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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。
The waste heat is stored in the laser medium during the emission of the solid-state heat-capacity laser so that the temperature of the laser medium rises continuously with the continuous laser emission. The increase of temperature causes the stimulated emission cross section of the laser medium to change. Changes in the effective stimulated emission cross-section lead to changes in laser gain. According to the regularity of the emission cross sections of Nd:YAG doped with 1% Nd: Phosphate doped with Nd: YAG and the change of temperature, the calculated value of the pumping threshold and the output of the solid heat capacity laser with the corresponding working medium Power change. The calculated results show that Nd: YAG and Nd:YAG work in the heat capacity mode, the effective stimulated emission cross section decreases with temperature rise, and the laser output power decreases obviously.