Laser pumping device

Abstract

The invention discloses a laser pumping device. After being transmitted by a transmission module, pump light generated by a pump light source is divided into two paths of pump light with orthometric polarization directions by a polarization separation module, annular light beams obtained after one path of pump light is processed by a light beam transformation module and the other path of pump light undergo spatial beam combination in a light beam combination module, the combined light beam is input into a convergence module, and the convergence module gathers the pump light after the beam combination into laser crystals. The laser pumping device is applied to an end face pump solid laser which performs light guide transmission on the pump light source and takes the crystals of the linear polarization absorption characteristic as laser working material, can turn a naturally polarized beam into a linearly polarized beam, promotes power injection and homogenization of the laser crystals of the linear polarization absorption characteristic onto the pump light under the condition that the power and space distribution uniformity of the pump light is kept to the maximum through polarization separation, polarization direction adjustment and beam combination, and thus greatly optimizes the design of the laser.

Description

technical field [0001] The invention relates to the technical field of solid-state lasers, in particular to a laser pumping device. Background technique [0002] There are many types of lasers, and among the pumping methods used by laser diodes as the pumping source of lasers, the end pumping method has the advantages of simple pumping structure, high coupling efficiency, good matching between pumping beam and cavity mode, and easy Obtaining the advantages of better beam quality and low threshold has become a more commonly used pumping method in the field of laser technology. In 1982, K.Kubodera and J.Noda introduced a fiber-coupled laser diode end-pumped solid-state laser on Applied Optics No. 21. Each light source is equipped with a corresponding focusing lens and an optical fiber for transmission. A fiber output end is also equipped with a lens to focus the pump light, and these units are arranged in a cone to pump into a rod-shaped laser crystal at an angle. This struc...

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Problems solved by technology

[0004] A pumping structure is also introduced in the prior art. The pumping light output by the light guide divides the polarizing beam splitter into two beams of linearly polarized light, and the polarization direction of one of the beams is adjusted by 90°, and then converged into the laser crystal from both ends for further processing. Pumping, although this improves the absorption efficiency of the laser crystal to the pump light, the power injected into one end face of the laser crystal is only a part of the total power of the pump light source, which reduces the injection of pump light into one end face of the laser crystal; Although the two separate beams of light are also adjusted backwards and paralleled into a lens for convergence, the total power injected at one end face is not reduced, but the distribution of the pump light in the laser crystal does not match the laser mode well. Can not reach the ideal state of laser design

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