Active lock phase multi-fiber laser without external phase-adjusting part and interference bundle method

Abstract

The present invention relates to an active phase locking multi-optical fiber laser with no external phase modulation device and a coherent beam combination method. Two ends of an active optical fiberare written into a grating; the optical fiber with the maximum gain is used as a main resonant cavity for manufacturing optical fiber lasers; a plurality of active optical fibers with similar length are taken for manufacturing optical fiber lasers. Coating and outer cladding layers at two end parts of the optical fiber of each optical fiber laser are removed, and then a common outer cladding layeris arranged on the place where the outer cladding layers are removed. By utilizing synergistic coupling, the rest active optical fiber lasers are phase-locked on the laser of the main resonant cavitywithout adding any external phase modulation device, which simplifies the complex feedback control system of the prior active phase locking optical fiber laser. According to needs, the number of theoptical fiber lasers can be arbitrarily increased or decreased, so as to increase or decrease beam combination power. In an uncoupling area, the placement of the optical fibers can be arbitrarily arranged. The beam combination method can arbitrarily combine needed optical fiber lasers, can adopt discrete or united pumps, and is easy in heat dissipation and low in requirements on active optical fibers. The active phase locking multi-optical fiber laser is characterized in little influence from environment, compact structure, easy implementation, etc.

Description

Technical field: [0001] The invention relates to an active phase-locked multi-fiber laser without an external phase-modulating device and a coherent beam combining method. It is a high-power double-clad fiber laser, especially an active phase-locked multi-fiber laser laser coherent beam combining method. Laser beam assembly and optoelectronic devices. Background technique: [0002] The field of rare earth-doped optical fiber is a new branch of current optics. The gain characteristics of rare earth ions combined with the advantages of optical fiber have developed many compact and high-efficiency devices, especially rare earth-doped fiber lasers have achieved unprecedented rapid development. Ytterbium-doped cladding-pumped fiber lasers can achieve high-power and high-beam-quality laser output, and are currently a hot spot in international research. [0003] High-power fiber lasers organically combine semiconductor laser pumping technology and double-clad fiber doping manufact...

AI Technical Summary

Problems solved by technology

The more fiber bundles, the more couplers are needed, the greater the insertion loss introduced, which reduces the efficiency, and the couplers have a certain laser damage threshold, it is difficult to achieve high power, and the structure is complicated, so this bundle Method is not an option for coherent beam combining of ultra-high power fiber lasers

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