针对传统光束质量测量方法中等距传播面上光场信息采集耗时长、效率低等问题,提出一种非等距双向传播的光束质量测量方法。基于非等距传播步长的更新条件建立非等距双向传播模型,实现激光传播廓形拟合中传播步长的迭代,完成光束质量的测量。实验结果表明:非等距双向传播模型的光束质量测量误差为±1.9%。该方法可有效提高光束质量测量的效率。

Traditional beam-quality measurement methods face problems such as excessive time consumption and low efficiency of optical field information acquisition on the equidistant propagation plane; to combat these, a non-equidistant and bidirectional propagation method to determine beam quality is proposed. A non-equidistant and bidirectional propagation model is established by updating the condition of non-equidistant propagation step, while the iteration of the propagation step in the fitting of laser propagation profile is realized to determine beam quality. Experimental results show that the error of beam-quality measurement is ±1.9% in the non-equidistant and bidirectional propagation model. The proposed method can effectively improve the efficiency of laser beam-quality measurement.