REALIZATION OF OPTICALLY PUMPED 2ND-ORDER GAINN-DISTRIBUTED-FEEDBACK LASERS

Room temperature distributed-feedback (DFB) laser operation is demonst rated with emission wavelengths ranging from 389 to 399 nm. Second-ord er DFB gratings were defined by electron beam lithography and reactive ion etching in the top GaN barrier layer of a GaInN/GaN double hetero structure grown by metalorganic vapor phase epitaxy. Our data allow a precise determination of the effective refractive index n(eff)(lambda) over the whole emission range. n(eff)(lambda) is compared with previo usly published values for GaN and GaInN. (C) 1996 American Institute o f Physics.