| 摘要 |
A laser assembly ( 10 ) comprises a multimode laser ( 12 ) having at least one output and operating at a given wavelength. It also includes a double-clad optical fiber ( 20 ) having a free end ( 22 ) coupled to the output of the laser ( 12 ). The optical fiber ( 20 ) comprises a core ( 24 ) in registry with the output of the laser ( 12 ), a multimode inner cladding ( 26 ) surrounding the core ( 24 ), and an outer cladding ( 28 ) surrounding the inner cladding ( 26 ), the outer cladding ( 28 ) being provided to contain light in the inner cladding ( 26 ). A fiber Bragg grating ( 30 ) is written in the core ( 24 ) of the fiber ( 20 ) at a given distance from the free end ( 22 ) thereof. The Bragg grating ( 30 ) has a reflection spectrum within the gain spectrum of the laser ( 12 ). In use, it generates a sufficient feedback and stabilizes the laser ( 12 ) at the reflection spectrum of the Bragg grating ( 30 ). This provides a low cost laser assembly that is simple, suitable for volume manufacturing and small in size. |
