Light emitting device

A light emitting device comprising:

• an active layer forming a gain region that generates light;
• a first cladding layer and a second cladding layer that sandwich the active layer and confine the light in the active layer;
• and
• a first reflective part and a second reflective part reflecting the light generated by the gain region;
• wherein
• the gain region is continuous from a first end surface provided to a first side surface of the active layer to a second end surface provided to the first side surface;
• the gain region includes:
• a first portion extending from the first end surface to the first reflective part in a direction tilted with respect to a normal to the first side surface as viewed from a stacking direction of the first cladding layer, the active layer, and the second cladding layer;
• a second portion extending from the second end surface to the second reflective part in a direction tilted with respect to a normal to the first side surface as viewed from the stacking direction;
• and
• a third portion extending from the first reflective part to the second reflective part in a direction tilted with respect to a normal to a first interface between the first reflective part and the gain region as viewed from the stacking direction;
• and
• the light generated by the gain region is emitted from the first end surface and the second end surface.