Semiconductor laser module and positioning method thereof
AssigneeFujitsu Limited
InventorsSaburo Uno, Takayuki Masuko, Kaoru Moriya, Masayuki Siga
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Abstract
A semiconductor laser module comprises a semiconductor laser chip for emitting a laser beam, a collimator lens for collimating the laser beam to a collimated beam, a focussing lens for focussing the collimated beam, and an optical fiber having an inclined input face to which the laser beam from the focussing lens in input. The focussing lens is arranged in such a manner that the optical axis of the collimated beam incident on the focussing lens is deviated from a center axis of the focussing lens, and the optical fiber is arranged in parallel to the collimated beam in such a manner that the laser beam is incident on an optical axis of the optical fiber.
Claims17
A semiconductor laser module, comprising:
- a semiconductor laser chip for emitting a laser beam;
- a collimator lens for collimating said laser beam to a collimated beam;
- a focussing lens having a center axis for focussing said collimated beam, said focussing lens comprising a first lens having a center axis and a second lens having a center axis;
- an optical fiber having an optical axis and an inclined input end face to which said laser beam from said focussing lens is input;
- said focussing lens is arranged in such a manner that said collimated beam incident on said focussing lens has an optical axis deviated from said center axis of said focussing lens;
- said collimated beam from said collimator lens is incident on said first lens in such a manner that an optical axis of the laser beam emitted therefrom is parallel to said center axis of the first lens;
- and
- said laser beam incident on said second lens is refracted therein and said optical fiber is arranged parallel to said collimated beam in such a manner that said laser beam output from said second lens is incident on said optical axis thereof.
A semiconductor laser module, comprising:
- a semiconductor laser chip for emitting a laser beam;
- a collimator lens for collimating said laser beam to a parallel beam;
- an optical isolator;
- a front half of a divided Grin rod lens;
- a rear half of said divided Grin rod lens;
- an optical fiber having an optical axis and an inclined input end face;
- a laser side assembly for combining, in position, said semiconductor laser chip, said collimator lens, and said front half of the divided Grin rod lens;
- an intermediate lens assembly comprising means for fixedly holding said front half of the divided Grin rod lens;
- a fiber side assembly comprising an inner cylinder for fixedly holding said optical fiber, an outer cylinder into which said inner cylinder is inserted adjustably in the axis direction, and a cylindrical lens holder for fixedly holding said rear half of the divided Grin rod lens;
- said cylindrical holder being mounted on said inner cylinder as to be radially adjustable with respect to said optical axis of said optical fiber;
- and
- said laser side assembly being fixed to said intermediate lens assembly and, in turn, said intermediate lens assembly being fixed to said fiber side assembly.
Dependencies are inferred from the claim text.