A concept of all femtosecond co-axial pump(optical)-probe(X-rays) is proposed for Free Electron Laser at Spring-8 SACLA

A concept of all femtosecond co-axial pump(optical)-probe(X-rays) is proposed for Free Electron Laser at Spring-8 SACLA

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物質理工学院 Saulius Juodkazis特任教授の共著論文

“All femtosecond optical pump and X-ray probe: holey-axicon for free electron lasers”

が、J. Phys. Photonics   に掲載されました。(DOI:10.1088/2515-7647/abd4ef

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<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 µm 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 µm 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.