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Q: Fachverband Quantenoptik und Photonik
Q 37: Laser applications: Spectroscopy
Q 37.2: Talk
Wednesday, March 20, 2013, 14:15–14:30, F 142
Interferometric Femtosecond Stimulated Raman Scattering — •Sven Dobner1, Carsten Cleff1, Carsten Fallnich1, and Petra Groß2 — 1Institut für Angewandte Physik, Westfälische Wilhelms-Universität, 48149 Münster — 2Institut für Physik, Carl von Ossietzky Universität, 26129 Oldenburg, Deutschland
We present an optical method for background suppression in femtosecond stimulated Raman spectroscopy (FSRS) based on linear interferometry [1]. An unbalanced Sagnac interferometer reaches an unprecedented background reduction of 17 dB over a broad bandwidth of 60 THz (2000 cm−1) and thereby increases the signal-to-background ratio in the measurement. The interferometric measurement does not reduce the Raman signal to a simple loss signature in the spectrum, but reveals the phase shift, gathered within the nonlinear interaction, as a dispersive lineshape, which is recreated with a simple Lorentzian oscillator model.
[1] Dobner et al., J. Chem. Phys. 137, 174201 (2012)