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超低损耗光学镜片(超镜)是构建高品质光学腔和进行许多光学测量的重要器件,对损耗在百万分之一水平的高质量镜片的测量是一个重要的课题。通过在扫描腔长的情况下调节腔的起振模式,然后在腔的TEM_(00)模式附近扫描激光频率实现了注入激光和腔的TEM_(00)模的有效匹配;以迟滞比较电路触发下的光开关控制注入光场的方式获得了连续激光光腔衰荡信号;实验中完成了同一批损耗在10~(-6)量级的超高反射率镜片的批量测量,实测最高反射率镜片的反射率为(99.99914±0.00004)%,测量精度优于10(-6),结果表明对于同一批相同工艺生产以及相同存储环境存放的超镜,其损耗也存在较大差异。
Ultra-low-loss optical lenses (ultra-mirrors) are important components in the construction of high-quality optical cavities and in many optical measurements. The measurement of high-quality lenses with losses in the millionth level is an important issue. The effective matching of the TEM_ (00) mode of the injected laser and the cavity is achieved by adjusting the mode of the cavity oscillation with the length of the scanning cavity and then scanning the laser frequency near the TEM_ (00) mode of the cavity. With the hysteresis comparison circuit being triggered Of the optical switch to control the injection of light field to obtain a continuous laser cavity ring-down signal; the experiment completed the same batch of loss in the 10 -6 (-6) order of magnitude of the ultra-high reflectivity lens bulk measurement, measured the highest reflectivity lens (99.99914 ± 0.00004)% and the accuracy of measurement is better than 10 (-6). The results show that there is a big difference in the loss between super-mirrors stored in the same batch and in the same storage environment.