Preprint Article Version 1 This version is not peer-reviewed

All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser

Version 1 : Received: 24 May 2020 / Approved: 26 May 2020 / Online: 26 May 2020 (03:53:19 CEST)

How to cite: Anand, V.; Maksimovic, J.; Katkus, T.; Ng, S.H.; Ulcinas, O.; Mikutis, M.; Baltrukonis, J.; Urbas, A.; Slekys, G.; Ogura, H.; Sagae, D.; Pikuz, T.; Somekawa, T.; Ozaki, N.; Vailionis, A.; Seniutinas, G.; Mizeikis, V.; Glazebrook, K.; Brodie, J.P.; Stoddart, P.R.; Rapp, L.; Rode, A.V.; Gamaly, E.G.; Juodkazis, S. All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser. Preprints 2020, 2020050416 (doi: 10.20944/preprints202005.0416.v1). Anand, V.; Maksimovic, J.; Katkus, T.; Ng, S.H.; Ulcinas, O.; Mikutis, M.; Baltrukonis, J.; Urbas, A.; Slekys, G.; Ogura, H.; Sagae, D.; Pikuz, T.; Somekawa, T.; Ozaki, N.; Vailionis, A.; Seniutinas, G.; Mizeikis, V.; Glazebrook, K.; Brodie, J.P.; Stoddart, P.R.; Rapp, L.; Rode, A.V.; Gamaly, E.G.; Juodkazis, S. All Femtosecond Optical Pump and X-Ray Probe: Holey-Axicon for Free Electron Laser. Preprints 2020, 2020050416 (doi: 10.20944/preprints202005.0416.v1).

Abstract

We put forward a co-axial pump(optical)-probe(X-rays) experimental concept and show performance of the optical component. A Bessel beam generator with a central 100 micrometers-diameter hole (on the optical axis) was fabricated using femtosecond (fs) laser structuring inside a silica plate. This flat-axicon optical element produces a needle-like axial intensity distribution which can be used for the optical pump pulse. The fs-X-ray free electron laser (X-FEL) beam of sub-1 micrometer diameter can be introduced through the central hole along the optical axis onto a target as a probe. Different realisations of optical pump are discussed. Such optical elements facilitate alignment of ultra-short fs-pulses in space and time and can be used in light-matter interaction experiments at extreme energy densities on the surface and in the volume of targets. Full advantage of ultra-short 10 fs X-FEL probe pulses with fs-pump(optical) opens an unexplored temporal dimension of phase transitions and the fastest laser-induced rates of material heating and quenching. A wider field of applications of fs-laser-enabled structuring of materials and design of specific optical elements for astrophotonics is presented.

Subject Areas

X-rays; free electron laser (FEL); ultra-short phenomena; pump-probe; warm-dense matter; astrophotonics; co-axial volumetric interaction diagnostics

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