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为研究腔参数和石墨烯的可饱和吸收特性对脉冲特性的影响,数值求解了描述激光器动力学的Haus主方程。采用饱和吸收体的快饱和模型,分析了谐振腔腔长、石墨烯层数、输出镜透射率和激光晶体上光斑半径的变化对脉冲特性的影响,并与半导体可饱和吸收镜(SESAM)做了比较。结果表明,石墨烯和SESAM各具优势,例如在腔长短且可饱和吸收体上光斑半径小时选择石墨烯,在腔长长且光斑半径大时选择SESAM,分别能获得峰值功率更高的脉冲激光。故应根据具体的实验情况选择适当的可饱和吸收体和腔参数。
In order to study the influence of the cavity parameters and the saturable absorption of graphene on the pulse characteristics, the Hausdorff equation describing the laser dynamics was numerically solved. The fast saturation model of saturable absorber was used to analyze the effects of cavity length, graphene layer number, output mirror transmittance and laser spot radius on the pulse characteristics. The results were compared with the SESAM A The results show that graphene and SESAM have their own advantages. For example, graphene is selected when the spot radius is small on a short and saturable absorber, and SESAM is selected when the cavity length is large and the spot radius is large, to obtain pulsed lasers with higher peak powers . Therefore, according to the specific experimental conditions, select the appropriate saturable absorber and cavity parameters.