Cavity-ringdown molecular spectroscopy based on an optical frequency comb at 1.45-1.65 μm

Michael J. Thorpe*, Darren D. Hudson, Kevin D. Moll, Jacob Lasri, Jun Ye

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

81 Citations (Scopus)

Abstract

Optical frequency comb-based cavity-ringdown spectroscopy has recently enabled high-sensitivity absorption detection of molecules over a broad spectral range. We demonstrate an improved system based on a mode-locked erbium-doped fiber laser source centered at 1.5 μm, resulting in a spectrometer that is inexpensive, simple, and robust. It provides a very large spectral bandwidth (1.45-1.65 μm) for investigation of a wide variety of molecular absorptions. Strong molecular absorptions at 1.5 μm allow for detection at sensitivities approaching the 1 part in 109 volume level. We provide a detailed description of our spectrometer and present measurements of the rovibrational spectra for CO, NH3, and C2H2 with an absorption sensitivity of 2 × 10-8 cm-1 Hz -1/2 per detection channel.

Original languageEnglish
Pages (from-to)307-309
Number of pages3
JournalOptics Letters
Volume32
Issue number3
DOIs
Publication statusPublished - 1 Feb 2007
Externally publishedYes

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