| CPC H01S 3/0912 (2013.01) [G01J 1/4257 (2013.01); H01S 3/094053 (2013.01)] | 18 Claims |
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1. A laser device comprising:
a first light source;
a delivery fiber that propagates, in a propagation direction of the delivery fiber, laser light emitted from the first light source;
a monitor fiber that:
is optically coupled to the delivery fiber, and
propagates a first light that does not propagate in the propagation direction in the delivery fiber, wherein the first light is in a wavelength band of visible light emitted by a fiber fuse, and is part of light propagating in a direction opposite to the propagation direction of the laser light in the delivery fiber;
a light receiver that receives the first light propagated by the monitor fiber and detects the first light;
an input fiber bundle comprising input fibers optically coupled to a plurality of light sources including the first light source; and
a bridge fiber comprising an incident end face and a propagating end face, wherein
the light receiver comprises:
a near-infrared light reflection type mirror that has:
a lower reflectance of the first light than a second light in a wavelength band of near-infrared light, and
a higher transmittance of the first light than the second light; and
a photoelectric converter on which light transmitted through the near-infrared light reflection type mirror is incident,
the input fiber bundle is connected to the incident end face in the bridge fiber,
a first end face of the monitor fiber is connected to the incident end face of the bridge fiber, and
a first end face of the delivery fiber is connected to the propagating end face of the bridge fiber.
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