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Single shot detection and noise analysis

Date Do, 02.05.2013 - Do, 02.05.2013
Time 10.15
Speaker Dr. Ariana Rondi, Institute of Applied Physics, University of Bern
Location Universität Bern, Institut für Angewandte Physik, Gebäude exakte Wissenschaften, Hörsaal B116, Sidlerstrasse 5, 3012 Bern
Program Femtosecond pump-probe spectroscopy is a very powerful technique for the observation of ultrafast dynamical processes in molecules. In the last decades, the laser technology necessary for such experiments (femtosecond, broadband, high energy pulses) has become "off the shelf". While most pump-probe experiments aim at getting the best possible time resolution, a lot of efforts also go for obtaining the best signal to noise ratio (SNR), while maintaining a reasonable data accumulation time. Single-shot detection is a powerful approach for improving SNR, since it allows to correct for several important sources of noise, like intensity fluctuations of the laser, or mechanical instabilities of the experimental setup. We have developed a fast multichannel detection system for femtosecond pump-probe spectroscopy, capable of detecting single shot broadband spectra at the repetition rate of an amplified femtosecond laser system (kHz). I will present the measurements done to characterize the noise of our laser source. I will then describe our detection system, and the pump- probe experiments (transient absorption and broadband stimulated Raman spectroscopy) that we intend to conduct with this setup.
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