| Citation: | FAN Jiao-yu, YAO Zhi-huan, YU Jing-hua, CHEN Yi, ZHANG Xin, ZHANG Yi-wen, HAN Ren-jie, HUANG Chen, ZHANG Feng, LI Chun-ling, SUN Jun-jie, CHEN Fei. Near-zero thermal diopter in thin-disk crystal via M-shaped pumping modulation[J]. Chinese Optics. doi: 10.37188/CO.2026-0065
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To address the high sensitivity of thermally induced diopter and the limited stable operating range of near-collimated propagation thin-disk multi-pass amplifiers under high-power and high-energy conditions, this work investigates the suppression of the thermal lensing effect based on pump light intensity distribution control. First, the relationship between thin-disk diopter variation and the pump light intensity distribution is analyzed based on experimental measurements of the thin-disk diopter. On this basis, an M-shaped pumping is proposed to replace the conventional super-Gaussian pumping. A theoretical model is established to comparatively analyze the thin-disk temperature distribution and diopter variation under both pumping techniques within a pump power density range of 0−8.13 kW/cm2. The simulation results show that when the super-Gaussian order of the central depression region of the M-shaped pump is 8, the diopter variation of the thin-disk is minimized, with values of
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