Abstract
We report the use of coherent anti-Stokes Raman spectroscopy (CARS) in gas-filled hollow-core photonic crystal fiber (HC-PCF) for trace gas detection. The long optical path-lengths yield a 60 dB increase in the signal level compared with free-space arrangements. This enables a relatively weak supercontinuum (SC) to be used as Stokes seed, along with a ns pump pulse, paving the way for broadband () single-shot CARS with an unprecedented resolution of . A kagomé-style HC-PCF provides broadband guidance, and, by operating close to the pressure-tunable zero dispersion wavelength, we can ensure simultaneous phase-matching of all gas species. We demonstrate simultaneous measurement of the concentrations of multiple trace gases in a gas sample introduced into the core of the HC-PCF.
© 2017 Optical Society of America
Full Article | PDF ArticleMore Like This
Rinat Tyumenev, Luisa Späth, Barbara M. Trabold, Goran Ahmed, Michael H. Frosz, and Philip St.J. Russell
Opt. Lett. 44(10) 2486-2489 (2019)
Federico Belli, Amir Abdolvand, John C. Travers, and Philip St. J. Russell
Opt. Lett. 44(22) 5509-5512 (2019)
Jean-Michel Ménard and Philip St.J. Russell
Opt. Lett. 40(15) 3679-3682 (2015)