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为了提高高功率激光光束质量和改善近场均匀性,在SILEX-Ⅰ超短脉冲激光装置的泵浦光系统上进行实验,研究了一种双光子吸收材料的光限幅特性及对激光近场的改善情况。利用泵浦光SAGA激光器输出的激光进行光限幅特性实验。结果表明:该材料具有明显的光功率限幅特性,且透过率较高,当入射光强小于0.60 GW/cm2时,透过率大于90%。在SILEX-Ⅰ装置的泵浦光系统进行联机实验,研究了该材料对激光近场均匀性的改善。实验结果表明:经过材料后,激光近场均匀性和调制度有明显改善。
In order to improve the quality of high-power laser beam and improve the near-field uniformity, experiments were carried out on the pump light system of SILEX-Ⅰ ultrashort pulse laser device. The optical limiting properties of a two-photon absorption material and the effect of laser near field Improve the situation. The optical limiting characteristic experiment was carried out by the laser output from the pump SAGA laser. The results show that the material has obvious optical power limiting characteristics and high transmittance. When the incident light intensity is less than 0.60 GW / cm2, the transmittance is more than 90%. The on-line experiment was carried out on the pump light system of SILEX-Ⅰ device, and the improvement of the uniformity of laser near-field was studied. The experimental results show that: after the material, the laser near-field uniformity and modulation have significantly improved.