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15 March 2016 Characterization of type-II spontaneous parametric down-conversion in domain-engineered PPLN
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We characterize spontaneous parametric downconversion in a domain-engineered, type-II periodically poled lithium niobate (PPLN) crystal using seeded emission and single-photon techniques. Using continuous-wave (CW) pumping at 775 nm wavelength, the signal and idler are at 1532.5 nm and 1567.5 nm, respectively. The domain-engineered crystal simultaneously phasematches signal and idler pairs: [H(1532.5 nm), V(1567.5 nm)] and [V(1532.5 nm), H(1567.5 nm)]. We observe the tuning curves of these processes through difference-frequency generation and through CW fiberassisted, single-photon spectroscopy. These measurements indicate good matching in amplitude and bandwidth of the two processes and that the crystal can in principle be used effectively to generate polarization-entangled photon pairs.
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Paulina S. Kuo, Thomas Gerrits, Varun Verma, Sae Woo Nam, Oliver Slattery, Lijun Ma, and Xiao Tang "Characterization of type-II spontaneous parametric down-conversion in domain-engineered PPLN", Proc. SPIE 9762, Advances in Photonics of Quantum Computing, Memory, and Communication IX, 976211 (15 March 2016);

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