Nitride laser diode with engineered non-uniform alloy composition in the n-cladding layer

摘要

An ultraviolet laser diode having multiple portions in the n-cladding layer is described herein. The laser diode comprises a p-cladding layer, an n-cladding layer, a waveguide, and a light-emitting region. The n-cladding layer includes at least a first portion and a second portion. The first portion maintains material quality of the laser diode, while the second portion pulls the optical mode from the p-cladding layer toward the active region. The first portion may have a higher aluminum composition than the second portion. The waveguide is coupled to the n-cladding layer and the light-emitting region is coupled to the waveguide. The light-emitting region is located between the n-cladding layer and the p-cladding layer. Other embodiments are also described.

主权项

1. A laser diode comprising:
a p-cladding layer; an n-cladding layer, the n-cladding layer comprising an engineered non-uniform alloy composition including a bottom portion and an upper portion,
wherein the bottom portion maintains material quality, wherein the bottom portion is substantially lattice matched to the substrate, andthe upper portion pulls a mode from the p-cladding layer, wherein the bottom portion and the upper portion are compressively strained layers; a waveguide coupled to the upper portion of the n-cladding layer; and a light-emitting region coupled to the waveguide, wherein the light-emitting region is located between the n-cladding layer and the p-cladding layer.