高功率二极管泵浦激光模块的热致球差
Thermally induced spherical aberration in high power diode pumped laser module
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摘要: 为获得高功率高光束质量的激光器，对激光器中的热致球差进行了研究。介绍了高功率二极管泵浦Nd:YAG棒激光模块热致球差的测量和补偿方法。使用S-H波前探测器测量了激光模块的三阶球差，设计了补偿系统对激光模块的球差进行了补偿，并对补偿前后的各阶像差进行了分析。在主振功放(MOPA)系统中使用球差补偿系统，工作电流110 A时，光束质量平方因子从9.2提高到6.4。实验结果表明球差补偿系统能消除激光模块的的三阶球差，而且不会引起其它像差的增大，提高了激光器光束质量。Abstract: The method of spherical aberration measurement and compensation is introduced for the high power and high beam quality diode pumped Nd:YAG rod lasers. The S-H wavefront sensor is employed to measure the 3rd spherical aberration, and a compensator is designed to correct it. The overall aberrations with and without compensation are analyzed. The beam quality factor of a master-oscillator power-amplifier system is improved from 9.2 to 6.4 with spherical aberration compensation(SAC). The experiment results prove that the 3rd spherical aberration of laser rod can be eliminated by SAC without increasing other aberrations, thus improving the beam quality of lasers.
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