Feedback locking structure capable of simultaneously realizing laser frequency stabilization and noise suppression

Abstract

The invention relates to the technical field of lasers, and discloses a feedback locking structure capable of simultaneously realizing laser frequency stabilization and noise suppression. On one hand,an atomic saturation absorption light path and a servo circuit for the feedback control of a laser piezoelectric ceramic control end are adopted in a first feedback locking loop, so that the laser frequency of the laser can be locked on a spectral line of the atomic saturation absorption spectrum, and the purpose of frequency stabilization is achieved; on the other hand, an optical fiber interferometer and a servo circuit for the feedback control of a laser current modulation end are adopted in a second feedback locking loop, so that the signal noise of the laser can be effectively suppressed, the purpose of noise suppression is achieved. Meanwhile, compared with an existing laser line width suppression scheme, an optical structure is greatly simplified, the overall size is reduced, the precise matching of a light path and a space mode of a reference cavity is not needed, and the implementation difficulty is reduced. In addition, the feedback locking structure also has the advantagesof easiness in integration, no need of free space optical path adjustment, low environmental parameter sensitivity and the like.

Description

technical field [0001] The invention belongs to the technical field of lasers, and in particular relates to a feedback locking structure for simultaneously realizing laser frequency stabilization and noise suppression. Background technique [0002] In the atomic clock technology, the use of a narrower linewidth laser to detect the transition signal of the atomic clock can improve the signal-to-noise ratio of the signal, thereby improving the frequency stability of the atomic clock. In the detection of atomic clock transition signals, the absorption method is widely used; the absorption method belongs to the amplitude detection, so the amplitude noise of the detection light is required to be very low. In absorption detection, the laser passes through the atomic medium, which will cause the electric susceptibility of the medium to fluctuate with the laser frequency noise. The fluctuation of the electric susceptibility will introduce the fluctuation of the laser light intensit...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of complex optical structure and large volume in the current laser linewidth narrowing scheme, the purpose of the present invention is to provide a feedback locking structure that simultaneously realizes laser frequency stabilization and noise suppression

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