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RAMAN-SCATTERING; BREATH ANALYSIS; SPECTROSCOPY; GENERATION; PHASEOptics;
Abstract:
We report the use of coherent anti-Stokes Raman spectros-copy (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 (> 4000 cm(-1)) single-shot CARS with an unprecedented resolution of similar to 100 MHz. A kagome-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. (C) 2017 Optical Society of America
