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 stabili-ty,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-sta-ble 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 hetero-dyne 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 vibra-tion acceleration.The laser line width can be restored to the value in the absence of vibration when the vibration is re-moved,confirming the high stability of the super-stable cavity.
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