Patent ID: 8228967
Filing Date: 2012-07-24
Classification: H01S

Abstract:
1. A light emitting device comprising: a first cladding layer; an active layer formed above the first cladding layer; and a second cladding layer formed above the active layer, wherein the active layer includes a first side surface and a second side surface parallel to the first side surface, at least a part of the active layer configures a first gain region and a second gain region, the first gain region has a first end surface on the second side surface and a third end surface on the first side surface, and the second gain region has a second end surface on the second side surface and a fourth end surface on the first side surface, a second reflectance of the second side surface is higher than a first reflectance of the first side surface at a wavelength range of light generated in the first gain region and the second gain region, a part of the first end surface of the first gain region overlaps with the second end surface of the second gain region to configure an overlapping plane, a first center line connecting a first center of the first end surface and a third center of the third end surface is angled relative to a perpendicular direction relative to the first side surface, a second center line connecting a second center of the second end surface and a fourth center of the fourth end surface is angled relative to the perpendicular direction, and the first center line and the second center line intersect at an intersection point, the overlapping plane is shifted from the intersection point in a shift direction from the second side surface toward the first side surface in a plan view, a width W of the first gain region in the vicinity of the overlapping plane and the width W of the second gain region in the vicinity of the overlapping plane are equal to each other, and when a length between the intersection point and the overlapping plane is L, the width W and the length L satisfy the following formula 1;