Semiconductor laser side pump module

Abstract

The invention relates to a semiconductor laser side pump module comprising one or more side pump module units and a crystal bar, wherein each side pump module unit comprises a baseplate, a semiconductor laser module fixed on the baseplate, a fast axis collimator arranged at the front end of the semiconductor laser module and a beam expander arranged behind the fast axis collimator, and the crystal bar is arranged behind the beam expander; the semiconductor laser module comprises a bar; and the side pump module unit also comprises a homogenizing mirror arranged between the beam expander and the crystal bar. The side pump module can ensure that the beam homogeneity and the energy density of a pumping semiconductor laser satisfy the operating requirement by utilizing fewer high-power semiconductor laser arrays as the pumping source after beam expansion and homogenization.

Description

technical field [0001] The invention belongs to the field of lasers, and relates to a semiconductor laser, in particular to a semiconductor laser side pump module. Background technique [0002] As all-solid-state lasers show more and more broad application prospects in industrial, medical, military and other fields, higher requirements are put forward for the semiconductor laser side pump module as the core component. At present, side-pump modules at home and abroad usually use semiconductor laser horizontal arrays to form regular triangles, regular pentagons, regular heptagons, etc. to distribute the crystal rods in the pump center. In order to meet the requirements of crystal rods for pumping size, power density and other parameters, semiconductor laser arrays often adopt traditional horizontal array forms such as 1×3, 1×4, 1×N (Burbgan R, SPIE, 1994, 2206: 256; Lu Baida, Shao Huaizong, Infrared and Laser Engineering, 1997, 26(6): 29). Since multiple bars are arranged in...

AI Technical Summary

Problems solved by technology

[0004] 1) high cost

The traditional side-pump technology requires multiple low-power semiconductor laser bars to be arranged linearly to meet the pump power requirements, which leads to high cost of the pump source

[0005] 2) Complicated assembly

And the long-time work of the system will lead to a decrease in the consistency of the arrangement of the semiconductor laser bars, resulting in a decrease in pumping efficiency

[0006] 3) Poor reliability

The traditional side-pump technology uses multiple low-power semiconductor laser bars connected in series, so the waterway system of the required water-cooling module is complicated, and water leakage is prone to occur, causing damage to the entire pump module

In addition, in order to meet the requirements of beam uniformity, in the traditional pumping technology, there is only a gap of about 0.5mm between the semiconductor laser bars, which is not easy to install and brings difficulties to the circuit connection, thus greatly reducing the reliability of the system

[0007] 4) Uneven side pump energy

The traditional side-pump technology mainly compresses the light beam in the fast axis direction of the semiconductor laser pump source, and does not process the slow axis direction, so the energy distribution of the side pump beam is uneven, resulting in uneven heating of the crystal rod and thermal effects, which will cause the entire module The conversion efficiency drops

Images