Combined holophote laser resonant cavity composed of right-angle round platform inboard surface and right-angle taper outboard surface

Abstract

The disclosed total-reflection laser cavity comprises a total-reflection mirror composed by a right-angle rotary table medial surface and a coaxial right-angle conical lateral surface both as high reflecting surfaces, an output mirror, and the laser active medium. Wherein, there is a size relation PHIb=2PHIa with PHIa as the diameter of contact circle between the lateral and medial surfaces, and PHIb as the bottom diameter of the total-reflector. This invention has well performance and wide application.

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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