@article { ISI:000175904600005,
	title = {Nonequilibrium optical phonon generation by steady-state electron transport in quantum-cascade lasers},
	journal = {APPLIED PHYSICS LETTERS},
	volume = {80},
	number = {23},
	year = {2002},
	month = {JUN 10},
	pages = {4303-4305},
	publisher = {AMER INST PHYSICS},
	type = {Article},
	address = {CIRCULATION \& FULFILLMENT DIV, 2 HUNTINGTON QUADRANGLE, STE 1 N O 1, MELVILLE, NY 11747-4501 USA},
	abstract = {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. (C) 2002 American Institute of Physics.},
	issn = {0003-6951},
	doi = {10.1063/1.1481186},
	author = {Spagnolo, V and Scamarcio, G and Troccoli, M and F. Capasso and C. Gmachl and Sergent, AM and Hutchinson, AL and Sivco, DL and Cho, AY}
}
