Broadband wide-range locking method and system for repetition frequency of optical frequency comb

Abstract

The invention discloses a broadband large-range locking method and system for the repetition frequency of an optical frequency comb, and the method employs a switch phase discrimination scheme, enlarges the dynamic range of error signal recognition, and enables the repetition frequency locking system of the optical frequency comb not to be liable to lose lock. A fast PI controller is used for controlling an EOM in an optical system to achieve high-speed control over the range of dozens of Hz and the MHz bandwidth, and the short-term stability of repetition frequency locking is improved. The slow PI controller is used for controlling the PZT in the optical system to realize medium-speed control of the bandwidth of dozens of kHz in a range of several kHz, and the medium and long-term stability of repetition frequency locking is improved; and the ultra-slow PI controller is used for controlling the temperature of the cavity of the optical system, low-speed control of the bandwidth lower than 1Hz in the range of dozens of kHz is achieved, and the long-term stability of repetition frequency locking is improved.

Description

technical field [0001] The invention belongs to the field of frequency control, and in particular relates to a broadband wide-range locking method and system for the repetition frequency of an optical frequency comb. Background technique [0002] As an important means of linking optical frequency and radio frequency frequency, the optical frequency comb is by far the most effective tool for absolute optical frequency measurement. It can accurately and simply link the microwave atomic frequency standard with the optical frequency standard. High-frequency, high-precision, and high-accuracy frequency standards provide a carrier, and also provide ideal research tools for scientific research directions such as precision spectroscopy, astrophysics, and quantum manipulation. , remote signal clock synchronization and satellite navigation and other fields have a wide range of application space. [0003] The high-precision locking of the repetition frequency of the optical frequency ...

AI Technical Summary

Problems solved by technology

Although there is currently a method to increase the locking range by resetting parameters such as operating temperature, current, and pump light power when the system is out of the control range, this method is passive compensation, and there are often step changes, which affect the system locking. Stability, if the compensation is not timely, the system may lose lock, which is detrimental to the stability of the optical frequency comb system

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