Molecular dispersion spectroscopy based on Fabry-Perot quantum cascade lasers

Lukasz A. Sterczewski, Jonas Westberg, Gerard Wysocki

Research output: Contribution to journalArticlepeer-review

15 Scopus citations


Two Fabry-Perot quantum cascade lasers are used in a differential dual comb configuration to perform rapidly swept dispersion spectroscopy of low-pressure nitrous oxide with <1 ms acquisition time. Active feedback control of the laser injection current enables simultaneous wavelength modulation of both lasers at kilohertz rates. The system demonstrates similar performance in both absorption and dispersion spectroscopy modes and achieves a noise-equivalent absorption figure of merit in the low 10-4/√Hz range.

Original languageEnglish (US)
Pages (from-to)243-246
Number of pages4
JournalOptics Letters
Issue number2
StatePublished - Jan 15 2017

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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