High-power laser resonance cavity

Abstract

The invention consists of a totally reflecting mirror, an output mirror and a laser working medium. The totally reflecting mirror consists of medial surface of first right angle truncated cone and the lateral surface of the reverse right angle taper cone. The first right angle truncated cone and the right angle taper cone have coaxial symmetry axis of rotation , their medial surface and lateral surface all are highly reflective surface. The output mirror is composed of round plane beam splitter and totally reflecting mirror in concentric ring shape, and they have coaxial symmetry axis of rotation. The totally reflecting mirror in concentric ring shape is composed of the medial surface of the second right angle truncated cone and the lateral surface of third right angle truncated cone, and both right angle truncated cone have coaxial symmetry axis of rotation, and their medial surface and lateral surface all are highly reflective surfaces.

Description

technical field [0001] The invention relates to laser resonators. Background technique [0002] In many occasions of laser applications, such as laser drilling, welding, cutting, and laser medical micro-precision processing, it is hoped that the laser can best work in the fundamental mode state with the smallest divergence angle. In order to improve the quality of the laser beam, traditional mode selection techniques (such as using an aperture stop) can improve the quality of the laser output beam, but the use of an aperture stop limits the mode volume to a large extent and increases the mode loss. [0003] The main problem in the design of high-power laser devices is how to obtain the largest possible mode volume and good transverse mode discrimination ability to achieve high-power single-mode operation, so as to extract energy efficiently from the active material and Can maintain high beam quality. [0004] There are three types of laser resonators: stable cavity, unstab...

AI Technical Summary

Problems solved by technology

The main disadvantages of the parallel plane cavity are: the adjustment accuracy is extremely high and it is easy to misalign. Compared with the stable cavity, the loss is also large, and it is not suitable for small gain devices.

However, the disadvantages of these two types of resonators are: the influence of the uneven distribution of the center and edge of the gain medium cannot be eliminated; the area of ​​the output laser spot cannot be compressed to increase the power density of the output spot, and the laser output of the annular hollow spot cannot be realized; the right-angle The thermal stability of the conical prism cavity is low, and the prisms in some laser bands need to be manufactured with special optical crystals, which are expensive

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