Intersubband electroluminescence from long-side-cleaved quantum-cascade lasers above threshold: Investigation of phonon bottleneck effects

Raffaele Colombelli, Federico Capasso, Claire Gmachl, Alessandro Tredicucci, A. Michael Sergent, Albert L. Hutchinson, Deborah L. Sivco, Alfred Y. Cho

Research output: Contribution to journalArticle

16 Scopus citations

Abstract

A technique is reported which allows the observation of intersubband spontaneous emission in unipolar quantum-cascade lasers above threshold. The technique consists of cleaving the laser stripe in the direction perpendicular to its facets. This does not negatively affect the operation of the lasers thanks to their unipolar nature. To show the potential of the method, we apply it to superlattice quantum-cascade (QC) lasers with various active region designs. We directly observe the saturation of the luminescence intensity at the laser transition, and a bottleneck effect for transitions separated from the lasing one by less than one optical phonon. This technique should help in the optimization of QC lasers.

Original languageEnglish (US)
Pages (from-to)3893-3895
Number of pages3
JournalApplied Physics Letters
Volume77
Issue number24
DOIs
StatePublished - Dec 11 2000
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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    Colombelli, R., Capasso, F., Gmachl, C., Tredicucci, A., Sergent, A. M., Hutchinson, A. L., Sivco, D. L., & Cho, A. Y. (2000). Intersubband electroluminescence from long-side-cleaved quantum-cascade lasers above threshold: Investigation of phonon bottleneck effects. Applied Physics Letters, 77(24), 3893-3895. https://doi.org/10.1063/1.1330566