A single poling period in a TFLN waveguide is predicted to support two type-II SPDC processes: 710 nm to 1310+1550 nm and 775 nm to 1567+1533 nm, with the latter giving spectrally pure photon pairs.
Journal of Physics B: Atomic, Molecular and Optical Physics 57(15), 155501 (2024)
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Singly poled thin film lithium niobate waveguide as a tunable source of photon pairs across telecom band
A single poling period in a TFLN waveguide is predicted to support two type-II SPDC processes: 710 nm to 1310+1550 nm and 775 nm to 1567+1533 nm, with the latter giving spectrally pure photon pairs.