Hannover 2010 – scientific programme

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MO: Fachverband Molekülphysik

MO 7: Poster: Femtosecond Spectroscopy

MO 7.3: Poster

Tuesday, March 9, 2010, 16:00–18:30, Lichthof

Four-Wave Mixing Techniques with High Spatial Resolution — •Mahesh Namboodiri, Vinu V Namboodiri, Günter Flachenecker, and Arnulf Materny — Jacobs University Bremen, Bremen, Germany

Coherent anti-Stokes Raman scattering microscopy (Micro-CARS) is a promising new technique for the imaging of specific molecular components, combining vibrational contrast of molecules with high spatial resolution [1]. This high resolution is due to the nonlinear interaction of three laser beams resulting in a cubic dependence of the signal on the laser intensity, which is highest in the laser focus. Due to the use of the microscope optic a collinear beam geometry has to be chosen, which is giving rise to an unwanted non resonant CARS background covering the signal. In our presentation, we show concepts and supported by experimental results suitable for a suppression of this background. Here, we mainly will focus on a femtosecond time-resolved three-color CARS. Additionally, we will discuss techniques for improving the spatial resolution of Micro-CARS.

References:

[1] A. Zumbusch, G.R. Holtom, X.S. Xie, Phys. Rev. Lett. 82, 4142 (1999)