Observation of the nonequilibrium optical phonons population associated with electron transport in quantum-cascade lasers is reported. The phonon occupation number was measured in the range 75-280 K by using a combination of microprobe photoluminescence and Stokes/anti-Stokes Raman spectroscopy. The excess phonon population is observed to decrease as the lattice temperature increases. From the nonequilibrium phonon population, we extracted interface phonon lifetimes of 5 ps at 75 K and 2 ps at 280 K.
|Titolo:||Nonequilibrium optical phonon generation by steady-state electron transport in quantum-cascade lasers|
|Data di pubblicazione:||2002|
|Digital Object Identifier (DOI):||10.1063/1.1481186|
|Appare nelle tipologie:||1.1 Articolo in rivista|