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Publication Citation: Precision spectroscopy with frequency combs at 3.4 υm

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Author(s): Esther Baumann; Fabrizio R. Giorgetta; William C. Swann; Alexander M. Zolot; Ian R. Coddington; Nathan R. Newbury;
Title: Precision spectroscopy with frequency combs at 3.4 υm
Published: August 02, 2011
Abstract: We discuss precision spectroscopy with a comb-based spectrometer at 3.4 υm. Our goal is to explore comb-based spectroscopy as an alternative method for fast, highly resolved, accurate measurements of gas line shapes. The spectrometer uses dual 1.5 υm frequency combs down converted to 3.4 υm via difference frequency generation (DFG) with a stabilized 1 υm fiber laser. One 3.4 υm comb is transmitted through methane and heterodyned against the second, offset comb to measure the gas absorption and dispersion. Doppler-broadened methane spectral lines are measured to below 1 MHz uncertainty. We also discuss the higher sensitivity alternative of a comb-assisted swept-laser DFG spectrometer.
Proceedings: SPIE Optical Engineering + Applications 2011
Volume: 7790
Pages: 9 pp.
Location: San Diego, CA
Dates: August 21-26, 2011
Keywords: frequency combs; mid-IR; molecular spectroscopy
Research Areas: Molecular Physics, Instrumentation, Optical Physics
PDF version: PDF Document Click here to retrieve PDF version of paper (1MB)