一种望远镜热不灵敏腔的设计

Design of A type of telescopic heat-insensitive resonator

给出了一种简单的双透镜望远镜型热不灵敏腔的设计方法,仅需移动凹透镜调节离焦量的大小,就可以对不同功率下的热效应进行补偿,设计了一组双透镜望远镜型热不灵敏腔参数,通过数值模拟给出了在不同泵浦功率下,热焦距,双透镜之间距离和输出镜光斑W2的三维关系图,并给出了最佳离焦量偏差对输出镜上光斑大小的影响,结果表明:热焦距对光斑影响非常小,同时允许有一定的最佳离焦量的偏差。该望远镜腔不仅可以补偿热效应产生的输出功率不稳定现象,同时大大提高了输出功率,具有很好的实验可操作性。

A simple design method of two-lens telescopic heat-insensitive resonator is presented in this paper.Thermal lens effect in different pumping power can be compensated only by moving the concave len to adjust the de-focusing amount.A set of parameters of two-lens telescopic heat-insensitive resonator is designed.Through numerical simulation,three-dimensional diagram is given,reflecting the relationship of the thermal focal length,distance be-tween the two lens and the spot size in the output mirror at different pumping power.The effect of the deviation of the best defocusing amount on the spot size in the output mirror is numerical simulated.The result shows that：the impact of thermal focal length on the spot size is very small,while allowing a certain amount of deviations of the de-focusing amount.The telescope resonator can not only compensate instability of the output power inducing by thermal effects,at the same time greatly improve the output power.This kind of resonator is maneuverable.