Stuttgart 2012 – wissenschaftliches Programm

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Q: Fachverband Quantenoptik und Photonik

Q 54: Poster 3

Q 54.79: Poster

Donnerstag, 15. März 2012, 16:30–19:00, Poster.I+II

Characterization of a SPDC biphoton source pumped with high power cw-laser — •Henning Kurzke, Michael Seefeldt, Axel Heuer, and Ralf Menzel — Universität Potsdam, Institut für Physik und Astronomie, Photonik, Karl-Liebknecht-Str. 24-25, Haus 28, 14476 Potsdam

Today, entangled photons (biphotons) are mostly generated via Spontaneous Parametric Down-Conversion (SPDC). Biphoton rates up to the μW range were reported [1]. These biphotons are applied in a wide range of science and technology. The applications range from fundamental experiments proving basic concepts of quantum mechanics up to quantum spectroscopy and cryptography. Nevertheless, the weak intensity of such biphoton sources prevent further applications. Therefore we tried to increase the biphoton rate by using high cw-pump power up to 10 W. The 4 mm long NLO crystal consists of MgO doped Lithium Niobate (PPLN) with 5 periodically poled gratings. Each grating had a individual grating period. Results, characterizing the SPDC light, will reported.

[1] A. Jechow, A. Heuer, R. Menzel, Opt. Express, Vol. 16(17), 2008