Hamburg 2009 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 55: Poster III
Q 55.39: Poster
Donnerstag, 5. März 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)