Speaker
Deepak Kumar
Description
See the full Abstract at http://ocs.ciemat.es/EPS2018ABS/pdf/P4.2021.pdf
Characterization of ellipsoidal plasma mirrors beyond the paraxial
approximation
D. Kumar1 , M. Šmíd1 , E. Chacon-Golcher1 , J. Fuchs2 , M. Morrissey1 , M. Nakatsutsumi3 ,
O. Klimo1 , S. Weber1
1 Institute of Physics of the ASCR, ELI-Beamlines project, Prague, Czech Republic
2 LULI, Ecole Polytechnique, Palaiseau, France
3 European XFEL, Hamburg, Germany
Ellipsoidal plasma mirrors (EPM) can demagnify the focal spot from a conventional off axis
parabolic (OAP) optic to yield ultra high focused intensities beyond the range of 1023 W/cm2
in upcoming laser facilities[1, 2]. The design of these EPMs have traditionally used paraxial
approximation to estimate the achievable demagnification[3]. However, numerical codes do
exist to characterize the focal spot diameter under tightly focused condition when the output
focal spot diameter is comparable to the laser wavelength[4]. In this presentation we compare
the measured focal spots to the theoretically predicted values (without paraxial approximation).
These results thus guide us to design the simplest geometry of the EPM to achieve a tightly
focused spot for a given OAP.
Our work is supported by Czech Science Foundation project 18-09560S.
References
[1] M. Nakatsutsumi, A. Kon, S. Buffechoux et al, Optics letters 35, 13 (2010)
[2] R. Wilson, M. King, R.J. Gray et al, Physics of Plasmas 23, 033106 (2016)
[3] A. Kon, M. Nakatsutsumi, S. Buffechoux et al, Journal of Physics: Conference Series 244,
032008 (2010)
[4] T. M. Jeong, S. Weber, B. LeGarrec et al, Optics Express 23, 9, pp. 11641-11656 (2015)
