High-power λ≈8μm quantum cascade lasers with near optimum performance

Claire F. Gmachl, Alessandro Tredicucci, Federico Capasso, Albert L. Hutchinson, Deborah L. Sivco, James N. Baillargeon, Alfred Y. Cho

Research output: Contribution to journalArticle

106 Scopus citations

Abstract

Quantum cascade (QC) lasers emitting at λ≈8μm with a power performance equal to short-wavelength (λ≈5μm) QC lasers are reported. The device improvement is mainly achieved by a design of the injector/relaxation region, which at laser threshold allows resonant carrier injection between the ground state of the preceding and the upper laser level of the subsequent active region. In pulsed operation a peak output power of 1.3 W per facet has been measured at 100 K. At room temperature a record peak power of 325 mW and a record slope efficiency of 180 mW/A have been measured. In continuous-wave operation the maximum power at 30 K was 510 mW per facet and still 200 mW per facet at 80 K. The high values of the output power and slope efficiency demonstrate the validity of the cascading scheme, in which electrons above threshold generate one photon per each active region they successively traverse.

Original languageEnglish (US)
Pages (from-to)3130-3132
Number of pages3
JournalApplied Physics Letters
Volume72
Issue number24
DOIs
StatePublished - Dec 1 1998
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'High-power λ≈8μm quantum cascade lasers with near optimum performance'. Together they form a unique fingerprint.

  • Cite this

    Gmachl, C. F., Tredicucci, A., Capasso, F., Hutchinson, A. L., Sivco, D. L., Baillargeon, J. N., & Cho, A. Y. (1998). High-power λ≈8μm quantum cascade lasers with near optimum performance. Applied Physics Letters, 72(24), 3130-3132. https://doi.org/10.1063/1.121569