Characterization of quantum-cascade lasers using single-pass transmission spectroscopy

Afusat O. Dirisu, Dmitry G. Revin, Zhijun Liu, Kenneth Kennedy, John W. Cockburn, Claire F. Gmachl

Research output: Contribution to journalArticlepeer-review

2 Scopus citations


The study of the electron distribution and intersubband transitions in quantum cascade (QC) lasers provides fundamental insights into the laser operation. Measurements on intersubband transitions are often performed on QC lasers under nonoperating conditions, i.e., at zero electric field. In this study, a single-pass transmission technique that allows for probing of QC lasers under operating conditions was used. The measurements and analysis were done on QC lasers with vertical and diagonal transition active region designs operating at λ ∼ 10 μm. The single-pass modal gain coefficients, extracted for the vertical transition design, were 24.04 cm/kA at 100 K, 21.36 cm/kA at 125 K, 14.25 cm/kA at 150 K, and 5.26 cm/kA at 175 K.

Original languageEnglish (US)
Pages (from-to)586-593
Number of pages8
JournalIEEE Journal of Quantum Electronics
Issue number6
StatePublished - 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics
  • Electrical and Electronic Engineering


  • Intersubband (ISB) absorption
  • Optical gain
  • Quantum cascade (QC) laser
  • Spectroscopy


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