侧面抽运光参数对DPL激光器增益分布的影响

摘要

In order to research the gain distribution characteristics of the DPL by the side-pumped light and analyze the configuration of the side-pumped light ,the infection of the single side-pumped light and the three side-pumped light parameters to the gain distribution of laser crystal is calculated .The result shows:The gain of crystal axes is larger when the waist radius is smaller ,and the radial gain distribution is concentrated around the vertical axes;The gain distribution is symmetrical preferably when the absorption coefficient is smaller ,but the total absorb efficiency descends ;The crystal can not completely absorb the energy of pumped light when the absorption coefficient and the pumped light waist radius are tool small ;Reflect film is need to plate on the crystal side face to improve the efficiency of the absorption of pumped light .%为了研究侧面抽运固体激光器时激光工作晶体中的增益分布特性，分析了侧面抽运结构特点，采用数值计算方法计算了单向侧面和三向侧面抽运光参数对激光晶体中增益分布的影响。研究结果表明：抽运光束腰半径越小，激光晶体的轴线上增益越大，激光晶体径向增益分布越集中；晶体的吸收系数越小，激光晶体中抽运均匀性就越好，但总的吸收效率下降；在吸收系数和束腰半径过小时，激光晶体不能完全吸收抽运光的能量，抽运光利用率降低；此时在晶体侧面抽运光出射面增镀抽运光的增反射膜，能提高抽运光的能量利用效率。