真空阻挡透镜中应力诱导双折射的模拟

O. Lubin, O. Heuzé
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引用次数: 7

摘要

高能激光系统空间滤光透镜中真空载荷引起的应力诱导双折射是导致激光光束退偏的主要原因,会显著降低激光系统的频率转换效率。为了预测这些效应,我们进行了机械光学耦合计算。首先,我们用实验结果验证了我们的预测。然后,参数化研究使我们能够解释透镜几何特性的影响。我们的主要结果是对称透镜导致最小的双折射。
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MODELLING OF STRESS-INDUCED BIREFRINGENCE IN VACUUM BARRIER LENSES
Stress-induced birefringence arising from vacuum loading in the spatial filter lenses of high-energy laser systems is responsible for laser beam depolarization which may decrease the frequency conversion efficiency significantly. In order to predict these effects, we have carried out coupled mechanical-optical calculations. At first, we validated our predictions with experimental results. Then a parametric study allowed us to explain the influence of the geometrical characteristics of the lenses. Our main result is that symmetric lenses lead to minimum birefringence.
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