Laser improving weak pump laser efficiency based on light polarization torsion

Abstract

The invention provides a laser improving weak pump laser efficiency based on light polarization torsion, which relates to the field of lasers and solves the problem of low laser conversion efficiency of existing lasers. The laser comprises two totally reflecting mirrors, a 1 / 4 wave plate, a laser gain medium, polarizer, an output mirror and a pump source. According to the laser provided by the invention, oscillating light passes by the laser gain medium for four times within a round-trip time of a resonant cavity of the laser by means of the light polarization properties, at this time, 4gl is larger than L-lnR, wherein g refers to a gain of the laser gain medium, l refers to the length of the laser gain medium, L refers to inherent loss of the laser, R refers to the reflectivity of the output mirror, and oscillation output of the laser is realized; and when the loss of the resonant cavity of the laser is invariable, the laser gain is merely a half of the original laser gain, a pump threshold of the resonant cavity of the laser is reduced to a half of the original pump threshold, the laser conversion efficiency is improved while reducing the pump threshold of the resonant cavity of the laser, the decreasing amplitude of the pump threshold of the resonant cavity of the laser is at least 50%, and the laser is output more easily, therefore the low-power pump laser conversion efficiency is greatly perfected.

Description

technical field [0001] The invention relates to the technical field of lasers, in particular to a laser that improves the efficiency of a weak pump laser based on light polarization twisting. Background technique [0002] The two key factors for lasers to achieve output are population inversion and laser resonators, where the laser resonators are used to achieve positive feedback. The form of laser resonator is divided into standing wave cavity and ring cavity. The standing wave cavity is composed of high reflection mirror and output mirror, while the ring cavity is composed of multiple total reflection mirrors and output mirror. During the round-trip time of the two resonators, the oscillating light passes through the laser gain medium twice and the output mirror once. When the laser gain is greater than the loss of the resonator, the laser achieves oscillation output, that is, 2gl>L-lnR, where g is the gain of the laser gain medium, l is the length of the laser gain me...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the problem of low laser conversion efficiency existing in existing lasers, the present invention provides a laser that improves the efficiency of weak pump lasers based on light polarization twisting

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