Lateral and longitudinal mode control in CdZnSe-based laser diodes

Abstract

Lateral patterning techniques have been applied to control the transversal and longitudinal mode structure in ZnSe-based laser diodes. For ridge wave-guide lasers with a stripe width L x of less than 5 μm, predominantly lateral single-mode emission was observed in the near-field and the far-field emission patterns. For the ratio of the vertical and the lateral far-field angle a factor of about 4.4 was obtained. Longitudinal mode control was realized using first-order distributed Bragg reflectors with periods between 95 and 102 nm for an emission in the blue and green spectral range. A side-mode suppression of up to 25 dB could be achieved.