Optical frequency comb Faraday rotation spectroscopy
Optics
2018-05-09 v1
Abstract
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 {\mu}m range and achieve good agreement with a theoretical model.
Cite
@article{arxiv.1801.08399,
title = {Optical frequency comb Faraday rotation spectroscopy},
author = {Alexandra C. Johansson and Jonas Westberg and Gerard Wysocki and Aleksandra Foltynowicz},
journal= {arXiv preprint arXiv:1801.08399},
year = {2018}
}