Laser

Abstract

The invention relates to the laser field, in particular to the laser structure. The laser comprises a pump cavity, a pump light source, an optical coupling system and other optical elements, wherein the pump cavity is provided with a light-admitting hole at the pump point, the other part of the pump cavity is all coated with a reflective coating, and the position of the pump light source corresponds to the light-admitting hole. An enclosed cavity which has high reflectivity to the pump light is formed by the pump cavity except the light-admitting hole, therefore, the pump light is reflected by a plurality of times in the enclosed cavity, and most of the pump light is absorbed by a laser gain medium except that a little bit of the pump light escapes from the light-admitting hole of the pump light. The structure of the invention is beneficial to improving the absorption efficiency of the gain medium on the pump light; can be applied to manufacture lasers with wide temperature operation range for reducing or eliminating the influence on the laser power due to the semiconductor laser wavelength shift caused by temperature change; and can reduce the volume of the laser gain medium and simultaneously reduce the laser threshold as the length of the laser gain medium can be shorter.

Description

technical field [0001] The invention relates to the field of lasers, in particular to laser structures. Background technique [0002] LD-pumped solid-state lasers are widely used due to their advantages of high efficiency, good beam quality, long life, compact structure, and high repetition rate. However, the light emitted by LD has a large divergence angle. When using LD or LD array for end-face or side pumping, it needs to be collimated and converged efficiently. At present, the coupling methods such as lens group, fiber coupling, lens light guide and self-focusing microlens are mainly used, but the coupling method will cause the loss of pump light, limit the energy conversion efficiency of the laser, and especially have the disadvantages of complex structure and high cost. And the commonly used LD pumping method, the pump light can only pass through the gain medium once or twice, for the gain medium with low absorption coefficient, or when the pump wavelength is not in t...

AI Technical Summary

Problems solved by technology

At present, the coupling methods such as lens group, optical fiber coupling, lens light guide and self-focusing micro-lens are mainly used, but the coupling method will bring the loss of pump light, limit the energy conversion efficiency of the laser, and especially have the disadvantages of complex structure and high cost.

And the commonly used LD pumping method, the pump light can only pass through the gain medium once or twice, for the gain medium with low absorption coefficient, or when the pump wavelength is not in the absorption center band of the gain medium, most of the pump light energy is wasted

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