Semiconductor internal-reflection-interference laser

Abstract

A semiconductor interferometric laser with built-in index guiding for lateral mode stability is reported. Interference is caused by internal reflection from a small notch in the waveguide channel. Very stable single longitudinal mode and stable lateral mode were observed. The intereference also causes wavelength locking over the ranges of more than 7 °C within which the wavelength changes at a moderate rate of about 0.6 Å/°C.