We analyze elementary properties of exciton and polariton lasers — devices that generate coherent optical and matter waves using final-state stimulation of exciton-phonon scattering. First we discuss the relation between the conditions for the onset of equilibrium and nonequilibrium excitonic condensates. Provided that the thermal de Broglie wavelength [Formula Presented] exceeds the exciton Bohr radius [Formula Presented], an exciton laser operates without electronic population inversion. In contrast to previous proposals, this is a different type of laser without inversion which utilizes many-body coherences. When the excitonic character of the polariton branch vanishes, a polariton laser becomes indistinguishable from a photon laser.
|Original language||English (US)|
|Number of pages||4|
|Journal||Physical Review A - Atomic, Molecular, and Optical Physics|
|State||Published - 1996|
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics