Optical coupling system for large power laser diode array

Abstract

The invention discloses an optical coupling system for large-power laser diode array, which comprises the following parts along luminous beam advancing direction from the large-power laser diode array: microcylinder lens, Bieham prism micropiece shaper, first column lens and second column lens, wherein the Bieham prism micropiece shaper is composed of tightly arranged Bieham prism slices with each optical axle of Bieham prism in consistency with the luminous beam advancing direction, which is rotated by 45 deg around optical axle; the focus of the first and second column lens coincide mutually. The invention can couple the laser of the large-power laser diode array into energy transmitting optical fiber and couple pump of solid laser, which is simple to manufacture and assemble with high coupling efficiency without changing the transmitting direction of luminous beam.

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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