A rubidium-doped KTP waveguide generates both type-0 and type-II SPDC photon pairs with distinct spectra and rates, using third-order and first-order quasi-phase matching.
Simultaneous type-I and type-II phase matching for second-order nonlinearity in integrated lithium niobate waveguide,
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Rubidium-Doped KTiOPO$_4$ Waveguides as a Dual-Type Photon Pair Source
A rubidium-doped KTP waveguide generates both type-0 and type-II SPDC photon pairs with distinct spectra and rates, using third-order and first-order quasi-phase matching.