Dresden 2011 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 15: Poster 1: Quanteninformation, Quanteneffekte, Laserentwicklung, Laseranwendungen, Ultrakurze Pulse, Photonik
Q 15.66: Poster
Montag, 14. März 2011, 16:30–19:30, P1
New kind of single-shot pulse length measurement of intense few-cycle laser pulses — •T. Rathje1, A. M. Sayler1, W. Müller1, C. Kürbis1, K. Rühle1, G. Stibenz2, and G. G. Paulus1 — 1Institut für Optik und Quantenelektronik and Helmholtz Institut Jena, Max-Wien-Platz 1, 07743 Jena, Germany — 2APE GmbH, Plauener Str. 163-165, 13053 Berlin, Germany
Intense few-cycle (4–8 fs) laser pulses at 790 nm are now being used in a wide variety of application, including the production of attosecond extrem-ultraviolet (XUV) pulses. Since these experiments are sensitive to the electric field of the laser light, the characterization of the waveform is critical for the understanding and control of these interactions. We present a new technique to determine the pulse length by using a stereographic laser-induced above-threshold ionization (ATI) measurement of Xe, i.e. the same technique that provides precise, real-time, every-single-shot carrier-envelope phase measurement of ultrashort laser pulses. By comparing the left and right electron time-of-flight signals in the stereographic ATI apparatus we can calculate the asymmetry of the lasers electric field in real-time for every individual laser shot. This asymmetry increases when the pulse length decreases and vice versa. The corresponding relationship allows us to determine the temporal waveform of every single pulse in a kHz pulse train within the Gaussian pulse approximation. For calibration we used a few-cycle spectral phase interferometer for direct electric-field reconstruction (SPIDER). Our measurements roughly agree with calculations done using quantitative rescattering theory (QRS).