采用曲率传感器测量热透镜焦距
Measuring thermal focal length with a curvature sensor
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摘要: 分析了用光栅型波前曲率传感器测量热透镜焦距的基本原理，针对高功率固体激光器的工作特点，结合实验现象推导了在热透镜效应较强时热透镜焦距变化的计算公式。对半导体二极管(LD)侧面泵浦的百W级Nd:YAG激光棒在泵浦电流为15~25 A时的热透镜焦距值进行了测量，讨论了可能存在的误差。实验现象和理论分析一致，测量的热透镜焦距值与理论值符合得较好。Abstract: Thermal focal length of an LD side-pumped Nd:YAG laser rod is measured and discussed. The edge-cooled solid-state laser rod pumped uniformly likes a lens. When the parallel beam goes through the rod, its wavefront will be changed and equal to the focal length. With the wavefront curvature sensor, the wavefront of the beam can be measured exactly. Any equipment should not move and change during the measurement, so that few errors may appear. In this way, the thermal focal length of the pumped laser rod can be measured easily. The experimental result shows that the thermal focal length of high power solidstate laser rod is short, and the theoretical and practical result is close．
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Key words:
- solid-state laser /
- ld side-pumped /
- thermal lens /
- wavefront curvature sensor /
- diffraction grating
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