High-resolution broadband (>100 cm-1) infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser

Damien Weidmann, Gerard Wysocki

Research output: Contribution to journalArticle

33 Scopus citations

Abstract

Broadband thermal infrared heterodyne spectro-radiometry using an external cavity quantum cascade laser as a tunable local oscillator has been performed over a frequency range of more than 100 cm-1 at a central frequency of 1190 cm-1. Heterodyne spectro-radiometry is demonstrated for two local oscillator tuning modes: broadband tuning for transmission and emission spectroscopy of broadband absorbers (Freon 12), and broadband frequency selection in combination with fine continuous frequency tuning for high-resolution (0.021 cm-1) transmission spectroscopy (N 2O). In each case concentration retrievals are performed and analyzed. The spectro-radiometer noise level is demonstrated to be twenty two and eight times the fundamental shot-noise limit in the two scanning modes respectively.

Original languageEnglish (US)
Pages (from-to)248-259
Number of pages12
JournalOptics Express
Volume17
Issue number1
DOIs
StatePublished - Jan 5 2009

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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