Darmstadt 2008 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 49: Ultrakurze Laserpulse (Anwendungen II)
Q 49.2: Vortrag
Donnerstag, 13. März 2008, 16:45–17:00, 3H
Enhancement of the X-ray yield by adaptive shaping of ultrashort laser pulses — •Steffen Linden, Martin Silies, Henrik Witte, and Helmut Zacharias — Physikalisches Institut, Westfälische Wilhelms-Universität Münster
A deformable mirror is implemented in a laser-based hard X-ray experiment in order to increase the hard X-ray yield. The imperfect wavefront from the Ti:Sapphire CPA laser system is spatially changed by means of a piezoelectric deformable mirror before th focusing optics of the laser-plasma experiment. The hard X-ray yield of the generation process is detected by an X-ray sensitive Schottky diode. This diode delivers the feedback signal for an evolutionary algorithm, that controls the piezovoltages of the deformable mirror. After a series of generations of the algorithm with an adjustable number of individuals (one individuum represents one mirror deformation) the Fe−Kα yield is enhanced significantly.