Off-axis spectrum beam combination device of laser diode array

Abstract

The invention relates to an off-axis spectrum beam combination device of a laser diode array, which comprises a laser diode array and a fast axis collimation lens, wherein the rear side of the fast axis collimation lens is provided with a first lens, a second lens and a high-reflection mirror are sequentially arranged above the rear of the first lens, and rear end faces of the high-reflection mirror and the second lens as well as the first lens and the diode array form an off-axis outer feedback cavity; a diffraction grating is arranged below the rear of the first lens, an output coupling mirror is arranged between the diffraction grating and the first lens, a spectrum beam combination structure is formed among the output coupling mirror and the diffraction grating as well as the first lens; and light rays emitted upwards by the laser diode array are subjected to divergence-angle compression through the first lens and the second lens and then projected on the high-reflection mirror, light rays parallel to the high-reflection mirror are reflected to the fast axis collimation lens, light rays emitted downwards by the laser diode array irradiate to the diffraction grating through the lower part of the first lens, and are processed through the output coupling mirror after being diffracted by the diffraction grating, part of the light rays are fed back to an active region of the diode array along the original path, and part of the light rays are output used as laser. The off-axis spectrum beam combination device has a simple and compact structure, can improve the beam quality of the two-dimensional laser diode array and is safe and reliable.

Description

technical field [0001] The invention relates to a spectrum beam combining device, in particular to an off-axis spectrum beam combining device of a laser diode array. Background technique [0002] High-power laser diode arrays have the advantages of high efficiency, compact structure, and long service life, so they have been widely used in many fields, such as industry, military, and medical fields (Opt. Express 12, 609). However, the beam quality in the direction of the slow axis of the diode array is relatively poor, about 1000 times the diffraction limit (Opt. Lett. 21, 375-377). This restricts the application of high-power laser diode arrays in many fields, such as pumping solid-state or fiber lasers. Spectral beam combination technology (Opt. Lett. 30, 2104-2106; Appl.Phys.B 83 225-228) is also a very effective method to improve the beam quality of diode arrays; its core idea is to sacrifice the width of the spectrum to Improve beam quality. Another method to improve ...

AI Technical Summary

Problems solved by technology

At present, the off-axis spectral beam assembly device is mainly used to improve the beam quality of the one-dimensional laser array, and the output laser power of the one-dimensional laser diode array is relatively low, which limits the application in actual production

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