Intersubband mid-infrared emission in optically pumped quantum wells

F. H. Julien, Z. Moussa, P. Boucaud, Y. Lavon, A. Sa'ar, J. Wang, J. P. Leburton, V. Berger, J. Nagle, R. Planel

Research output: Contribution to journalArticlepeer-review


Optical emission between excited subbands of asymmetric coupled GaAs/AlGaAs quantum wells is investigated. The structures are designed to present an energy separation between the ground subband and the first excited subband close to the LO-phonon energy in order to enhance the non-radiative relaxation between those states. Optical pumping at 10 μm is used to excite electrons in the third subband. A mid-infrared emission at 14 μm is shown to take place between the third and second subbands. The spontaneous emission is observed up to room temperature. The radiative efficiency is ≈60 nW/W in lightly doped samples. We also predict that this situation is very effective for achieving almost complete population inversion as well as large stimulated gains. The possibility of mid-infrared intersubband emission under band-to-band optical pumping is also discussed.

Original languageEnglish (US)
Pages (from-to)69-79
Number of pages11
JournalSuperlattices and Microstructures
Issue number1
StatePublished - Jan 1996

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


Dive into the research topics of 'Intersubband mid-infrared emission in optically pumped quantum wells'. Together they form a unique fingerprint.

Cite this