A broadband and wide-range locking method and system for optical frequency comb repetition frequency

Abstract

The invention discloses a broadband and wide-range locking method and system of the repetition frequency of an optical frequency comb. The invention adopts the switch phase detection scheme to increase the dynamic range of error signal identification, so that the repetition frequency locking system of the optical frequency comb is not easy to lose lock. . Use the fast PI controller to control the EOM in the optical system to achieve high-speed control in the range of tens of Hz and MHz bandwidth, and improve the short-term stability of repetition frequency locking; use the slow PI controller to control the PZT in the optical system to achieve a range of several kHz and tens of kHz The medium-speed control of the bandwidth improves the mid- and long-term stability of the repetition frequency locking; the ultra-slow PI controller is used to control the temperature of the optical system cavity to achieve low-speed control in the range of tens of kHz and less than 1Hz bandwidth, and improve the long-term stability of the repetition frequency locking Spend.

Description

technical field [0001] The invention belongs to the field of frequency control, and in particular relates to a broadband and wide-range locking method and system of an optical frequency comb repetition frequency. Background technique [0002] As an important means of linking optical frequency and radio 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. The frequency standard of high frequency, high precision and high accuracy provides a carrier, and also provides an ideal research tool for scientific research fields such as precision spectroscopy, astrophysics, and quantum manipulation. , remote signal clock synchronization and satellite navigation and other fields have a wide range of applications. [0003] High-precision locking of the repetition rate of an optical frequency comb is the basis for th...

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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