Coherent control schemes for the photoionization of neon and helium in the Extreme Ultraviolet spectral region

Scientific Reports
Luca GiannessiKlaus Bartschat

Abstract

The seeded Free-Electron Laser (FEL) FERMI is the first source of short-wavelength light possessing the full coherence of optical lasers, together with the extreme power available from FELs. FERMI provides longitudinally coherent radiation in the Extreme Ultraviolet and soft x-ray spectral regions, and therefore opens up wide new fields of investigation in physics. We first propose experiments exploiting this property to provide coherent control of the photoionization of neon and helium, carry out numerical calculations to find optimum experimental parameters, and then describe how these experiments may be realized. The approach uses bichromatic illumination of a target and measurement of the products of the interaction, analogous to previous Brumer-Shapiro-type experiments in the optical spectral range. We describe operational schemes for the FERMI FEL, and simulate the conditions necessary to produce light at the fundamental and second or third harmonic frequencies, and to control the phase with respect to the fundamental. We conclude that a quantitative description of the phenomena is extremely challenging for present state-of-the-art theoretical and computational methods, and further development is necessary. Furthermore, t...Continue Reading

References

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Jun 12, 2012·Physical Review Letters·L GiannessiV Surrenti
Oct 26, 2013·Nature Communications·Eiji J TakahashiKatsumi Midorikawa
May 31, 2017·Nature Communications·Sergey UsenkoTim Laarmann

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Citations

Jul 13, 2019·Physical Review Letters·M A KhokhlovaV Averbukh
Dec 7, 2019·Physical Review Letters·Michele Di FraiaKiyoshi Ueda

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Software Mentioned

Ginger
PERSEO
LS
FERMI
PT

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