Patent ID: 6970486

Claim:
A mold type semiconductor laser comprising: a first lead having a die pad portion formed on one end; a laser chip and a light receiving element for monitoring an output of said laser chip, mounted on the die pad portion; second leads electrically connected to an electrode of said laser chip and an electrode of said light receiving element, respectively; a resin frame covering sides and a rear end face side of said die pad portion except for an emission surface side of said laser chip, and integrally holding one end portion sides of said first and second leads; and an antireflection means for preventing a light emitted from a rear end face of said laser chip from being reflected and incident on said light receiving element, said antireflection means being formed on a portion of said resin frame opposite to the rear end face of said laser chip with respect to said light receiving element, wherein said antireflection means is formed by removing a portion of said resin frame opposite to the rear end face of said laser chip, so that the light emitted from the rear end face of said laser chip passes through the removed portion and goes rearward, and a light reflected by said resin frame is not incident on said light receiving element, such that said antireflection means is configured to prevent interference between the light incident on said light receiving element directly from the rear end face of said laser chip and a light reflected on said light receiving element.