Patent ID: 8956902
Filing Date: 2015-02-17
Classification: B82Y,H01S

Abstract:
1. A process for manufacturing buried hetero-structure laser diodes, said process comprising the steps of: forming a stacked semiconductor layer including an active layer on a principal surface of a substrate; forming a stripe-shaped mask layer on the stacked semiconductor layer, the mask layer extending along a first direction; forming a semiconductor mesa extending along the first direction by dry etching the stacked semiconductor layer through the stripe-shaped mask layer; after forming the semiconductor mesa, selectively wet etching the stacked semiconductor layer of the semiconductor mesa through the stripe-shaped mask layer to form an overhang of the semiconductor mesa under the mask layer and a space region under the overhang; selectively growing a buried layer in the space region on a side surface of the semiconductor mesa and on the substrate while leaving the mask layer on the semiconductor mesa, the buried layer having a first side surface adjacent to the side surface of the semiconductor mesa in a second direction perpendicular to the first direction; forming a lateral portion of the buried layer and a bottom portion of the buried layer that covers the substrate by etching the buried layer to the middle thereof by using the stripe-shaped mask layer on the semiconductor mesa to form a second side surface of the buried layer in the second direction; after forming the lateral portion of the buried layer, removing the mask layer on the semiconductor mesa; and forming an electrode on a top surface of the semiconductor mesa, the side surface of the lateral portion of the buried layer, and on the bottom portion of the buried layer so that the electrode is formed on the buried layer with the buried layer between the electrode and the substrate.