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固体激光器中的热致双折射效应严重地限制了基模输出功率的提高,为了获得大功率高质量的激光输出,需要对热致双折射效应进行补偿.在理论上对双棒在腔内串接补偿热致双折射效应的条件进行了改进,通过设计合理的腔结构和腔内元器件,应用4f成像系统空间滤波器并考虑石英旋光器的厚度,使得腔内光束的退偏率降至2.5%以下.使用矩阵光学的方法简化了对含有这样一个复杂光学系统的谐振腔稳定性和腔内光束半径等特性的分析.通过在腔内加入一个正透镜来扩大基模体积,实验中在双氪灯连续抽运Nd∶YAG激光器中得到了61 W线性偏振的激光基模输出,表明在大基模体积谐振腔的设计中,双折射效应的补偿十分必要.
Thermal birefringence in solid-state lasers severely limits the output power of the fundamental mode, and in order to obtain high-power and high-quality laser output, it is necessary to compensate the thermal induced birefringence effect. Theoretically, The condition of compensating thermal induced birefringence effect is improved. By designing a reasonable cavity structure and cavity components, the 4f imaging system spatial filter is used and the thickness of the quartz optical rotator is taken into account, so that the degeneracy rate of the optical beam in the cavity is reduced to 2.5%. The use of matrix optics simplifies the analysis of the stability of a cavity containing such a complex optical system and the characteristics of the cavity beam radius by adding a positive lens cavity to expand the base mode volume in the experiment in The birefringent lamp output of 61 W linearly polarized laser based on Nd: YAG laser is obtained. It shows that it is necessary to compensate the birefringence effect in the design of a large fundamental cavity.