Stuttgart 2012 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 54: Poster 3
Q 54.25: Poster
Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II
Intensity measurement of strong laser beams using multi-photon Thomson scattering — Omri Har-Shemesh, •Felix Mackenroth, and Antonino Di Piazza — Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, Heidelberg, Germany
The development of strong laser pulses (intensity I > 1020 W/cm2) is of both theoretical and practical interest. Intensities as high as 2 × 1022 W/cm2 have already been reported [1], and are expected to increase even more in the near future.
The precise measurement of the intensity of such strong laser pulses is very challenging. The equipment involved in intensity measurements for lower-intensity lasers cannot withstand such strong fields, and the tight focus of these latter pulses introduces further complications.
In this work we propose a new method for measuring the intensity of strong laser fields. Our method exploits the well-known fact that when ultra-relativistic electrons are accelerated they emit radiation primarily in a narrow-cone around the direction of their instantaneous velocity [2]. By allowing ultra-relativistic electrons to propagate through a strong laser field, and by measuring the spectrum of the radiation emitted, it is shown that the value of the peak laser intensity can be inferred.
References
[1] V. Yanovsky et al., Opt. Express 16, 2109 (2008)
[2] J.D. Jackson, Classical Electrodynamics, 3rd edition, Chapter 14.