Berlin 2001 – scientific programme

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P: Plasmaphysik

P 9: Dense Plasmas and Plasma Diagnostic (Poster Session)

P 9.13: Poster

Tuesday, April 3, 2001, 12:30–15:00, AT2

Temporal characterization of 3/2-harmonic radiation from femtosecond laser produced plasmas — •L. Veisz, W. Theobald, T. Feurer, H. Schwoerer, and R. Sauerbrey — Institute of Optics and Quantumelectronics Friedrich-Schiller-Universität Jena, Max-Wien-Platz 1, 07743 Jena

3/2-harmonic radiation originates from the interaction of a high intensity femtosecond laser pulse with a laser produced plasma. This instability growths exponentially in time in the linear regime.

We measured the pulse duration of the 3/2-harmonic signal using a specially designed SHG autocorrelator with high sensitivity. Applying a discrimination technique allows to measure the 3/2-harmonic pulse duration as a function of the 3/2 ω energy for a constant laser intensity. From such a measurement it is possible to deduce the growth rate of the instability.