Chirped laser dispersion spectroscopy using a directly modulated quantum cascade laser

Andreas Hangauer, Georg Spinner, Michal Nikodem, Gerard Wysocki

Research output: Contribution to journalArticle

19 Scopus citations

Abstract

Chirped laser dispersion spectroscopy (CLaDS) utilizing direct modulation of a quantum cascade laser (QCL) is presented. By controlling the laser bias nearly single- and dual-sideband CLaDS operation can be realized in an extremely simplified optical setup with no external optical modulators. Capability of direct single-sideband modulation is a unique feature of QCLs that exhibit a low linewidth enhancement factor. The developed analytical model shows excellent agreement with the experimental, directly modulated CLaDS spectra. This method overcomes major technical limitations of mid-infrared CLaDS systems by allowing significantly higher modulation frequencies and eliminating optical fringes introduced by external modulators.

Original languageEnglish (US)
Article number191107
JournalApplied Physics Letters
Volume103
Issue number19
DOIs
StatePublished - Nov 4 2013

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

Fingerprint Dive into the research topics of 'Chirped laser dispersion spectroscopy using a directly modulated quantum cascade laser'. Together they form a unique fingerprint.

  • Cite this