一种V型固体激光腔的热动力图解分析

采用图解分析方法分析一种常用于内腔倍频V型折叠固体激光腔在热透镜作用下的工作特性;得到谐振腔两臂中的光模参数bt,b2及束腰尺寸wt,w2随激光介质的焦距ft的变化关系.结果表明:这种谐振腔具有较宽的热稳定范围,而且在ft=l0处未出现无法运行的高损耗区;其热稳定范围及基模光斑尺寸可通过调整腔参数来改变,其关键参数为第一臂的长度l0 f,在选定腔镜的前提下,l0 f愈小,热稳定范围愈宽,同时wt愈小.在腔内插入一定厚度的布儒斯特片可以部分消除腔的像散.

Thermal dynamical graphic analysis of a V type solid laser resonator

To analyze the working characteristic under the effect of thermal lens of laser medium of a V type folded laser resonator,a graphic analyze method is used.Relationship of laser mode parameters b_t,b_2 and beam waists w_t,w_2 varies from focal length of thermal lens were obtained.The results have shown this type of resonator has a wider thermal stable range compare with other similar resonator,and no high loss region when the dynamics factor f_t approaches l_0.The stable range and beam radius can be changed by adjusting the parameter of resonator.And the length l_0 f of first arm is a key parameter,for given parameters of(resonator mirrors,) the shorter l_0 f,the wider thermal stable range,and smaller w_t is.The resonator(astigmatic) can be compensated by inserting a suitable thickness Brewster plate in the cavity.