A Side Pump Combiner for High Power Fiber Laser Systems

Abstract

The present invention is applicable to the field of optical fiber devices, and provides a side-pump beam combiner for high-power optical fiber laser systems, including a signal optical fiber, the signal optical fiber includes a core and a cladding, and it is characterized in that the signal optical fiber The central tapering forms a tapered region, the tapered region includes a straight region and tapered regions located at both ends of the straight region, the cladding portion of the straight region is formed with a section of the first cladding corrosion region, the first A number of pumping optical fibers are bonded on the side wall end surface of the cladding corrosion zone through a refractive index matching adhesive liquid, and the straight zone located in front of the first cladding corrosion zone is a textured zone. The beam combiner recycles the pump light that is not coupled into the cladding, which improves the coupling efficiency and avoids heat accumulation and damage to the fiber; by tapering the signal fiber and then coupling the pump light to the side, it effectively filters out Some high-order modes reduce the stress sensitivity caused by high-order modes and optimize the beam quality.

Description

technical field [0001] The invention belongs to the field of optical fiber devices, in particular to a side-pump beam combiner used in a high-power optical fiber laser system. Background technique [0002] The fiber beam combiner is one of the core components of the fiber laser. The pump beam combiner is used to couple the pump light and the signal light into the active fiber to achieve laser amplification; the signal beam combiner is used to combine the laser beams to achieve Higher output power. There are mainly two types of fiber combiner implementation ideas: end-face coupling and side coupling. End-face coupling has high coupling efficiency by fusing the input fiber and output fiber end faces. It is the main method for making high-power beam combiners. However, end-face pumping also has disadvantages. On the one hand, because it involves end-face re-melting, it cannot Avoid introducing additional loss; on the other hand, because the size of the input fiber bundle shou...

AI Technical Summary

Problems solved by technology

For the side-pumping scheme, the softened pump fiber and the signal fiber are bonded at high temperature. Due to the extrusion between the fibers, external stress will inevitably be introduced, and the high-order modes in the large-mode-field fiber pair stress. Sensitive, so that parameters such as light field distribution and spot circularity are easily disturbed, so the light spot usually deteriorates after the beam passes through the side pump beam combiner

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