Grating-cavity continuous-wave optical parametric oscillators for high-resolution mid-infrared spectroscopy

Markku Vainio, Mikael Siltanen, Jari Peltola, Lauri Halonen (Corresponding Author)

Research output: Contribution to journalArticleScientificpeer-review

36 Citations (Scopus)


The use of grating as a spectral filter provides a simple way of improving wavelength tuning and stability of continuous-wave optical parametric oscillators (cw OPOs). In this paper, we discuss how to design and use such grating-cavity cw OPOs for high-resolution spectroscopy in the molecular fingerprint region at ∼3μm. The first design presented in the paper is based on a metal-coated diffraction grating, which produces fast and broad wavelength tuning and high wavelength stability. The second design uses a bulk Bragg grating for high optical power and good spectral purity. We report a new Bragg-grating OPO and demonstrate its use in a Doppler-free absorption spectroscopy of CH4 at ∼3.22μm. In addition, we describe a new balanced detection scheme, which can be used to improve the signal-to-noise ratio of absorption measurements if the measurement noise is limited by the intensity noise of the mid-infrared OPO.
Original languageEnglish
Pages (from-to)A1-A10
JournalApplied Optics
Issue number4
Publication statusPublished - 2011
MoE publication typeA1 Journal article-refereed


  • spectroscopy
  • oscillators


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