Single longitudinal mode operation of cw junction lasers by frequencyhyphen;selective optical feedback

摘要

cw oscillation in a single longitudinal mode is reported for stripehyphen;geometry junction lasers operated at room temperature with frequencyhyphen;selective optical feedback. The frequencyhyphen;selective feedback, obtained by optically coupling a diffraction grating to the diode, is used to select a single mode of the normally multimode spectrum generated by the diode laser itself. Singlehyphen;frequency oscillation is observed for currents up to 30percnt; above threshold. The oscillation frequency has a linewidth determined primarily by the internal dynamics of the diode and is tunable over the entire multimode spectrum. Additional experimental results demonstrate the homogeneous broadening of the radiative line in these lasers.