Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 55: Poster III

Q 55.39: Poster

Thursday, March 5, 2009, 16:30–19:00, VMP 8 Foyer

Combining fs pulse tailoring and self-phase modulation for nonlinear microscopy. — •Tillmann Kalas, Jens Köhler, Cristian Sarpe-Tudoran, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und CINSaT, Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

Nonlinear label-free microscopy is a powerful tool for the investigation of physical and biological samples with high spatial resolution. Often intrinsic Second- or Third-Harmonic Generation (SHG,THG) as well as Coherent Anti-Stokes Raman Scattering (CARS) is used as contrast mechanism.

We make use of femtosecond pulse shaping in combination with self-phase modulation (SPM) in order to generate the nonlinear signals [1,2]. Extending our previous studies [1], femtosecond laser pulses, amplitude and phase modulated in a narrow spectral interval, are focused into a waterjet serving as transparent sample. SPM leads to a redistribution of the power spectral density. Detailed observation of the intensity in the above mentioned spectral band holds the possibility to distinguish between different materials and their concentrations in a sample. Currently the impact of different pulse shapes on the SPM modified power spectral density is studied. In particular spectral phase dependencies to optimize possible contrast mechanisms are under investigation and results are presented.
[1] A. Präkelt et al.: Appl. Phys. Lett. 87(12), 121113 (2005)

[2] M. C. Fischer et al.: Opt. Lett. 30(12), 1551(2005)