KDP晶体微纳加工表层杂质对其激光损伤阈值影响的有限元分析
Finite element analysis on influence of micro-nano machined surface impurity on optical performance of crystal
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摘要: 根据KDP晶体杂质附近的温度场及热应力场理论，分析了微纳加工表层杂质影响下晶体温度场及热应力场的分布情况，发现杂质离子对激光的强吸收作用是造成KDP晶体损伤的主要原因之一，也是影响KDP晶体激光损伤阈值的最主要因素。通过分析还发现杂质半径对晶体的激光损伤阈值也有影响，并得到一个有害的杂质半径，使得杂质吸收能量最多，温度最高。另外杂质种类及杂质含量的不同也会对晶体的激光损伤阈值产生影响。Abstract: Based on theory of temperature field and thermal stress field around inclusions in KDP crystals, the distribution of crystal temperature field and thermal stress field is analyzed under the influence of micro-nano machined superficial layer’s inclusions. It is found that ions of inclusions absorbing mucl injected laser lead to crystal damages. Inclusions’ sfrong absorbing of laser influenc KDP crystals laser damage threshold. The radius of adverse inclusion is obtained, with which the also inclusion absorbs the maximumenergy and reaches the wighest temperature. In addition, different kinds and different contents of inclusions have different effect on the crystal laser damage threshold．
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Key words:
- laser damage threshold /
- micro-nano surface impurity /
- finite element /
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