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LD端面泵浦固体激光器具有结构紧凑,效率高,输出光质量好等优点,但LD端面泵浦结构下激光晶体内部的温度梯度较大,热效应显著。本文建立了激光增益介质的热传导模型,计算泊松方程,最终求出块状和板条状增益介质内部温度场分布,并求解了热透镜产生后所形成的光程差和其焦距。结果表明,较块状晶体,板条状晶体呈现一维温度场分布,且泵浦中心的温度远低于块状晶体,从而较好的改善了影像输出光质量的晶体热透镜效应。在相同谐振腔和泵浦光参数下,板条晶体泵浦激光器的光束质量的得到明显改善。
LD end-pumped solid-state lasers have the advantages of compact structure, high efficiency and good output light quality. However, the temperature gradient inside the laser crystal under the LD end-pumped structure is large, and the thermal effect is remarkable. In this paper, the heat conduction model of the laser gain medium is established. The Poisson’s equation is calculated. Finally, the temperature field distribution inside the bulk and slab gain medium is calculated, and the optical path difference and its focal length are calculated. The results show that, compared with bulk crystal, the lath crystal presents one-dimensional temperature field distribution, and the temperature in pump center is much lower than that of bulk crystal, so the crystal thermal lens effect of image output light quality is better. Under the same resonant cavity and pump parameters, the beam quality of the slab crystal pumped laser is significantly improved.