A narrow-linewidth, frequency-stabilized OPO for sub-Doppler molecular spectroscopy around 3 μm

Iolanda Ricciardi, Eduardo De Tommasi, Pasquale Maddaloni, Simona Mosca, Alessandra Rocco, Jean Jacques Zondy, Maurizio De Rosa, Paolo De Natale

Research output: Chapter in Book/Report/Conference proceedingConference contribution

6 Citations (Scopus)


We present a widely-tunable, singly-resonant optical parametric oscillator, emitting more than 1 W in the region between 2.7 and 4.2 μm. Two configurations have been studied in order to improve the frequency stability and the linewidth of the OPO emission. First, we stabilized the signal frequency to a high-finesse Fabry-Pérot cavity. Then, we locked both pump and signal frequency to the frequency comb generated by a NIR fs mode-locked fibre laser, linked to the caesium primary standard. With this last configuration we carried out saturation spectroscopy of several transitions belonging to the ν 1 rovibrational band of CH 3I, resolving their electronic quadrupole hyperfine structure, and determining the absolute frequency of the hyperfine components with a 50-kHz-uncertainty. An upper limit for the idler linewidth has been estimated as 200 kHz FWHM.

Original languageEnglish
Title of host publicationNonlinear Optics and Applications VI
Publication statusPublished - 2012
Externally publishedYes
EventNonlinear Optics and Applications VI - Brussels, Belgium
Duration: Apr 16 2012Apr 18 2012

Publication series

NameProceedings of SPIE - The International Society for Optical Engineering
ISSN (Print)0277-786X


OtherNonlinear Optics and Applications VI


  • Hyperfine structure
  • Optical frequency comb
  • Optical parametric oscillator
  • Sub-Doppler spectroscopy

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Computer Science Applications
  • Applied Mathematics
  • Electrical and Electronic Engineering

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