Hannover 2013 – wissenschaftliches Programm

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MO: Fachverband Molekülphysik

MO 14: Poster 1: Cluster, Femtosecond Spectroscopy

MO 14.20: Poster

Dienstag, 19. März 2013, 16:00–18:30, Empore Lichthof

Shot-to-shot data acquisition at 100 kHz for high-repetition pump–probe experiments — •Florian Kanal, Sabine Keiber, Reiner Eck, and Tobias Brixner — Institut für Physikalische und Theoretische Chemie, Universität Würzburg, Am Hubland, 97074 Würzburg

For laser systems with low repetition rates near 1 kHz it is easily possible to record transient absorption data via shot-to-shot techniques. State-of-the-art CCD cameras allow for broadband acquisition of every single probe pulse in the ultraviolet and visible spectral regime. By blocking every second pump pulse transient absorption changes can be monitored with good signal-to-noise ratios. In order to decrease the total measurement time high repetition rates are desirable. However, shot-to-shot techniques near 100 kHz are challenging due to limitations in CCD readout and mechanical shutter speed.

Here we present 100 kHz broadband shot-to-shot pump–probe spectroscopy. Using an ultrafast line camera in combination with a homebuilt high-speed mechanical chopper, we achieve single-pulse detection. This method combines the advantage of a broadband spectral detection with reduced measurement time.