Abstract
We demonstrate simultaneous type-0 and type-II spontaneous parametric down-conversions (SPDCs) in a single periodically poled KTiOPO4 (KTP) crystal with a domain-inversion period of 10.00 μm. When a 45° linearly polarized 405 nm pump laser was injected into the crystal, the type-0 and the type-II SPDCs were simultaneously obtained using the third-order quasiphase matching (QPM) with the d33 and the first-order QPM with the d24 of KTP, respectively. We observed ring images due to the noncollinear propagation of the signals satisfying the three-dimensional type-0 and type-II QPM conditions, respectively. The observed results were in agreement with the calculated results based on the Sellmeier’s formulas.
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