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对全固态SESAM锁模激光器的锁模特性进行了理论研究。基于抑制调Q锁模理论模型和结合全固态LD抽运的Yb:YAG激光器等,数值模拟分析了在不同调制深度、非饱和损耗、饱和通量和输出镜透射比等参数下的SESAM的反射率,以及抑制调Q锁模所需要的临界抽运功率。以同样的脉冲通量入射到SESAM上,SESAM的调制深度、非饱和损耗和饱和通量与它的反射率都呈一个反比关系。调制深度、饱和通量、输出镜透射比、激光光腰和腔长的减小都会降低临界抽运功率,使其更容易抑制调Q锁模。在晶体长度为1.9 mm时,可获得最小临界抽运功率。
Theoretical studies on the mode-locking properties of all-solid-state SESAM mode-locked lasers are carried out. Based on the theoretical model of Q-switched mode-locked and the Yb: YAG laser combined with all-solid-state LD pumping, the SESAM reflections under different modulation depth, saturation loss, saturation flux and output mirror transmittance were numerically simulated Rate, as well as the critical pumping power required to suppress Q-mode clamping. With the same pulse flux incident on the SESAM, SESAM modulation depth, saturation loss and saturation flux and its reflectivity are in an inverse relationship. Modulation depth, saturation flux, output mirror transmittance, laser waist and cavity length decrease will reduce the critical pumping power, making it easier to suppress the Q-switched mode. The minimum critical pumping power is obtained at a crystal length of 1.9 mm.