Optical coupling system for large power laser diode array

Abstract

An optical coupling system for a high-power laser diode array, including micro-cylindrical lenses sequentially arranged along the forward direction of the light beam emitted by the high-power laser diode array, a Bechan prism micro-chip shaper, a first cylindrical lens and a second Cylindrical lens, characterized in that the Beham prism micro-chip shaper is a Beham prism micro-chip shaper composed of closely arranged Beham prism sheets, and the optical axis of each Beham prism is consistent with the direction of light beam advancement and revolves around the The optical axis is rotated by 45°, and the focal points of the first cylindrical lens and the second cylindrical lens coincide. The invention can be used to couple the laser light emitted by the high-power laser diode array into the energy transmission fiber, and can also be used for the pumping coupling of the solid-state laser. The invention has the advantages of simple processing and assembly, no change of beam propagation direction and high coupling efficiency.

Description

technical field [0001] The invention relates to a set of optical coupling system capable of splitting, rotating and shaping the beam emitted by a high-power laser diode array, which can couple the laser emitted by the high-power laser diode array into an optical fiber, and can also be used as a pump for a solid-state laser coupling system. Background technique [0002] The light-emitting surface of the laser diode array is mostly a rectangle of 1×100 μm to 1×400 μm, and the emitted laser beam has different divergence angles in two directions: along the length direction is the slow axis, and the divergence angle is usually 10 degrees; The direction parallel to 1 micron is called the fast axis, and the divergence angle is usually 38 degrees. A high-power laser diode array is formed by discontinuously arranging several such light-emitting areas in a linear shape, usually reaching 1 cm in the length direction. It is not difficult to calculate that the Lagrangian invariants of ...

AI Technical Summary

Problems solved by technology

The shaper has the characteristics of simple structure, easy processing, and low cost. The disadvantage is that when the Dove prism rotates non-parallel light, it will introduce serious astigmatism. Every last beam of light will produce astigmatism, which will seriously affect the size and depth of focus of the focused spot and reduce the coupling efficiency

Therefore, the coupling system using this invention can only couple 60% of the energy of the laser beam emitted by the 1 cm long high-power laser diode into the optical fiber with a core diameter of 0.6 mm and a numerical aperture of 0.22

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