【摘要】：受激布里淵散射是光學(xué)材料的一種重要破壞機(jī)制。研究受激布里淵散射對(duì)光學(xué)材料破壞過(guò)程的影響,對(duì)于ICF物理實(shí)驗(yàn)和高能固體激光驅(qū)動(dòng)器兩方面的發(fā)展,都具有重要的意義。本文基于非線性耦合波理論,通過(guò)FORTRAN語(yǔ)言編程數(shù)值模擬了熔石英內(nèi)部受激布里淵散射效應(yīng)的發(fā)展過(guò)程及其對(duì)熔石英損傷過(guò)程的影響。通過(guò)研究材料內(nèi)受激布里淵散射過(guò)程中產(chǎn)生應(yīng)力的分布,分析了其破壞過(guò)程及形貌。并進(jìn)一步討論了矩形脈沖作用下泵浦光參數(shù)(光強(qiáng)、波長(zhǎng))、種子光強(qiáng)和材料參數(shù)(長(zhǎng)度)等對(duì)受激布里淵散射過(guò)程的影響。并對(duì)高斯脈沖和聚焦高斯脈沖作用下受激布里淵散射過(guò)程的發(fā)展進(jìn)行了初步的探索。研究結(jié)果表明,材料內(nèi)由受激布里淵散射過(guò)程產(chǎn)生的應(yīng)力最大可以達(dá)到150 MPa,遠(yuǎn)超出熔石英的抗拉強(qiáng)度50 MPa,對(duì)熔石英的破壞過(guò)程具有極大的影響。從實(shí)驗(yàn)上通過(guò)對(duì)不同參數(shù)和規(guī)格樣品進(jìn)行損傷性能測(cè)試,研究了樣品厚度及樣品反射率(種子光強(qiáng))對(duì)光學(xué)元件破壞閾值的影響,實(shí)驗(yàn)結(jié)果與數(shù)值模擬結(jié)果有較好的一致性,間接的驗(yàn)證了數(shù)值模擬結(jié)果的正確性。結(jié)果表明:樣品厚度從30 mm減小到1 mm過(guò)程中,樣品的損傷閾值呈現(xiàn)提高趨勢(shì),從16 J/cm2提高到25 J/cm2,提升55%;鍍?cè)鐾改ず髽悠返募す庳?fù)載能力相較于原始樣品有所提高,更能承受住高能激光的輻照。相較于原始樣品100%概率損傷對(duì)應(yīng)的能量密度17 J/cm2,鍍膜后樣品的100%概率損傷對(duì)應(yīng)的能量密度為20J/cm2,后表面處承受能量密度更是由16.20 J/cm2提高到20.19J/cm2,提高了約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.
【學(xué)位授予單位】：西南科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TQ171.731

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本文編號(hào)：2391505