15 March 2016 Characterization of type-II spontaneous parametric down-conversion in domain-engineered PPLN
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Abstract
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, Paulina S. Kuo, Thomas Gerrits, Thomas Gerrits, Varun Verma, Varun Verma, Sae Woo Nam, Sae Woo Nam, Oliver Slattery, Oliver Slattery, Lijun Ma, Lijun Ma, Xiao Tang, 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); doi: 10.1117/12.2218535; https://doi.org/10.1117/12.2218535
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