Multimode oscillation in semiconductor lasers
Abstract
Instability during transition to multimode oscillation when a strong external source is used to pump electrons and holes in a semiconductor is analyzed. For a nonzero dipole moment, corresponding to an interband transition, and coinciding extremes of the conduction and valence bands, a photon instability occurs at the frequency given by the difference between the electron and hole quasi-Fermi levels. Simultaneous Bose condensation of electron-hole pairs and photons corresponds to transition of the system to lasing regime. However, a state with one photon condensate at the above-mentioned frequency in the presence of small electron and photon damping turns out to be unstable. The system can pass over to multimode oscillation. For three-mode oscillation, the distance between modes is found to be of the order of the energy slot in the electron spectrum, and the amplitude of the side modes to be much less than the amplitude of the fundamental mode.
- Publication:
-
Zhurnal Eksperimentalnoi i Teoreticheskoi Fiziki
- Pub Date:
- April 1978
- Bibcode:
- 1978ZhETF..74.1489K
- Keywords:
-
- Laser Modes;
- Multimode Resonators;
- Semiconductor Lasers;
- Systems Stability;
- Dipole Moments;
- Electron Pumping;
- Holes (Electron Deficiencies);
- Photons;
- Lasers and Masers