Patent ID: 6859474

Claim:
A light processing device comprising: (a) a substrate and (b) an active region, wherein said substrate comprises a semiconductor material having a lattice constant, and wherein said active region comprises a plurality of layers including: (i) at least one pseudomorphic light processing layer comprising In w Ga 1-w N x P y As z Sb 1-x-y-z (0≦w≦1, 0<x<0.1, 0≦y≦0.6, 0<z<1) and; at least one pseudomorphic barrier layer comprising Al q Ga 1-q N r P s As t Sb 1-r-s-t (0≦q≦1, 0≦r≦0.1, 0≦s≦1, 0<t<1) and wherein each of said plurality of layers in said active region has a composition different from the composition of any adjacent layer.