All-fiber continuous light and optical frequency comb locking device

Abstract

The present invention relates to an all-fiber continuous light and optical frequency comb locking device which comprises an optical frequency comb, a continuous laser, a beat frequency apparatus, a frequency shift apparatus, a reference signal source, a frequency synthesizer and a fast phase-locked loop circuit. The optical frequency comb can ensure system long-time stable operation, and repetition frequency and carrier-envelope phase shift frequency of the optical frequency comb are locked to a stable reference signal source; the continuous laser can be an external cavity semiconductor laser or a continuous optical fiber laser, and is used for locking continuous light to some comb tooth of the precision optical frequency comb; and input and output terminals of the frequency shift apparatus and the beat frequency apparatus are connected by using polarization maintaining optical fiber, and the frequency shift apparatus and the beat frequency apparatus are used for assisting completely overlapped locking of the continuous light and the optical frequency comb. The all-fiber continuous light and optical frequency comb locking device has a compact and small structure; the beat frequency structure is simple and easy, and the signal to noise ratio is high; locking is good in stability and high in precision; and the continuous light can be ensured to be completely overlapped with some comb tooth of the optical frequency comb, so that completely overlapped locking can be achieved.

Description

technical field [0001] The invention relates to the field of ultrafast laser precision measurement, in particular to a locking device for all-fiber continuous light and an optical frequency comb. Background technique [0002] In recent years, with the continuous development of optical frequency comb technology, optical frequency combs have been widely used in many fields such as high-precision resolution laser spectroscopy, measurement of fundamental physical constants, optical atomic clocks, absolute distance measurement, and low-noise microwave signal generation. Among these wide-ranging applications, the locking of continuous light and optical frequency comb is an essential technology. Therefore, in order to obtain a high-performance locking method in which the continuous light and a certain comb tooth of the optical frequency completely coincide, it has been widely concerned by people. [0003] The traditional method to realize the locking of continuous light and optica...

AI Technical Summary

Problems solved by technology

[0005] 1. In the traditional method, there is an interval between the continuous light and a certain comb of the optical frequency comb, and it is impossible to achieve complete coincidence.

[0006] 2. The spatial optical path is sensitive to spatial physical jitter and has poor anti-noise ability, which seriously affects the locking effect

[0007] 3. It is difficult to adjust the beat frequency, and the signal-to-noise ratio of the beat frequency signal is poor, and the response requirements for the feedback servo circuit system are high

[0008] In short, the traditional technology has great difficulty in realizing the complete coincidence locking of high-performance continuous light and optical frequency comb

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