Patent ID: 6822997
Filing Date: 2004-11-23
Classification: G02B,H01S,Y10S

Abstract:
A semiconductor laser module, comprisinga package that is filled with an inert gas and that is sealed airtightly, the package having a window; a semiconductor laser chip outputting light; a lens disposed at the inside of the package that is optically designed such that it condenses light that is output from the semiconductor laser chip and couples the condensed light into an optical transmission path outside the window of the package; an optical isolator that is disposed between the lens and the window at the inside of the package; a temperature control mechanism for keeping temperature of the semiconductor chip, the lens and the optical isolator constant; and a tubular ferrule that holds and covers the optical transmission path; the semiconductor laser chip, the lens, the optical isolator, and the temperature control mechanism being arranged inside the package; wherein an external optical isolator is arranged at an end face of the ferrule on the side of the package at the outside of the package.