Dresden 2014 – wissenschaftliches Programm

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DF: Fachverband Dielektrische Festkörper

DF 9: Poster Session DF

DF 9.7: Poster

Dienstag, 1. April 2014, 18:30–20:00, P1

Kerr gating efficiency of tellurite glasses as a function of their composition — •Christian Karras, Kay Schuster, Stephan Grimm, Wolfgang Paa, and Herbert Stafast — Institut für Photonische Technologien, Albert - Einstein - Straße 9, 07745 Jena

Tellurite glasses were announced to be a promising material for optical Kerr gating (OKG) [1]. We investigated the applicability of tellurite glasses as OKG switching material as function of its composition. Therefore we used a dual frequency Kerr gating setup where the material was pumped at 800 nm and the transient Kerr signal was observed at 530 nm. Four different composite tellurite glasses with varying ratios of TeO₂ and K₂O or ZnO were investigated with respect to the optimum gating efficiency, the optimum pump power, and the temporal resolution. Especially the gating efficiency strongly depended on the material composition. For materials with a high TeO₂ concentration gating efficiencies above 50% could be achieved at moderate pump intensities below 1 TW/cm². We compared the switching behavior of the tellurites glasses with other promising materials for OKG, such as fused silica, zinc sulfide and Schott SF56, a heavy flint glass. All tellurites showed superior behavior in terms of efficiency but had a significantly extended minimum gating time compared to fused silica. We considered dispersion to be a major reason for the latter effect. Therefore we applied an easy pulse propagation model in order to estimate the signal broadening due to dispersion.

[1] Z. Hang et al., Journal of Optics, 14(6), 065201 (2012).