可移动光学超稳腔的研制及其稳定性测试

可移动超稳腔可以减小环境振动对激光稳定性带来的影响,适合振动强度较大的运输条件。本文展示了一种由低膨胀系数玻璃制作的光学谐振腔,并测试了激光锁定到该可移动超稳腔的频率稳定性。支杆固定于金属热屏蔽罩内的机械设计使其具有良好的稳定性和可移动性。采用短延迟自外差干涉法测量了激光器锁定到超稳腔后的线宽,并且借助振动平台测试其稳定性。实验发现锁定后的激光器线宽和振动频率存在线性关系,激光器线宽会随着振动加速度增大出现饱和效应。去除振动时激光线宽可以恢复到无振动时的数值,证实该超稳腔具有较高稳定性。

Development and stability test of movable ultra stable optical cavity

The movable ultra stable optical cavity can reduce the influence of environmental vibration on laser stability,and suitable for transportation conditions with high vibration intensity.This paper demonstrates an optical resonator made of ultra low expansion coefficient glass,and the frequency stability of the laser locking to the movable ultra stable cavity is tested.The mechanical design of the struts fixed inside the metal heat shielding provides good stability and mobility.In this paper,the laser linewidth locking to the super stable cavity is measured using short delay heterodyne interferometry and its stability is tested with the help of a vibration platform.It is found that the laser linewidth is lineally dependent on the vibration frequency and gradually increases to a saturated valued with the increase of vibration acceleration.The laser line width can be restored to the value in the absence of vibration when the vibration is removed,confirming the high stability of the super stable cavity.