Atmospheric observations of multiple molecular species using ultra-high-resolution external cavity quantum cascade laser heterodyne radiometry

Damien Weidmann, Tracy Tsai, Neil A. Macleod, Gerard Wysocki

Research output: Contribution to journalArticle

22 Scopus citations

Abstract

We demonstrate a widely tunable laser heterodyne radiometer operating in the thermal IR during an atmospheric observation campaign in the solar occultation viewing mode. An external cavity quantum cascade laser tunable within a range of 1120 to 1238cm-1 is used as the local oscillator (LO) of the instrument. Ultra-high-resolution (60MHz or 0:002cm-1) transmission spectroscopy of several atmospheric species (water vapor, ozone, nitrous oxide, methane, and dichlorodifluoromethane) has been demonstrated within four precisely selected molecule-specific narrow spectral windows (̃1 cm-1). Atmospheric transmission lines within each selected window were fully resolved through mode-hop-free continuous tuning of the LO frequency. Comparison measurements were made simultaneously with a high-resolution Fourier transform spectrometer to demonstrate the advantages of the laser heterodyne system for atmospheric sounding at high spectral and spatial resolutions.

Original languageEnglish (US)
Pages (from-to)1951-1953
Number of pages3
JournalOptics Letters
Volume36
Issue number11
DOIs
StatePublished - Jun 1 2011

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics

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