The International Society for Optics and Photonics
CREOL, The College of Optics & Photonics
The mission of SPIE Student Chapter is to advance an interdisciplinary approach to the science and application of light and provide professional development opportunities for UCF students.

Seminar: "Development and application of laser driven coherent x-ray sources", Christian Spielmann

Christian Spielmann
Friedrich Schiller University

Abstract:
The direct generation of ultra short laser pulses opened the new area of time-resolved laser spectroscopy. Due to the high field strength, the wavelength range can be extended with nonlinear frequency conversion techniques. A very successful approach for table-top coherent x-ray sources is high harmonic generation (HHG), which can produce sub-femtosecond XUV or x-ray pulses in a laser like beam with compact and high repetition rate laser systems. The major drawback of HHG is the low conversion efficiency. Possible ways to overcome this limitation are quasi-phase-matching schemes and/or parametric amplification of HH radiation in noble gases in an energy range around 50 eV and 300 eV, respectively. Using more energetic lasers, electrons can be accelerated up to relativistic velocities in a few mm long noble gas jet. Under optimized conditions, the electrons start to oscillate transversally and emit spatially coherent betatron radiation in the few keV range. The broad spectrum is ideally suited for studying transient states of matter with time-resolved x-ray absorption spectroscopy.

For More Information:
Leslie Bilger
407-823-6890
lbilger@creol.ucf.edu

Posted Wednesday, April 25, 2012

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