Optical frequency comb Faraday rotation spectroscopy

Alexandra C. Johansson, Jonas Westberg, Gerard Wysocki, Aleksandra Foltynowicz

Research output: Contribution to journalArticlepeer-review

12 Scopus citations


We demonstrate optical frequency comb Faraday rotation spectroscopy (OFC-FRS) for broadband interference-free detection of paramagnetic species. The system is based on a femtosecond doubly resonant optical parametric oscillator and a fast-scanning Fourier transform spectrometer (FTS). The sample is placed in a DC magnetic field parallel to the light propagation. Efficient background suppression is implemented via switching the direction of the field on consecutive FTS scans and subtracting the consecutive spectra, which enables long-term averaging. In this first demonstration, we measure the entire Q- and R-branches of the fundamental band of nitric oxide in the 5.2–5.4 µm range and achieve good agreement with a theoretical model.

Original languageEnglish (US)
Article number79
JournalApplied Physics B: Lasers and Optics
Issue number5
StatePublished - May 1 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)
  • General Physics and Astronomy


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