Broadband high-resolution multi-species CARS in gas-filled hollow-core photonic crystal fiber
| Autor: | Robert J. R. Hupfer, Amir Abdolvand, Barbara M. Trabold, Philip St.J. Russell |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
business.industry Physics::Optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Atomic and Molecular Physics and Optics Supercontinuum Trace gas 010309 optics Core (optical fiber) symbols.namesake Optics Zero-dispersion wavelength 0103 physical sciences Broadband symbols Coherent anti-Stokes Raman spectroscopy 0210 nano-technology business Raman scattering Photonic-crystal fiber |
| Zdroj: | Optics letters. 42(17) |
| ISSN: | 1539-4794 |
| Popis: | 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 (>4000 cm−1) single-shot CARS with an unprecedented resolution of ∼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. |
| Databáze: | OpenAIRE |
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