Patent ID: 7226222
Filing Date: 2007-06-05
Classification: G02B

Abstract:
1. A laser module comprising: one or more semiconductor laser elements which emit one or more divergent laser beams; one or more collimator lenses which collimate said one or more divergent laser beams to obtain one or more collimated laser beams; an optical condensing system which is constituted by one or more lenses, condenses said one or more collimated laser beams, and make the one or more collimated laser beams converge at a convergence position; an optical fiber which has a light-entrance end face and is arranged in such a manner that said convergence position is located on the light-entrance end face; a first package which contains said one or more semiconductor laser elements and said one or more collimator lenses, is hermetically sealed, and has a wall in which a window is formed so as to allow passage of said one or more collimated laser beams through the window, and a first cross section perpendicular to an optical axis of the optical fiber at the light-entrance end face; and a second package which is fixed to said wall, has a second cross section parallel to and smaller than said first cross section, contains at least a portion of said one or more lenses constituting said optical condensing system and a portion of said optical fiber containing said light-entrance end face, and is hermetically sealed; wherein said wall includes: