REALIZATION AND CHARACTERIZATION OF OPTICALLY PUMPED GAINN-GAN DFB LASERS

Room-temperature (RT) operation of optically pumped GaN-GaInN distribu ted-feedback (DFB) lasers is demonstrated in the spectral range from 4 00 to 415 nm, The ridge-waveguide distributed feedback lasers were rea lized by dry etching on a GaN-GaInN double heterostructure, Laser emis sion was observed in the entire spectral range of optical gain, which was determined by amplified spontaneous emission (ASE) measurements, T he wavelength shift of the distributed Feedback laser emission with te mperature was investigated, An array of DFB lasers with different grat ing periods allowed to obtain the spectral dependence of the laser thr eshold and the effective refractive index of the GaN-GaInN lasers, The lowest laser threshold we achieved was 0.95 MW/cm(2).