Laser light emitting device and method of manufacturing the same, and fiber laser apparatus using the same
AssigneeFujikura Ltd.
InventorShinichi Sakamoto
Life of this patent
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Abstract
The laser light emitting device includes a glass rod having an input end and an output end. The glass rod has a core provided along the central axis thereof and a cladding covering the core. The refractive index of the core on the side of the input end is higher than the refractive index of the cladding. A value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the output end is smaller than a value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the input end.
Claims12
A laser light emitting device, comprising:
- a glass rod including an input end and an output end, the glass rod having a core provided along a central axis thereof and a cladding covering the core, wherein
- the core and the cladding are adapted such that the core has a higher refractive index than the cladding on the side of the input end, and that
- a value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the output end is smaller than a value given through subtraction of the refractive index of the cladding from the refractive index of the core on the side of the input end.
A method of manufacturing a laser light emitting device, comprising:
- a preparation step of preparing a glass rod having an input end and an output end, a core, and a cladding covering the core, the core being doped with a dopant that has an action to cause the refractive index thereof to be higher than the refractive index of the cladding upon ultraviolet irradiation;
- and
- an ultraviolet irradiation step of applying a larger amount of ultraviolet light to the input end side than to the output end side, in such a manner that the refractive index of the core is set higher than the refractive index of the cladding at least on the input end side of the glass rod.
A method of manufacturing a laser light emitting device, comprising:
- a preparation step of preparing a glass rod having an input end and an output end, a core, and a cladding covering the core, the core having a higher refractive index than the cladding, the cladding being doped with a dopant that has an action to cause the refractive index thereof to be higher than the refractive index of the core upon ultraviolet irradiation;
- and
- an ultraviolet irradiation step of applying a larger amount of ultraviolet light to the output end side than to the input end side, within a range in which the refractive index of the core on the input end side remains higher than the refractive index of the cladding.
Dependencies are inferred from the claim text.