Self-adaptive beat frequency locking system of fiber laser

Abstract

The invention relates to a fiber laser self-adaptive beat frequency locking system. Beat frequency locking is carried out on an optical fiber laser with the frequency to be locked and a reference laser frequency, and the beat frequency of the optical fiber laser and the reference laser frequency is locked on a microwave frequency traceable to an atomic clock by means of an OPLL (Optical Phase Locked Loop), so that frequency difference controllable following locking between the optical frequency of the laser to be locked and the optical frequency of the reference laser is kept. Besides, aiming at the control bandwidth limitation of the fiber laser, a feedforward control method is adopted to improve the OPLL performance, the rapid frequency hopping and rapid locking of the laser to be locked can still be realized under the limitation of small loop bandwidth, and relatively high frequency stability is kept during frequency locking. Finally, the system is further provided with a control port and an upper computer control interface, automatic preparation work before frequency locking, target frequency difference setting and locking switch switching can be rapidly completed by pressing a key, and meanwhile key parameters of the system are monitored and displayed in real time through a control module.

Description

technical field [0001] The present application relates to the field of laser technology, in particular to an adaptive beat frequency locking system for fiber lasers. Background technique [0002] Single-frequency fiber lasers have the advantages of narrow linewidth, no mode hopping, low frequency drift, small size and simple structure, and have been widely used in many fields such as optical sensing, lidar and quantum information. In many precision measurement fields, not only the frequency of the fiber laser needs to be locked, but also the phase-lock or frequency-lock of two lasers is often required. Mann light, laser frequency locking based on optical frequency comb, etc. [0003] For single-frequency fiber lasers, the wavelength tuning in the cavity mainly relies on thermal tuning with slow response and piezoelectric effect (PZT) mechanical tuning with kHz bandwidth. At present, the phase-locking technology of single-frequency fiber lasers cannot be realized only by PZ...

AI Technical Summary

Problems solved by technology

However, since the laser used here is a fiber laser, the PZT tuning bandwidth is small, so the locking time is slow and the accuracy is low during frequency hopping, and it takes tens or even hundreds of milliseconds to achieve the ideal locking target, which is difficult to meet the needs of many application backgrounds. Frequency Hopping Lock Requirements

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