固体激光腔内放置薄膜偏振片对p偏振光存在4%~5%反射,当激光器输出p偏振光时,退偏损耗光束中包含较强p偏振光,无法测得腔内光束真实退偏率。实验研究Nd∶YAG固体激光在输出p偏振光时,薄膜偏振片对p偏振光反射对腔内光束退偏率测量的影响。结果表明,当损耗光束中所包含p偏振光不被剔除时,不同透射率所对应退偏率曲线间存在较大差异;而当剔除这些p偏振光时,不同透射率所对应退偏率测量曲线趋于一致,测量结果可反映腔内光束的实际退偏率;在激光器输出s偏振光时,其退偏率测量值与当剔除损耗光束中p偏振成分后,输出p偏振光Nd∶YAG谐振腔腔内光束退偏率测量值趋于一致。 Polarizing plate placed in solid laser cavity has 4% ~ 5% reflection on p-polarized light. When the laser outputs p-polarized light, the depolarization loss beam contains strong p-polarized light, so the true de-bounce rate of the cavity beam can not be measured . Experimental study Nd: YAG solid laser output p-polarized light, the film polarizer p-polarized light reflection on the cavity within the beam de-rate measurement. The results show that when the p-polarized light contained in the loss beam is not rejected, the degeneracy curves corresponding to the different transmissivities are greatly different. When the p-polarized light is removed, the de- The curve tends to be consistent, and the measurement result can reflect the actual degeneracy rate of the light beam in the cavity. When the laser outputs the s-polarized light, the measured value of the de-depolarization rate is equal to that of the p-polarized light Nd: YAG The measured values ​​of the de-bounce rate of the beam in the cavity tend to be uniform.