Regensburg 2013 – scientific programme

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DF: Fachverband Dielektrische Festkörper

DF 19: Poster 2

DF 19.14: Poster

Wednesday, March 13, 2013, 15:00–17:30, Poster B2

Ultrafast holographic spectroscopy — •Andreas Buescher, Kay-Michael Voit, Hauke Bruening, Holger Badorreck, and Mirco Imlau — School of Physics, Osnabrueck University, Germany

A novel experimental approach for the study of small-polaron-related changes of the complex permittivity in lithium niobate is presented. Our approach is based on holographic spectroscopy [K. Voit and M. Imlau, Materials (2013)] that has been established as an important tool for the analysis of light-induced changes of the complex dielectric permittivity at optical frequencies. The study of dispersive permittivity features in lithium niobate is driven by our recent discovery of efficient small-polaron based hologram recording with single laser pulses [H. Bruening et al., Opt. Express 20, 13326 (2012)]. In order to study the underlying mechanisms, holographic spectroscopy must be extended to a dynamic tool with temporal resolution of the small polaron formation time (≈ 100 fs). We have addressed this demand by the design of a novel type of nonlinear optical setup that includes holographic techniques, a broad-band probing light source by means of supercontinuum generation as well as a classical pump-probe setup equipped with an optical delay line for sub-ps temporal resolution. The concept is verified experimentally using Fe-doped lithium niobate.
Financial support by the Deutsche Forschungsgemeinschaft (IM 37/5, INST190/137-1) is gratefully acknowledged.