固体激光器中泵浦光束尺寸优化

Optimization of Pump Size of Solid-state Laser

热效应是限制固体激光器输出功率提高的关键因素,为进一步减小热效应,研究了热致衍射损耗和泵浦光束半径之间的关系,引入了激光介质实际温度因子.实验中选用Nd∶GdVO4为激光介质,并通过简易平凹谐振腔实现1 342nm波段的红外激光.研究结果表明:在激光介质实际温度的影响下,热致衍射损耗为泵浦光束半径的显著减函数.可以通过优化泵浦光束半径减小热致衍射损耗并提高激光器输出功率.优化的泵浦光束半径为300μm,对应的输出功率为10.4 W,较前期激光器输出功率提高10%.

Thermal effect is the key factor to confine the output power of solid-state lasers.To reduce the thermal effect and raise the output power of solid-state lasers,the thermally induced diffraction loss as the function of pump beam radius was investigated with the real temperature of laser medium introduced.The crystal Nd∶GdVO4 was selected as the laser medium,and a simple plane-concave resonator was employed to achieve the infrared laser at 1 342 nm.The results show that,if the real temperature of laser medium is considered,the thermally induced diffraction loss is the decreasing function of pump size.The output power can be enhanced by optimizing the pump beam radius to reduce the thermally induced diffraction loss.The optimum pump beam radius is 300μm,the maximum output power of 1 342 nm laser is 10.4 W,which has been increased by 10%.