热容激光器中热致受激发射截面改变对输出功率的影响  

Effect of Thermally Induced Change of Stimulated Emission Cross Section in Heat Capacity Lasers

作　　者：汪晓波[1] 许晓军[1] 陆启生[1] 

机构地区：[1]国防科技大学光电科学与工程学院,湖南长沙410073

出　　处：《中国激光》2009年第1期43-46,共4页Chinese Journal of Lasers

基　　金：国家自然科学基金(60378009)资助项目

摘　　要：固体热容激光器发射期间将废热储存在激光介质中,从而使激光介质的温度随着激光的不断发射而不断升高。温度的升高导致激光介质的受激发射截面发生改变。有效受激发射截面的改变导致激光增益的变化。根据各种掺钕磷酸盐玻璃和掺杂原子数分数为1%的Nd∶YAG的发射截面随温度变化的规律,计算出使用相应工作介质的固体热容激光器随温度上升后抽运阈值和输出功率的改变。计算结果表明,掺钕磷酸盐玻璃和Nd∶YAG介质工作在热容模式下,随着温升导致的有效受激发射截面不断减小,激光器输出功率明显下降。During lasing process, the active medium is not cooled actively in heat capacity laser, so the temperature of the active medium increases sharply. As a result of the decreasing stimulated emission cross section with increasing temperature, the laser gain declines obviously. Based on the relation between the temperature and the stimulated emission cross section of Nd： phosphate and 1% doping Nd： YAG, the changes of power output and pump threshold in heat capacity lasers are calculated. The results show that the power output declines obviously and the pump threshold rises sharply with increasing temperature in heat capacity lasers because of thermally induced change of stimulated emission cross section.

关 键 词：激光器 热容激光器 受激发射截面 数值计算 

分 类 号：TN248.1[电子电信—物理电子学]