New publication in Phys. Rev. Applied: Long-lived refractive-index changes induced by femtosecond ionization in gas-filled single-ring photonic-crystal fibers

Plasma recombination always follows photoionization of gas by intense femtosecond laser pulses, causing refractive-index changes via thermal and hydrodynamic effects. In gas-filled hollow-core photonic crystal fibers, these phenomena are induced by self-compressing pulses with microjoule energies. Using spatially-resolved interferometric probing from the side of the fiber, we uncover refractive-index changes with tens-of-µs lifetimes and observe plasma-driven acoustic waves that excite megahertz vibrations in the microstructure of the fiber. Our results imply that temporal non-local interactions of successive pulses will become important in any gas-based laser system operating simultaneously at high intensities and repetition rates.

Read full publication: J. R. Koehler, F. Köttig, B. M. Trabold, F. Tani, and P. St.J. Russell, Phys. Rev. Applied  10, 064020 (2018)



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