Observation of reverse saturable absorption of an x-ray laser

0482989 - FZÚ 2018 RIV US eng J - Journal Article
Cho, B.I. - Cho, M.S. - Kim, M. - Chung, H.-K. - Barbrel, B. - Engelhorn, K. - Burian, Tomáš - Chalupský, Jaromír - Ciricosta, O. - Dakovski, G.L. - Hájková, Věra - Holmes, M. - Juha, Libor - Krzywinski, J. - Lee, R. W. - Nam, C. H. - Rackstraw, D.S. - Toleikis, S. - Turner, J.J. - Vinko, S.M. - Wark, J. S. - Zastrau, U. - Heimann, P.A.
Observation of reverse saturable absorption of an x-ray laser.
Physical Review Letters. Roč. 119, č. 7 (2017), s. 1-5, č. článku 075002. ISSN 0031-9007. E-ISSN 1079-7114
Institutional support: RVO:68378271
Keywords : free-electron laser * coherent light source * 2-photon absorption * hot aluminium plasma * opacity
OECD category: Fluids and plasma physics (including surface physics)
Impact factor: 8.839, year: 2017

We report the first observation of decreasing x-ray transmission in a solid target pumped by intense x-ray free electron laser pulses. The measurement has been made below the K-absorption edge of aluminum, and the x-ray intensity ranges are 1016 –1017 W/cm2. It has been confirmed by collisional radiative population kinetic calculations, underscoring the fast spectral modulation of the x-ray pulses and charge states relevant to the absorption and transmission of x-ray photons. The processes shown through detailed simulations are consistent with reverse saturable absorption, which would be the first observation of this phenomena in the x-ray regime. These light matter interactions provide a unique opportunity to investigate optical transport properties in the extreme state of matters, as well as affording the potential to regulate ultrafast x-ray freeelectron.
Permanent Link: http://hdl.handle.net/11104/0281781