Hamburg 2009 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 53: Ultrakurze Pulse: Anwendungen III
Q 53.3: Talk
Thursday, March 5, 2009, 17:00–17:15, VMP 6 HS-A
Pulse characterization in the UV down to 263 nm by autocorrelation measurement using diamond photodiodes — •Fabian Kleimeier1, Thorben Haarlammert1, Jean-Francois Hochedez2, Ali BenMoussa2, Udo Schühle3, and Helmut Zacharias1 — 1Physikalisches Institut, Westfälische Wilhelms-Universität, Wilhelm-Klemm-Str. 10, 48149 Münster, Germany — 2Royal Observatory of Belgium, Ringlaan 3, 1180 Brussels, Belgium — 3Max-Planck-Institut für Sonnensystemforschung, Max-Planck-Str. 2, 37191 Katlenburg-Lindau, Germany
Interferometric second-order autocorrelation is a common way to characterise ultra-short pulses. Until recently this method was limited to wavelengths greater than 400 nm due to the lack of nonlinear materials or photodiodes with a sufficiently large bandgap. Solar-blind diamond pin-photodiodes developed within the LYRA project for the space mission PROBA-II have a bandgap of 5.5 eV, corresponding to a wavelength of about 225 nm, which permits two-photon absorption of light at wavelength longer than about 230 nm without significant background by a linear response. Using these diodes we were able to record fringe-resolved second-order autocorrelations of the second and third harmonic of a Ti:sapphire laser. The phase can be reconstructed by optimization algorithms using schemes like PICASO (femtosecond pulse retrieval by Phase and Intensity from Correlation And Spectrum Only).