双变形镜对Yb:YAG板条激光器光束质量校正技术

Correction of beam quality correction of Yb:YAG laser with double deformable mirrors

    摘要
  • 摘要: 分析了Yb:YAG板条激光器波前畸变的基本特征，结合光斑形态和功率密度，提出了采用水冷式13单元一维变形镜和95单元二维变形镜相结合的双变形镜组合模式对Yb:YAG板条激光器的波前畸变进行闭环校正。针对输出激光的特征进行了校正需求分析和校正能力分析，以此为基础开展了一维变形镜和二维变形镜的仿真及优化设计，同步开展了哈特曼和高压驱动系统等硬件的研制。研制出的变形镜经受了满功率出光考核，验证了内循环冷却装置对水冷式变形镜的冷却效果，随后在闭环校正实验中，将激光器的开环光束质量β=9.03提升至闭环的1.98，验证了双变形镜组合模式的自适应光学系统对Yb:YAG板条激光器光束质量校正的能力。

     

    Abstract: The basic characteristics of the wavefront aberration of Yb:YAG slab laser were analysed. Combined with spot shape and power density, a double deformabe mirror combined of water cooled 1D DM of 13 units and 2D DM of 95 units was proposed to correct the wavefront aberration of Yb:YAG slab laser. According to the characteristics of the output laser, the calibration demand analysis and calibration capability analysis were carried out. Based on this, the simulation and optimization design of the 1D DM and 2D DM were improved. The beam quality of the laser was improved from 9.03 to 1.98 in the correction experiment. The beam quality correction ability of the adaptive optical system with double DM combination mode for Yb:YAG slab laser was verified.

     

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