Erlangen 2018 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 64: Quantum Optics and Photonics IV

Q 64.6: Talk

Friday, March 9, 2018, 11:45–12:00, K 0.016

Transient Raman scattering in hollow-core photonic crystal fibers filled with gas mixtures — •Pooria Hosseini, David Novoa, and Philip St.J. Russell — Max Planck Institute for the Science of Light, Erlangen, Germany

Previous reports on stimulated Raman scattering (SRS) in mixtures of Raman-active and noble gases indicate that the addition of a dispersive buffer gas increases the phase-mismatch to higher-order Stokes/anti-Stokes sidebands, resulting in preferential conversion to the first few Stokes lines, accompanied by a significant reduction in Raman gain. Gas-filled hollow-core photonic crystal fibers (HC-PCFs) permit, however, operation in the so-called transient SRS regime, where the Raman gain is marginally reduced owing to the high pump intensities and long interaction lengths attainable. We report the generation of a dense cluster of Raman sidebands in the ultraviolet-visible region using a mixture of hydrogen-deuterium-xenon with 1-ns-long laser pulses of only 5 μJ energy at 532 nm. In addition, we show that, provided the dispersion can be precisely controlled, the effective Raman gain in gas-filled HC-PCF can actually be significantly enhanced when a buffer gas is added. This counterintuitive behavior occurs when the nonlinear coupling between the interacting fields is strong and can result in a performance similar to that of a pure Raman-active gas, but at much lower total gas pressure, allowing competing effects such as Raman backscattering to be suppressed.