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.
Original language | English (US) |
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Pages (from-to) | 4303-4305 |
Number of pages | 3 |
Journal | Applied Physics Letters |
Volume | 80 |
Issue number | 23 |
DOIs | |
State | Published - Jun 10 2002 |
Externally published | Yes |
All Science Journal Classification (ASJC) codes
- Physics and Astronomy (miscellaneous)