Patent ID: 7970041

Claim:
A semiconductor laser apparatus comprising: a first semiconductor substrate; an optical waveguide layer including an active layer formed on a part of a first surface of the first semiconductor substrate; a first reflective mirror provided at one end of the optical waveguide layer; a second reflective mirror which is a 45° mirror provided at the other end of the optical waveguide layer on an opposite side of the one end and inclined by 45° with respect to an extending direction of the optical waveguide layer; a first convex lens provided on a second surface of the first semiconductor substrate on a back side of the first surface so as to be on an optical axis of the second reflective mirror; an etalon provided above the second surface and including a first substrate and a second substrate having spacers disposed therebetween, the first substrate being of trapezoidal shape and having a first angled surface with a third reflective mirror disposed thereon, the second substrate being of trapezoidal shape, located above the first substrate, and having a second angled surface with a fourth reflective mirror disposed thereon, the first and second angled surfaces having opposing inclinations with respect to the first surface of the first semiconductor substrate, the spacers being disposed between the first angled surface of the first substrate and the second angled surface of the second substrate; and a fifth reflective mirror provided above the fourth reflective mirror of the etalon, wherein the fifth reflective mirror is provided orthogonally to an optical axis of light emitted from the first convex lens, and a laser cavity is constituted between the first reflective mirror and the fifth reflective mirror.