Patent ID: 8617912
Filing Date: 2013-12-31
Classification: B82Y,G03F,H01S

Abstract:
1. A method for manufacturing a semiconductor laser, the method comprising the steps of: preparing a mold having a pattern surface on which a pattern including a plurality of recesses is formed; forming a stacked semiconductor layer on a principal surface of a substrate, the stacked semiconductor layer including an active layer and a grating layer; forming a resin part on the grating layer; forming a resin pattern portion having recesses on the resin part by transferring the pattern formed on the pattern surface of the mold onto the resin part by a nano-imprint technique using the mold; forming a diffraction grating in the grating layer by etching the grating layer using the resin part on which the resin pattern portion is formed as a mask; and forming a mesa-structure on the stacked semiconductor layer by etching the stacked semiconductor layer, wherein the recesses in the mold extend in a first direction that is parallel to the pattern surface and are periodically arranged in a second direction that is orthogonal to the first direction, each of the recesses in the mold including two end portions in the first direction and a middle portion between the two end portions, a depth of at least one of the two end portions from the pattern surface being greater than a depth of the middle portion from the pattern surface, wherein, in the step of forming the resin pattern portion, the recesses formed in the resin part are periodically arranged in a third direction that is parallel to the principal surface of the substrate, wherein, in the step of forming the diffraction grating, the diffraction grating has two end portions in a direction orthogonal to the third direction corresponding to the pattern formed on the pattern surface of the mold, and wherein the step of forming the mesa-structure includes the steps of: