Low threshold II-VI laser diodes with transversal and longitudinal single-mode emission

Room-temperature operation of laterally coupled distributed feedback laser diodes based on ZnSe compounds is presented. Longitudinal single-mode opera tion with a sidemode suppression of > 25 dB is obtained via a gain-coupling mechanism. Within one wafer, the emission energy can be changed over a ran ge of 36 meV in the green spectral range simply by varying the period of th e grating. Moreover, Gaussian-shaped near- and far-field patterns are obtai ned indicating device operation in the fundamental transversal mode. (C) 20 00 Elsevier Science B.V. All rights reserved.