Counter propagating solitons to study ultrafast polarizability changes in gas-filled fiber.

Tani F., Suresh M.I., Koehler J.R., Russell P.St.J.

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II - Fisica della materia
GSSI Ex ISEF - Aula C - Giovedì 26 h 09:00 - 12:30
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We present a novel pump-probe technique for monitoring ultrafast polarizability changes, focusing in particular on measuring the plasma density created at the temporal focus of a self-compressing higher-order soliton in gas-filled hollow core fibre. This is done by monitoring the wavelength of dispersive wave emission from a counter propagating soliton. By varying the relative delay between pump and probe, the plasma density distribution along the fibre can be conveniently mapped out. The technique provides an important new tool for probing photoionization in many different gases and gas mixtures as well as ultrafast refractive index changes in many other contexts.

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