All femtosecond optical pump and x-ray probe: holey-axicon for free electron lasers
Vijayakumar Anand,Jovan Maksimovic,Tomas Katkus,Soon Hock Ng,Orestas Ulčinas,Mindaugas Mikutis,Justas Baltrukonis,Antanas Urbas,Gintas Šlekys,H. Ogura,Daisuke Sagae,Tatiana Pikuz,Toshihiro Somekawa,Norimasa Ozaki,Arturas Vailionis,Gediminas Seniutinas,Vygantas Mizeikis,Karl Glazebrook,Jean P. Brodie,Paul R. Stoddart,Ludovic Rapp,Andrei Rode,Eugene G Gamaly,Saulius Juodkazis +23 more
- Vol. 3, Iss: 2, pp 024002
TLDR
In this paper, a co-axial pump (optical)-probe (x-rays) experimental concept and show performance of the optical component are presented and different realisations of optical pump are discussed.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.read more
Citations
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Conductive dense hydrogen
Mikhail Eremets,I. A. Troyan +1 more
TL;DR: A significant hysteresis indicates that the transformation of molecular hydrogen into a metal is accompanied by a first-order structural transition presumably into a monatomic liquid state.
Journal ArticleDOI
High-Order Vector Bessel-Gauss Beams for Laser Micromachining of Transparent Materials
TL;DR: In this paper, high-order vector Bessel-Gauss beams from a theoretical perspective were applied to transparent-material laser micromachining, and two geometric-phase-based optical elements, a highorder $S$-wave plate and an axicon in combination with simple optical elements such as lenses, wave plates, and polarizers, were demonstrated.
Journal ArticleDOI
Imaging with diffractive axicons rapidly milled on sapphire by femtosecond laser ablation
Daniel Smith,Soon Hock Ng,Molong Han,Tomas Katkus,Vijayakumar Anand,Karl Glazebrook,Saulius Juodkazis,Saulius Juodkazis +7 more
TL;DR: In this article, a fundamental diffractive optical element, binary axicon-axicon with two phase or amplitude levels, has been designed in three configurations namely conventional axicon, photon sieve axicon (PSA) and sparse PSA and directly milled onto a sapphire substrate.
Proceedings ArticleDOI
Femtosecond laser fabrication of diffractive optics for spatial and spectral imaging at synchrotron infrared beamlines
Vijayakumar Anand,Tomas Katkus,Soon Hock Ng,Jitraporn Vongsvivut,Jovan Maksimovic,Annaleise R. Klein,Keith R. Bambery,Stefan Lundgaard,Denver P. Linklater,Elena P. Ivanova,Mark J. Tobin,Saulius Juodkazis,Saulius Juodkazis +12 more
TL;DR: In this article, an indirect IR imaging technique based on the principles of correlation optics using diffractive optical elements such as random pinhole array (RPA) and Fresnel zone plate (FZP) was proposed.
Journal ArticleDOI
Tuning Axial Resolution Independent of Lateral Resolution in a Computational Imaging System Using Bessel Speckles
TL;DR: In this article , a basic study has been carried out with Bessel distribution as the fundamental building block of the speckle pattern (i.e., speckles formed by randomly interfering Bessel beams).
References
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