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研究了端面抽运Nd∶YAG晶体的抽运面形变场分布,采用一种新的测量端面形变场分布的实验方法———光束扫描法。让参考光沿晶体的端面小步距扫描,比较有无抽运光时各扫描点在探测面上光点位置的移动情况,通过几何分析与数值计算,可逐段得到端面的形变场分布。通过与理论上在理想模型下所求解的结果比较,发现实验值与理论值基本一致,晶体的端面形变场最大峰值处的抽运光在端面的聚焦位置处。另外发现端面的形变场分布的对称性受抽运光对称性影响,且曲线不光滑。该方法解决了端面抽运Nd∶YAG晶体的抽运面形变场分布难以测量的问题,且易于实现和操作。
The distribution field of pumping face of end-pumped Nd:YAG crystal was studied. A new method of beam-scanning was used to measure the deformation field of end face. The reference light is scanned along the end face of the crystal in small steps to compare the movement of spots on the detection surface with or without pumping light. The deformation field distribution of the end face can be obtained by geometric analysis and numerical calculation. Comparing with the theoretical solution, the experimental value is basically consistent with the theoretical value, and the pump light at the maximum peak of the deformation field is in the focal point of the end face. In addition, it is found that the symmetry of the deformation field of the end face is affected by the symmetry of pumping light, and the curve is not smooth. The method solves the problem that the deformation field distribution of the pumping face of the end-pumped Nd:YAG crystal is difficult to measure and is easy to implement and operate.