Optical fiber laser group beam laser

Abstract

A optical fiber beam laser includes multiple double clad optical fibers, one end of each optical fiber is connected with a pump laser, the other ends of the optical fibers are closely arrayed in a optical fiber clamp in linearity to form a flat optical fiber array output end face and put in an end of a resonator box after removing the clad, a flat convex lens is set at the other end of the box coated with antireflection film on the convex face and the plane face is coated with semi-transparent reflection film toward outside of the box, the distance of the optical fiber array output end face to the semi-transparent reflection film is D, the distance between the fiber cores is d, focal distance of the lens is F forming the following formula: sqd(lambda / 2) F and D=F / 2.

Description

technical field [0001] The invention relates to a fiber laser, in particular to a fiber laser group laser. Background technique [0002] Among various techniques for coherent combination of laser beams, coherent beam combination using an external cavity is a very useful technique. In the prior art, the designed external cavity has a spatial filter, which requires two lenses and a separate semi-transparent mirror, see the prior art [IEEE J.QuantumElectron.Vol.27:1582-1593, 1991], this This kind of external cavity can coherently couple the output laser light of the fiber array, but the optical path is complicated, the distance between all optical components needs to be strictly controlled, the stability of the whole system is not high, and it is difficult to realize. In addition, because the beam is in the resonator When going back and forth, passing through the surface of each component multiple times, the loss of light energy is relatively large, which is not conducive to t...

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Problems solved by technology

In the prior art, the designed external cavity has a spatial filter, which requires two lenses and a separate semi-transparent mirror, see the prior art [IEEE J.QuantumElectron.Vol.27:1582-1593, 1991], this This kind of external cavity can coherently couple the output laser light of the fiber array, but the optical path is complicated, the distance between all optical components needs to be strictly controlled, the stability of the whole system is not high, and it is difficult to realize. In addition, because the beam is in the resonator When going back and forth, passing through the surface of each component multiple times, the loss of light energy is relatively large, which is not conducive to the improvement of the power of the entire system

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