Patent ID: 8483256

Claim:
A laser diode element assembly comprising: a laser diode element; and a light reflector, wherein the laser diode element includes (a) a laminate structure body configured by laminating, in order, a first compound semiconductor layer of a first conductivity type made of a GaN-based compound semiconductor, a third compound semiconductor layer made of a GaN-based compound semiconductor and including a light emission region, and a second compound semiconductor layer of a second conductivity type made of a GaN-based compound semiconductor, the second conductivity type being different from the first conductivity type, (b) a second electrode formed on the second compound semiconductor layer, and (c) a first electrode electrically connected to the first compound semiconductor layer, the laminate structure body includes a ridge stripe structure, laser light is emitted from a first end surface of the ridge stripe structure, and a part of the laser light is reflected by the light reflector to be returned to the laser diode element, and a remaining part of the laser light exits to outside through the light reflector, the laser light is reflected by a second end surface of the ridge stripe structure, and a minimum width W min and a maximum width W max of the ridge stripe structure satisfy 1<W max /W min <3.3 or 6≦W max /W min ≦13.3.