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氙灯抽运将导致钕玻璃内的不均匀温升,由此带来空间频率较低的热畸变,成为整个光路中最主要的畸变源。研究了400 mm口径4×2组合式片状放大器的动态热畸变问题。初步研究结果表明,在现有抽运结构下,抽运能量导致钕玻璃片表面最大温升约为0.85℃;由此引起钕玻璃片的“S”形变,最大形变大约为1.7×10-6m,最大应力约为65 kPa,整个动态波前畸变约为0.3λ,与美国劳伦斯.利弗莫尔国家实验室(LLNL)的实验值相符。在目前的抽运结构下,动态波前畸变满足设计要求。
Xenon lamp pumping will result in uneven temperature rise in the neodymium glass, resulting in lower spatial frequency thermal distortion, becoming the most important source of distortion throughout the optical path. The dynamic thermal distortion of a 4 × 2 combo chip amplifier with 400 mm diameter was studied. The preliminary results show that under the existing pumping structure, the maximum temperature rise of the surface of neodymium glass sheet due to the pumping energy is about 0.85 ℃. As a result, the “S” deformation of the neodymium glass sheet is caused and the maximum deformation is about 1.7 × 10 -6m, the maximum stress is about 65 kPa, the whole dynamic wavefront distortion is about 0.3λ, which is consistent with the experimental value of Lawrence Livermore National Laboratory (LLNL). In the current pumping structure, dynamic wavefront distortion to meet the design requirements.