Laser device

Abstract

A laser device comprises: at least one light source; a delivery fiber that propagates laser light emitted from the light source; and a first light detection unit and a second light detection unit that are capable of detecting a portion of light propagating in the delivery fiber in a direction opposite to the propagating direction of the laser light. The first light detection unit detects first light included in the wavelength band of visible light, and the second light detection unit detects second light included in the wavelength band of near-infrared light.

Description

technical field [0001] The present invention relates to laser devices. [0002] This application claims priority based on Japanese Patent Application No. 2019-034377 filed in Japan on February 27, 2019, the contents of which are incorporated herein. Background technique [0003] A fiber laser device used as a laser processing machine for cutting or welding metal plates propagates laser light in a transmission fiber and emits it to the outside. In this fiber laser device, reflected light reflected from a workpiece returns toward the fiber laser device, and optical components such as an optical fiber and a laser diode (LD) may be damaged due to accidental heating or the like. Therefore, it is necessary to accurately detect the amount of reflected light and provide feedback to the control of laser output. [0004] In this regard, Patent Document 1 discloses a technique of monitoring both the reflected light propagating through the core and the reflected light propagating thro...

AI Technical Summary

Problems solved by technology

Visible light emitted from the core heated to a high temperature and propagating toward the light source when fiber fusing occurs has a different wavelength band and power from the reflected light reflected from the workpiece, so it is difficult to pass the detection for detecting reflected light. device to correctly detect the

Therefore, in the laser device described in Patent Document 1, the return light cannot be accurately detected, and it is difficult to sufficiently protect the optical components.

Images