corresponding to the 100% probabilistic damage of the original sample is 17 J / cm ~ 2, the energy density corresponding to the 100% probability damage of the coated sample is 20 J / cm ~ 2, and the energy density at the back surface is increased from 16.20 J/cm2 to 20.19 J / cm ~ (2). It has been raised by about 25.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.731
本文编号：2391505
[Abstract]:Stimulated Brillouin scattering is an important destruction mechanism of optical materials. The study of the effect of stimulated Brillouin scattering on the destruction process of optical materials is of great significance for the development of ICF physical experiments and high-energy solid-state laser drivers. Based on the nonlinear coupled wave theory, the development process of stimulated Brillouin scattering in fused quartz and its influence on the damage process of fused quartz are numerically simulated by FORTRAN programming. The stress distribution in stimulated Brillouin scattering is studied and the failure process and morphology are analyzed. The effects of pump parameters (light intensity, wavelength), seed light intensity and material parameters (length) on stimulated Brillouin scattering are discussed. The development of stimulated Brillouin scattering process under the action of Gao Si pulse and focused Gao Si pulse is also discussed. The results show that the maximum stress generated by the stimulated Brillouin scattering process in the material can be up to 150 MPa, and the tensile strength of the fused quartz is far higher than the tensile strength of the fused quartz at 50 MPa, which has a great influence on the failure process of the fused quartz. The effects of sample thickness and sample reflectivity (seed light intensity) on the damage threshold of optical elements are studied experimentally by testing the damage performance of samples with different parameters and specifications. The experimental results are in good agreement with the numerical simulation results. The correctness of the numerical simulation results is indirectly verified. The results showed that when the sample thickness decreased from 30 mm to 1 mm, the damage threshold increased from 16 J/cm2 to 25 J / cm 2, and the damage threshold increased from 16 J/cm2 to 25 J / cm 2. Compared with the original sample, the laser loading capacity of the sample after antireflection coating is better than that of the original sample, and it is more capable of withstanding the irradiation of high energy laser. Compared with the original sample, the energy density corresponding to the 100% probabilistic damage of the original sample is 17 J / cm ~ 2, the energy density corresponding to the 100% probability damage of the coated sample is 20 J / cm ~ 2, and the energy density at the back surface is increased from 16.20 J/cm2 to 20.19 J / cm ~ (2). It has been raised by about 25.
【学位授予单位】：西南科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TQ171.731
【参考文献】
相关期刊论文 前3条
1 于欣,鞠有伦,王月珠,王骐,陈德应,张世文,唐晓军,孙丽娜,杜涛;利用受激布里渊散射提高固体激光系统光束质量的实验研究[J];中国激光;2001年08期
2 汤秀章，，姚刚，王孝君;KrF激光在SF_6气体中受激布里渊散射的研究[J];强激光与粒子束;1995年02期
3 陈飞,孟绍贤;光学材料破坏机理[J];物理学进展;1998年02期
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