Method for suppressing intensity noise of high-power continuous wave single-frequency laser

Abstract

The invention relates to a method for suppressing intensity noise of a high-power continuous wave single-frequency laser. The intensity noise spectrum of high-power continuous wave single-frequency laser is changed and inhibited by adjusting the length of a laser resonant cavity of the high-power continuous wave single-frequency laser, inserting a nonlinear crystal into the cavity to introduce nonlinear loss and the material, the length and the doping concentration of a gain medium. According to the invention, methods such as mode locking, electro-optic feedback control, mode cleaner or cascaded mode cleaning, self-injection locking and the like are not needed, and external additional instruments are not needed, so that the cost is effectively reduced, and meanwhile, additional noise is not introduced into a laser system.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a method for suppressing the intensity noise of a high-power continuous wave single-frequency laser. Background technique [0002] Laser has the characteristics of extremely small divergence, high brightness, good monochromaticity, and good coherence. It has been used in many fields of people's production and life since its inception. With the development of the times, in some emerging disciplines such as quantum optics and quantum information, precision measurement, atomic cooling and capture, gravitational wave detection and other fields, people put forward higher requirements for the beam quality of lasers. At the same time, it has low intensity noise. [0003] At present, a variety of laser intensity noise suppression technologies have been developed, such as seed light injection locking technology, photoelectric positive and negative feedback technology, mode cleaning or cas...

AI Technical Summary

Problems solved by technology

This method has little effect on the intensity noise at the laser relaxation oscillation frequency, and even introduces additional thermal noise at two-order Hertz frequencies

[0007] Although the self-injection locking technology can effectively suppress the relaxation oscillation of the laser and the intensity noise at high frequencies, the long-term power stability of the laser will be poor due to the use of the composite cavity structure, especially in the case of all-solid-state lasers. Autonomous injection into the locking system

[0008] By introducing nonlinear loss in the resonator to change the dynamic process of the laser, the intensity noise at the relaxation oscillation of the laser can be effectively suppressed, but this method has little effect on the intensity noise at the high frequency of the laser (laser shot noise benchmark)

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