参考腔模式匹配及其在激光稳频中的应用

Mode-matching of optical reference cavity and its application to laser frequency stabilization

窄线宽激光器是光钟的核心部件,也是原子光精密测量的关键仪器。利用参考腔的功率反射率和功率透射率与损耗的关系给出了窄线宽激光器系统稳频中腔镜损耗的理论表达式。对腔镜的实际反射率与损耗进行了实验测量和计算。实验结果表明,优化模式匹配效率,可以进一步减小腔镜损耗。更重要的是,腔镜损耗的优化有助于提高稳频的锁定质量。

The sub-hertz linewidth laser is the key part of optical clock and also the important instrument for precise optical measurement of atoms. We show the theoretical expression of the cavity mirror loss using the relation between the power reflectivity and transmission as well as the loss of the cavity mirrors. We experimentally measured and calculated the reflectivity and loss for the substrate mirror of the pre-stable cavity. The experiments show that optimizing the matching efficiency can decrease the practical loss of the cavity, and it is more important that reducing the loss of the cavity may improve the stability of locking loop.