Singly-resonant optical parametric oscillators with pump-modulation transfer for frequency-modulated spectroscopy in the mid-infrared

I.D. Lindsay, P. Gross, Christopher James Lee, B. Adhimoolam, Klaus J. Boller

Research output: Chapter in Book/Report/Conference proceedingConference contributionAcademicpeer-review

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Frequency modulation (FM) techniques are well known methods for improving signal-to-noise ratios in laser spectroscopy. Such techniques have proven particularly effective with diode lasers due to the ease with which they can be frequency modulated via their injection current. Although singly-resonant optical parametric oscillators (OPOs) are flexible, powerful and widely-tunable sources for mid-infrared laser spectroscopy, the utilization of FM techniques with OPOs suffers from the inconvenience of requiring an external mid-IR modulator. As a consequence, FM techniques have not been implemented with such devices. In this paper we describe the implementation of wavelength-modulation spectroscopy (WMS) and frequency-modulation spectroscopy (FMS) using a singly-resonant OPO pumped by a fiber-amplified diode laser. The OPO was capable of producing output powers of up to 1W in the 3.15-3.8 μm range with continuous tuning over >100GHz on millisecond timescales. Frequency modulation, via injection current, of the diode laser transferred directly to the OPO's idler output, allowing mid-IR FM to be achieved without external modulation devices. WMS and FMS spectra of methane were then recorded, clearly demonstrating that this approach provides a means of implementing these important techniques with powerful, widely tunable, mid-IR sources while retaining the simple, flexible modulation properties of diode lasers.
Original languageEnglish
Title of host publicationProceedings of SPIE, The International Society for Optical Engineering
EditorsPeter E. Powers
Place of PublicationBellingham, WA, USA
ISBN (Print)9780819465689
Publication statusPublished - 23 Jan 2007
EventSPIE Photonics West 2007 - San Jose, United States
Duration: 20 Jan 200726 Jan 2007

Publication series

NameProceedings of SPIE
ISSN (Print)0277-786X


ConferenceSPIE Photonics West 2007
Country/TerritoryUnited States
CitySan Jose
Internet address


  • METIS-266561
  • IR-96129


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