A Laser Array Coupling System with Beam Correction

Abstract

The invention discloses a laser array coupling system with beam correction, comprising: a laser light source for emitting a laser beam array; a fast axis adjustment unit, the fast axis adjustment unit is used to reduce the distance between adjacent laser beams in the fast axis direction ; Beam correction compound prism, including two obtuse-angled triangular prisms with the same structure and symmetrically arranged, used to increase the width of the laser beam in the direction of the slow axis and reduce the distance between adjacent laser beams in the direction of the slow axis; Converging unit and single core The optical fiber, the converging unit is used for coupling the laser beams exiting from the rear refracting surfaces of the two obtuse-angled triangular prisms to the single-core optical fiber. The invention can increase the width of the laser beam in the direction of the slow axis, and simultaneously reduce the spacing of the laser beam in the direction of the fast axis and the slow axis, the laser beam emitted from the beam compound correction prism is compactly arranged, the residual divergence angle is eliminated, and the convergence The resulting smaller spot size allows coupling into smaller diameter single-core fibers. The invention has compact structure and high integration.

Description

technical field [0001] The invention relates to the technical field of semiconductor laser light sources, in particular to a laser array coupling system with beam correction. Background technique [0002] The output beam of the laser diode has an elliptical energy distribution and has astigmatism. Generally, after the vertical direction is collimated, there is still a residual divergence angle in the horizontal direction. It makes it difficult for the coupled light spot to enter the thinner fiber, which affects the coupling efficiency and the optical power output by the fiber. [0003] In order to improve the output optical power, it is generally necessary to use multiple laser diodes for fiber coupling. Due to the limitation of physical size and installation size, the output beams of laser diodes are spaced apart from each other, while the converging lens has physical aperture limitations, which affects the number of received beams and the spot size. Size is limited. Also...

AI Technical Summary

Problems solved by technology

[0004] The prior art provides a technical solution in which TO-Can packaged semiconductor lasers are installed in both horizontal and vertical directions. The emitted light is not beam corrected, and there is a significant residual divergence angle, resulting in an excessively large spot size when coupled into the fiber, making it difficult to fully couple into a thinner fiber (such as a 100um core)

[0005] The prior art also provides a technical solution in which multiple TO-Can packaged semiconductor lasers are fixed on the heat sink in a ring arrangement. This arrangement causes the output beams to fail to fill the central part of the ring, and the central part is not fully utilized. , resulting in a waste of space

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