Efficient control of quantum paths via dual-gas high harmonic generation

Details Efficient control of quantum paths via dual-gas high harmonic generation Efficient control of quantum paths via dual-gas high harmonic generation

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011njph...13k3001w&link_type=abstract

New Journal of Physics, Volume 13, Issue 11, pp. 113001 (2011).

Physics

Scientific paper

The accurate control of the relative phase of multiple distinct sources of radiation produced by high harmonic generation is of central importance in the continued development of coherent extreme UV (XUV) and attosecond sources. Here, we present a novel approach which allows extremely accurate phase control between multiple sources of high harmonic radiation generated within the Rayleigh range of a single-femtosecond laser pulse using a dual-gas, multi-jet array. Fully ionized hydrogen acts as a purely passive medium and allows highly accurate control of the relative phase between each harmonic source. Consequently, this method allows quantum path selection and rapid signal growth via the full coherent superposition of multiple HHG sources (the so-called quasi-phase-matching). Numerical simulations elucidate the complex interplay between the distinct quantum paths observed in our proof-of-principle experiments.

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