Low-stress mounting technology of large aperture mirror
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摘要: 高功率固体激光装置对大口径反射镜附加波前畸变和姿态稳定提出了苛刻的要求，在确保姿态稳定性的同时，要求低应力夹持使附加波前畸变峰谷值（PV值）＜λ/3, 波长λ＝633 nm。提出了一种正面三点支撑结合侧面八点限位的大口径反射镜夹持技术，对该夹持结构下引起的附加波前畸变进行了仿真和实验研究，并对反射镜姿态稳定性进行了不同工况下的实验模拟。结果表明，该夹持方式引入的附加波前畸变PV值约为23.6 nm，振动、晃动、翻转不同工况下反射镜指向变化PV值小于50 μrad，附加波前畸变和姿态稳定性均满足高功率激光装置的要求。Abstract: The high-power solid-state laser facility puts forward stringent requirements for the additional wavefront distortion and attitude stability of the large-aperture mirror. While ensuring attitude stability, the peak-to-valley (PV) value of additional wavefront distortion caused by low-stress mounting is required to be less than λ/3 (wavelength λ＝633 nm). In this paper, a mounting technology of large aperture mirror with three-point front support and eight point side fixing is proposed. The additional wavefront distortion caused by the mounting structure is simulated and experimentally studied. And the attitude stability of mirror under different working conditions is experimentally researched. The results show that the PV value of additional wavefront distortion introduced by this mounting method is about 23.6 nm, and the PV value of the mirror pointing under different conditions of vibration, shaking, and flipping is less than 50 μrad. The additional wavefront distortion and attitude stability meet the requirements of high-power lasers.
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