Dresden 2011 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 36: Poster Session II (Metals; Nanostructures at surfaces; Surface or interface magnetism; Spin-Orbit Interaction at Surfaces; Electron and spin dynamics; Surface dynamics; Methods; Theory and computation of electronic structure)
O 36.106: Poster
Dienstag, 15. März 2011, 18:30–22:00, P4
Generation, characterization and compression of pJ white-light-continuum pulses for ultrafast spectroscopy — •Daniel Wegkamp1, Simon Wall1, Daniele Brida2, Stefano Bonora2, Giulio Cerullo2, Julia Stähler1, and Martin Wolf1 — 1Fritz-Haber-Institute of the MPG, Dep. of Physical Chemistry, Berlin, Germany — 2Politecnico di Milano, Dipartimento di Fisica, Milan, Italy
Broadband white-light-continuum pulses are widely used as a probe for optical spectroscopies, providing a probing bandwidth of several hundred nanometers in the UV, visible and IR. However, their use in ultrafast spectroscopy is limited due to the long duration of the pulses. In addition, pulse diagnostics are difficult because of their low power. We report the measurement of the group-delay of such white-light pulses with sub-nJ pulse energy. Furthermore we describe the setup and application of a deformable mirror-based compressor resulting in optimized temporal shapes of the pulses. White-light pulses are generated by self-phase modulation due to focusing of 40 fs laser pulses (800nm, provided by a 300 kHz Ti:Sa regenerative amplifier system) into a YAG crystal. The resulting pulses have durations of several hundred femtoseconds and contain spectral components ranging from near-UV to the IR. These are characterized by spectrally resolved measurement of the transient reflectivity. Compression of the pulses is achieved by adjustment of the extracted group delays [1] using the deformable mirror.
[1] Parmigiani et al. Appl. Phys. Lett. 96 (2010) 021102