Patent ID: 9001859
Filing Date: 2015-04-07
Classification: H01S

Abstract:
1. A method for manufacturing a ridge semiconductor laser, comprising the steps of: stacking in the following sequential order of an AlGaInAs layer, an AlInAs layer, an AlGaInAs clad layer, a first InGaAsP layer, a first InP layer, and a second InGaAsP layer on one side of an AlGaInAs active layer; and etching the second InGaAsP layer and forming a diffraction grating, wherein in the stacking step, a temperature at which the first InGaAsP layer is stacked is made lower than a temperature at which the AlGaInAs clad layer is stacked, and wherein the temperature at which the first InGaAsP layer is stacked is lower, by X° C. (30≦X≦70), than the temperature at which the active layer is stacked.