长脉冲泵浦的Nd:YAG激光棒中热效应的测量

报道了一种长脉冲泵浦条件下Nd:YAG激光棒热透镜焦距和温度梯度导致的光走离角测量方法。该方法通过高速相机以5 khz的拍摄频率获取TEM00模He-Ne激光的光斑尺寸和位移变化,运用光学矩阵、q参数和ABCD法则,计算得到了动态热透镜焦距和光走离角。经多组测量发现:热透镜在泵浦期间表现为负透镜,泵浦强度越强焦距越短;在这些测量中出现的最短焦距约为-0.33 m;光走离的变化和热透镜焦距的变化几乎同步;光走离的方向限制在一个特定的子午面内;走离角随泵浦增强而增大,最大走离角同样出现在泵浦结束后,大约为3 mrad。

Measurement of thermal effects in a long-pulse-pumped Nd:YAG laser rod

The thermal lens and temperature-gridient-induced light deviation at a long-pumped Nd:YAG laser rod are measured.A high-speed camera is used to capture the spot size and movement generated from a TEM00 mode He-Ne laser with 5 kHz frame rate.Dynamic focal length of thermal lens and light deviation angle is computed with light transfer matrix,q parameter and ABCD law.The tests show that the thermal lens is negative during the pumping,and the greater the pump intensity,the shorter the focal length;the minimum ...