Bright, single-spatial-mode source of frequency non-degenerate, polarization-entangled photon pairs using periodically poled KTP





Citation of Original Publication

Pelton, Matthew, Philip Marsden, Daniel Ljunggren, Maria Tengner, Anders Karlsson, Anna Fragemann, Carlota Canalias, and Fredrik Laurell. “Bright, Single-Spatial-Mode Source of Frequency Non-Degenerate, Polarization-Entangled Photon Pairs Using Periodically Poled KTP.” Optics Express 12, no. 15 (July 26, 2004): 3573–80.


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We use two perpendicular crystals of periodically-poled KTP to directly generate polarization-entangled photon pairs, the majority of which are emitted into a single Gaussian spatial mode. The signal and idler photons have wavelengths of 810 nm and 1550 nm, respectively, and the photon-pair generation rate is 1.2×10⁷ sec⁻¹ for a pump power of 62 mW. The apparatus is compact, flexible, and easily to use.