Wavelength-combined laser device

A laser and laser technology, applied in the direction of lasers, laser components, semiconductor lasers, etc., can solve problems such as crosstalk, beam quality and photoelectric conversion efficiency reduction, and achieve high beam quality and high photoelectric conversion efficiency.
CN110383607AActive Publication Date: 2019-10-25MITSUBISHI ELECTRIC CORP
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
MITSUBISHI ELECTRIC CORP
Publication Date
2019-10-25

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Abstract

A wavelength-combined laser device (10) is provided with: a semiconductor laser which emits, from emitting end surfaces (1b) of a plurality of light-emitting parts arranged in the laser beam combination direction, a plurality of laser beams (6) in the optical axis direction perpendicular to the laser beam combination direction; a wavelength combining element (3) which combines the plurality of laser beams in the laser beam combination direction and emits the combined laser beams as a single laser beam; a cross-coupling suppression optical system (4) which has positive power in the laser beam combination direction perpendicular to the optical axis of the single laser beam output from the wavelength combining element; and a partial reflecting mirror (5) which reflects the single laser beam that has passed through the cross-coupling suppression optical system and transmits and outputs the laser beam, wherein, in the plane formed by the optical axis and the laser beam combination direction, the cross-coupling suppression optical system is disposed so that images of the emitting end surfaces are formed on the partial reflective mirror by connecting, in a conjugate manner, the emitting end surfaces and the partial reflective mirror.
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Description

technical field

[0001] The present invention relates to a wavelength-coupled laser device that combines laser light emitted from a plurality of light emitting parts of a semiconductor laser. Background technique

[0002] As an example of a laser oscillator that combines light emitted from many semiconductor laser diodes (Laser Diode: LD) (hereinafter referred to as LD light), there is a wavelength coupling type resonator using a diffraction grating as a wavelength coupling element.

[0003] In recent years, in processes such as cutting and welding of metals, LD light having a wavelength of 900 nm or 1000 nm and having a high photoelectric conversion efficiency has been directly used. However, in these applications, the focal power of a single LD light, i.e., the light emitted from one light emitting layer of a semiconductor element, that is, the active layer stripe, is limited. Therefore, in order to obtain laser light with high power, light from a plurality of light emittin...

Claims

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