High beam quality signal light fiber beam combiner and manufacture method thereof

Abstract

The invention provides a high beam quality signal light fiber beam combiner and a manufacture method thereof. The beam combiner comprises at least one signal optical fiber which forms one group and output optical fibers. The signal optical fiber comprises an optical fiber cladding and a fiber core, the fiber core comprises a fiber core body and a fiber core through connection portion, one end of the fiber core through connection portion is connected with one end of the fiber core body, and the cross sectional area of the fiber core through connection portion gradually increases from one end to the other end to enable the fiber core through connection portion to approximately be conical, the refractive index of the fiber core through connection portion gradually reduces from one end to the other end, and a V parameter is invariant. One ends of the output optical fibers are connected with the other end of the fiber core through connection portion of the group of the signal optical fiber. The high beam quality signal light fiber beam combiner adopts the fiber core through connection portion to enable the duty ratio of signal light at a welding position of a plurality of optical fibers and the output optical fibers to achieve 1, enables combined output laser angle relative packing ratio (angles of 1) to be greatly reduced, and effectively promotes output laser beam quality.

Description

technical field [0001] The invention relates to the technical field of lasers. A high beam quality signal optical fiber combiner and a manufacturing method of the high beam quality signal optical fiber combiner are specially designed. Background technique [0002] At present, IPG reports that the continuous output power of single-mode fiber laser has reached 10kW. However, limited by nonlinear effects such as stimulated Brillouin scattering and stimulated Raman scattering, as well as thermal effects and high power density damage to the fiber, it is extremely difficult to further increase the laser power of a single gain fiber. In order to obtain higher power fiber laser output, coherent combining and incoherent combining methods have been proposed successively. Coherent combining is to use a certain technology to lock the phases of several lasers with the same working wavelength, so that the lasers emitted by these lasers are superimposed in the far field. However, cohere...

AI Technical Summary

Problems solved by technology

Adaptive mirrors can transmit lasers from different paths to the same position to generate superposition of power, but require extremely high orientation accuracy, making it difficult to achieve

However, the fused tapered fiber coupler destroys the core structure of the signal fiber and deteriorates the quality of the laser beam after beam combining

For example, the Chinese patent, signal optical beam combiner and its manufacturing method (publication number CN101866032A), combines the butt ends of multiple input fibers into a bundle through high-temperature fusion tapering and fuses them with the butt ends of output fibers. The core diameter gradually decreases, resulting in a decrease in beam quality after combining

The patented optical fiber power combiner and its preparation method (publication number CN 102116902A) corrodes half of the inner cladding of the input n double-clad optical fibers, and then melts the taper, which can increase the duty cycle of the fiber core to 0.5, but It is impossible to achieve a duty ratio of 1, and the fiber core shrinks by using the fusion tapered method, which will also cause the beam quality to deteriorate after combining

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