Double-feedback semiconductor laser frequency stabilization system based on optical frequency comb

Abstract

The invention discloses a double-feedback semiconductor laser frequency stabilization system based on an optical frequency comb. The system carries out the closed-loop feedback control of the frequency of a laser through employing a high-precision wavelength and an acousto-optic modulator. The rough control of a laser output frequency is carried out through a computer and a PID control unit; the laser frequency is shifted by a certain frequency through an acoustic optical modulator and is quickly and accurately controlled, and then the laser frequency is locked in a high-precision and high-stability mode by beating the laser frequency with the optical frequency comb. Finally, the laser with the laser frequency tuned and stabilized serves as pumping laser to be applied to an SERF magnetometer device, the long-term stability of alkali metal atoms pumped by the laser can be guaranteed, so that the detection sensitivity of SERF magnetometer magnetic field measurement is improved. Accordingto the invention, long-term high-precision and high-stability locking of the laser frequency is realized by using the optical frequency comb, and rapid and accurate modulation of the laser frequencycan be realized through constructed double-closed-loop feedback control.

Description

Technical field[0001]The invention relates to the field of semiconductor laser frequency stabilization, in particular to a dual feedback semiconductor laser frequency stabilization system based on an optical frequency comb.Background technique[0002]Semiconductor laser has the advantages of small size, high efficiency, narrow line width, etc., and has been recognized as an ideal light source in atomic physics experiments. With the rapid development of semiconductor laser technology and the continuous improvement of the performance of semiconductor lasers, semiconductor lasers are widely used in experimental systems of quantum optics, quantum sensing, high-precision metrology, laser spectroscopy and high-precision measurement, such as laser cooling And capture, atomic interferometry, atomic clock or optical clock, etc. A stable laser frequency is one of the most important requirements of these experimental systems. In these systems, in order to reduce the frequency drift of the output...

AI Technical Summary

Problems solved by technology

[0005] In order to solve the problem of unstable laser frequency of alkali metal atoms pumped by semiconductor lasers at a certain detuning frequency, the present invention provides a double-feedback semiconductor laser frequency stabilization system based on optical frequency combs

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