Patent ID: 9620921
Date: 2017-04-11
CPC Classifications: B29C,B82Y,G03F,H01S

Claim:
1. A quantum cascade laser manufacturing method comprising: a first step of preparing a mother stamper with a predetermined first groove pattern formed on a surface of a substrate; a second step of pressing the mother stamper against a heated resin film having flexibility and maintaining pressure of the mother stamper while the resin film cures to transfer the first groove pattern to the resin film and making a resin stamper with a second groove pattern formed on the resin film, the second groove pattern having an inverted asperity of the first groove pattern; a third step of making a wafer, which includes a semiconductor substrate and an active layer formed on the substrate, the active layer having a cascade structure, the cascade structure including a plurality of quantum well light emitting layers and a plurality of injection layers, the plurality of quantum well light emitting layers and the plurality of injection layers being stacked alternately; a fourth step of forming an intermediate film on a surface on the active layer side of the wafer; a fifth step of forming a resist film on a surface of the intermediate film; a sixth step of pressing the resin stamper against the resist film by air pressure to transfer the second groove pattern to the resist film and forming on the resist film a third groove pattern having an inverted asperity of the second groove pattern, wherein the sixth step comprises: a seventh step of etching the intermediate film with the resist film serving as a mask; an eighth step of etching the wafer with the etched intermediate film in the seventh step serving as a mask to form a phase shifting diffraction grating on a surface of the wafer; and a ninth step of removing the etched intermediate film after the eighth step, wherein the intermediate film is a SiN film or a SiO