Hamburg 2009 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 53: Ultrakurze Pulse: Anwendungen III

Q 53.2: Talk

Thursday, March 5, 2009, 16:45–17:00, VMP 6 HS-A

Controlling spectral hole intensities via self-phase modulation using tailored fs laser pulses — •Jens Köhler, Tillmann Kalas, Cristian Sarpe-Tudoran, Matthias Wollenhaupt, and Thomas Baumert — Universität Kassel, Institut für Physik und Center for Interdisciplinary Nanostructure Science and Technology (CINSaT), Heinrich-Plett-Str. 40, D-34132 Kassel, Germany

In previous experiments [1] we have removed a small interval of frequency components from the broad spectrum of an ultrashort laser pulse in order to study the refilling of the resulting spectral hole via self-phase modulation (SPM) as a function of the laser intensity. Recently, making use of femtosecond pulse shaping techniques we extended our studies by taking into account additional parameters like the magnitude of amplitude modulation and the spectral phase in the corresponding spectral range. By using the spectral phase as single control parameter holes with adjustable depth as well as an intensity overshoot in a narrow spectral band are observed. The optimization of the spectral hole generation and refilling process is discussed. Results on controlling the spectral hole intensities employing spectrally phase and/or amplitude modulated femtosecond laser pulses are presented. In addition, we suggest possible applications of these effects in the field of label-free nonlinear microscopy, such as the use as a new contrast mechanism for the investigation of transparent samples.
[1] A. Präkelt et al.: Appl. Phys. Lett. 87(12), 121113 (2005)