Frequency locking system and method for continuously tunable laser

Abstract

The invention relates to the laser frequency lock technique, in particular to a method for locking a laser to a tunable transmission peak fiber grating by means of modulation and demodulation to obtain high-frequency stability and tunable performance of the lock wave length of a laser. The method solves the problem that the laser can not be continuously tuned after being locked. Wave length modulation is performed on the laser of the grating, a lock-in amplifier is used for demodulation to obtain frequency discrimination signals, feedback signals are loaded to the modulation port of the laser, and frequency of the laser is locked to the transmission peak of the grating. Tunable wave length output of the lock laser is obtained by changing the environment temperature and regulating the fiber grating transmission wave length. The system and method compress frequency fluctuation of the laser, and achieve continuous tunable laser output with high frequency stability.

Description

technical field [0001] The invention belongs to the field of optics and relates to laser frequency stabilization technology, in particular to a continuously tunable laser frequency locking system, which utilizes modulation and demodulation technology to lock the frequency of the laser to the transmission peak of a narrowband tunable grating to obtain high frequency stability of the laser and locked-in wavelength tunable methods. Background technique [0002] Frequency-stabilized tunable lasers have important applications in the fields of atomic and molecular spectroscopy, precision measurement and optical communication, so many methods have been developed for locking the laser frequency. Locking the laser frequency requires a stable reference source as a frequency standard, and a feedback system is used to lock the laser frequency to the reference source in real time. The usual reference source is the absorption line or fluorescence spectrum of atoms or molecules. This meth...

AI Technical Summary

Problems solved by technology

Since the method of directly locking on the FP cavity does not have the corresponding absorption line as a reference source, some people combine the two methods. First, the reference laser is locked on the atomic or molecular absorption line, and then the FP cavity is locked on the reference laser. Finally, the laser Locked to the FP cavity, but the high-definition FP cavity has a complex structure and is easily disturbed by the external environment. At the same time, there are problems of high cost and difficult maintenance

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