| 摘要 |
<p>A light source for an external cavity laser comprises a semiconductor laser 1 having a first facet to which is applied an antireflecti on coating 1A and a second facet to which is applied a increased reflection coating 1B defining a predetermined reflectivity, lenses 5, 6, a diffraction grating 2, and a mirror 3, wherein a light emitted from the first facet is converted into a parallel light by the lens 5, and the parallel light passes through the diffraction grating 2 to select a wavelength and is reflected to the diffraction grating 2 by the mirror 3 to select a wavelength via the diffraction grating 2 again, and the parallel light is converged by the lens 5 to be fed back to the semiconductor laser1, and a light emitted from the second facets is converged by the lens 7 to be output to an optical fiber 4. <IMAGE></p> |
