Control system and control method for locking laser frequency under large tuning quantity and high precision

Abstract

The invention discloses a control system and a control method for locking laser frequency under large tuning quantity and high precision. According to the control method disclosed by the invention, a master laser and a slave laser are adopted, and a beat frequency signal is obtained by beam combination; the injection current of the slave laser is adjusted to control the output frequency of the slave laser so as to control the frequency of the beat frequency signal; two control loops, namely, frequency locking and phase locking, are combined by utilizing a CPLD to achieve the target of controlling the laser frequency within a large dynamic range and under high precision at the same time; and the output light frequency of the slave laser is accurately locked with the output light frequency of the master laser as reference, and thus the output light frequency of the slave laser is controlled under large tuning quantity and high precision. By adoption of the control system and the control method disclosed by the invention, fast laser frequency turning and locking under high tuning quantity (higher than 40GHz) and high precision (1Hz) can be realized; and the method disclosed by the invention can be widely applied to the technical field of fundamental researches and precision measurement such as laser cooling, atomic frequency standard, atomic interferometer, etc.

Description

technical field [0001] The invention belongs to the technical field of optoelectronics, and in particular relates to a control system and a control method for locking laser frequency with a large tuning amount and high precision. Background technique [0002] In laser precise control of atoms and laser-related precision measurement scenarios, it is usually necessary to adjust the laser frequency in a wide range, and at the same time, it is necessary to ensure the high precision of the laser frequency. [0003] Usually, for a laser, it is difficult to achieve wide-range tuning and high-precision locking of laser frequency at the same time. In order to adjust the laser frequency in a wide range, the common method is to adjust the length of the laser external cavity, the temperature of the die or the injection current. However, due to the low stability of the external cavity, the limited control accuracy of temperature and current, and the mode hopping of the laser tube, etc., ...

AI Technical Summary

Problems solved by technology

[0004] Aiming at the problems existing in the current laser frequency control technology, the present invention proposes a control system and a control method for controlling the laser frequency with a large amount of tuning and high precision; there are two commonly used methods for controlling the beat frequency: frequency locking and phase locking. Frequency locking can achieve large dynamic range tuning, but the control accuracy is not high; phase locking can achieve high-precision frequency locking, but it cannot satisfy large dynamic range tuning at the same time

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