Dresden 2014 – wissenschaftliches Programm

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O: Fachverband Oberflächenphysik

O 37: Posters: Plasmonics, Electronic Structure and Spin-Orbit Interaction, Semiconductor and Insulator Surfaces, Nanostructures

O 37.37: Poster

Dienstag, 1. April 2014, 18:30–22:00, P2

Implementation of Pulse Shaping in an Ultrafast confocal microscope — •Kevin Donkers, Alberto Comin, Richard Ciesielski, and Achim Hartschuh — Ludwig Maximilians Universität München & CeNS

The area of ultrafast spectroscopy has been of interest for many years yet its application to microscopy has been hindered by the difficulty of focusing femtosecond laser pulses. The use of high numerical aperture objectives with such short, broadband pulses leads to the introduction of very large values of Group Delay Dispersion (GDD), as well as higher order derivatives of the phase, which can elongate a laser pulse from less than ten femtoseconds to several picoseconds.

We implemented a pulse shaping scheme using a Liquid Crystal Modulator (LCM) and Prism Compressor in a microscopy setup with NA=1.3 allowing us to control the phase and amplitude of a strongly focused ultrafast pulse. We first used Multiphoton Intrapulse Interference Phase Scans (MIIPS) to recover laser pulses close to their original pulse length. We then have developed an advanced scheme to improve this further and demonstrate the compensation of linear chirp introduced by glass, the effect on non-linear photoluminescence of graphene and the increase of second-harmonic generation on beta-barium borate.