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固体激光器在强抽运的条件下,激光晶体热透镜的球差效应是不容忽视的,尤其是在大基模体积的动态稳定腔中,会影响谐振腔的振荡模式,进而影响腔内损耗和输出功率.通过Fox-Li的衍射迭代算法,分析了谐振腔的自再现模,表明在热透镜球差效应作用下,基模的光强分布出现了旁瓣,并由此带来了光束质量的下降,最后通过实验结果验证了理论分析,指出光束填充因子是激光器设计的一个重要因素,其最佳值需要根据球差效应的强弱,通过实验的方法来确定.
Under the condition of strong pumping, the spherical aberration effect of the laser crystal thermal lens can not be neglected, especially in the dynamic stability cavity of the large fundamental mode volume, which will affect the oscillation mode of the resonator and further affect the cavity loss and Output power.The self-recurrence mode of the resonant cavity is analyzed by means of the Fox-Li diffraction iteration algorithm, which shows that under the effect of the spherical aberration of the thermal lens, the side-lobe appears in the light intensity distribution of the fundamental mode and the beam quality Finally, the theoretical analysis is verified by the experimental results. It is pointed out that the beam fill factor is an important factor in laser design. The optimal value needs to be determined experimentally according to the effect of spherical aberration.