Method to improve beam quality by compensating spherical aberrations in master oscillator power amplifier laser systems.
Method to improve beam quality by compensating spherical aberrations in master oscillator power amplifier laser systems.
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DOI：
10.1364/ao.53.007963
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发表时间：
2014-11
期刊：
影响因子：
1.9
通讯作者：
Z. Ye;Yi Wang;Zhigang Zhao;Chong Liu;Z. Xiang
中科院分区：
文献类型：
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作者：
Z. Ye;Yi Wang;Zhigang Zhao;Chong Liu;Z. Xiang
提出了一种改善主振荡功率放大激光系统光束质量的方法。首次对激光谐振腔中光束波前的演化进行了深入的研究。当激光束在谐振腔内部传播时，光束波前的球面像差系数可以改变符号，即，负球差系数可以变为正，反之亦然。当光束在自由空间中的谐振腔外部传播时，也会发生该过程。在激光放大器中，强泵浦激光棒的正球差可以很好地补偿负球差振荡器输出的激光束。激光光束质量M2因子从2.2显著提高到1.4，而输出功率从31 W提高到60 W。
A method is presented for beam quality improvement, in master oscillator power amplifier laser systems. Intensive study was first carried out with the beam wavefront evolution in a laser resonator. When the laser beam propagates inside the resonator, the spherical aberration coefficient of the beam wavefront can change sign, i.e., the negative spherical aberration coefficient can turn to positive, and vice versa. This process also occurs when the beam propagates outside the resonator in a free space. The laser beam, from an oscillator with negative spherical aberration, was found to be well-compensated by the positive spherical aberration of a strongly pumped laser rod in a laser amplifier. The laser beam quality M2 factor has been significantly improved, from 2.2 to 1.4, while the output power has been scaled from 31 W up to 60 W.