Laser composite wave appts.

Abstract

The object of the present invention is to provide a compact and high output laser light coupler device. The solutions includes that each laser light beam La, Lb, Lc is emitted by a plurality of semiconductor laser 11A, 11B, 11C, passes a convergence lens 120, and is converged in the FAST axis. And light axis of each light beam La, Lb, Lc installs a convergence angle varying optical system 30 which is more upstream than the most upstream position Pa which is crossed position, looked in the FAST axis. The convergence angle varying optical system 30 makes convergence angle of the whole light beam which is made of each light beam La, Lb, Lc and which passes through a convergence-divergence optical system 120, become smaller convergence angle in the FAST axis, and makes the whole light beam emit into the core 41 of optical fiber 40.

Description

technical field [0001] The present invention relates to a laser multiplexing device, and more specifically, to a laser multiplexing device for converging all beams composed of laser beams emitted from a plurality of semiconductor lasers and incident on an optical fiber. Background technique [0002] Conventionally, each beam of laser light emitted by a plurality of semiconductor lasers arranged in one direction is passed through a collimator lens to become a parallel beam with mutually parallel optical axes arranged in one direction, so that the beams arranged side by side A method is well known in which all the light is collected, incident on a single optical fiber, and laser light having a high energy density is transmitted through the optical fiber (for example, Patent Document 1). [0003] In the above-mentioned method, the efficiency (coupling efficiency) when each beam of laser light emitted from a plurality of semiconductor lasers is combined into one optical fiber is...

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Problems solved by technology

[0020] As mentioned above, while the position of the redirecting system is fixed at a very small area where multiple beam waists are concentrated with high precision, it is necessary to make the redirecting system itself consistent with the shape of each beam at the above-mentioned focusing position, and to carry out a compact operation. Moreover, it is produced with high precision, and the manufacture of the redirection system is difficult

In addition, since the size of the beam waist is proportional to the wavelength, in recent years, with the shortening of the wavelength of the laser light source, the above-mentioned size has been reduced, and the high-precision fixing and miniaturization of the redirection system are more required, and the manufacturing difficulty is becoming more and more difficult.

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