LONGITUDINAL MODE PERTURBATION OF LASER-DIODES WITH DRY-ETCHED TOTAL INTERNAL REFLECTOR

The spectral characteristics of rooftop reflector (RTR) laser diode an d serpentine shaped laser diode (SSLD) are presented. Lasers are fabri cated using two step Cl-2-based reactive ion beam etching (RIBE). It i s found that spectra of RTR laser and SSLD are very different from tho se of Fabry-Perot cavity lasers. Also Y-branch optical waveguide with total internal reflector (TIR) mirror was fabricated to measure backwa rd reflection from the TIR mirror. The results suggest that the spectr a of lasers with TIR mirrors have a strong longitudinal mode selectivi ty due to the scattering and reflection at TIR mirror.