Intracavity trace molecular detection with a broadband mid-IR frequency comb source

Magnus W Haakestad, Tobias P Lamour, Nick Leindecker, Alireza Marandi, Konstantin L Vodopyanov

Research output: Contribution to journalArticle

39 Citations (Scopus)

Abstract

Ultrasensitive detection of methane, isotopic carbon dioxide, carbon monoxide, formaldehyde, acetylene, and ethylene is performed in the spectral range 2.5-5 mu m using intracavity spectroscopy in broadband optical parametric oscillators (OPOs). The OPOs were operated near degeneracy and synchronously pumped either by a mode-locked erbium (1560 nm) or thulium (2050 nm) fiber laser. A large instantaneous bandwidth of up to 800 cm(-1) allows for simultaneous detection of several gases. We observe an effective path-length enhancement due to coherent interaction inside the OPO cavity and achieve part-per-billion sensitivity levels. The measured spectral shapes are in good agreement with a model that takes into account group delay dispersion across the broad OPO frequency band. (c) 2013 Optical Society of America

Original languageEnglish
Pages (from-to)631-640
Number of pages10
JournalJournal of the Optical Society of America B: Optical Physics
Volume30
Issue number3
DOIs
Publication statusPublished - 1 Mar 2013

Keywords

  • OPTICAL PARAMETRIC OSCILLATOR
  • FOURIER-TRANSFORM SPECTROSCOPY
  • ABSORPTION-SPECTROSCOPY
  • MU-M
  • FEMTOSECOND LASER
  • BREATH ANALYSIS
  • SPECTROMETER
  • TIME

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