Single longitudinal mode operation of cw junction lasers by frequency-selective optical feedback
Abstract
cw oscillation in a single longitudinal mode is reported for stripe-geometry junction lasers operated at room temperature with frequency-selective optical feedback. The frequency-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. Single-frequency oscillation is observed for currents up to 30% 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.
- Publication:
-
Applied Physics Letters
- Pub Date:
- December 1974
- DOI:
- 10.1063/1.1655385
- Bibcode:
- 1974ApPhL..25..744P
- Keywords:
-
- Continuous Wave Lasers;
- Feedback Control;
- Frequency Control;
- Gallium Arsenide Lasers;
- Junction Diodes;
- Laser Modes;
- Gratings (Spectra);
- Laser Outputs;
- Optical Coupling;
- Spectrum Analysis;
- Tuning;
- Lasers and Masers