Hannover 2010 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 21: Poster I

Q 21.59: Poster

Dienstag, 9. März 2010, 16:00–19:00, Lichthof

Biphoton source at 710nm using a periodically poled MgO doped stoichiometric lithium tantalate crystal — •Sebastian Wander, Dirk Puhlmann, and Martin Ostermeyer — Institute for Physics and Astronomy, University of Potsdam, Karl-Liebknecht-Str 24/25, 14476 Potsdam, Germany

Correlations between photons are interesting for a number of applications and concepts in metrology, in particular for resolution improvements in different methods of quantum imaging. As used in most experiments of quantum imaging the most efficient single photon detectors, silicon avalanche photo detectors, have a sensitivity maximum around 700nm. To generate correlated photons in this wavelength region efficiently, special nonlinear optical materials are needed for this purpose. Periodically poled MgO doped Lithium Tantalate (PP-MgO:SLT) is an attractive nonlinear material because of its high nonlinear coefficients , its high resistance to optical damage and its wide optical transparency down to the UV spectral range [1]. In this paper we present a source for biphotons based on PP-MgO:SLT. The nonlinear crystal is pumped by the third harmonic of a Nd:YAG laser emitting 11ps long pulses. The generated biphotons have a central wavelength of 710nm. To characterize the correlations of the biphotons different methods are applied. Diffraction at a blazed grating [2] offers information about the spatial degree of correlation of the photons.

[1] A. Bruner et al, Optics Letters 28, 194 (2003)

[2] M. Ostermeyer, D. Puhlmann, D. Korn, JOSA-B 26, 2347 (2009)