Nonlinear optical materials convert incident lights to photonic signals of higher frequencies. For ultra-sensitive photon counting devices, such as SNSPD (Superconductor Nanowire Single Photon Detector), or Superconductor tunnel junction photon counters, it is essential to understand the nonlinear optical properties of related superconductor metal oxides and nitrides. In this report, we present nonlinear spectral analysis for various superconductor oxides (LiNbO3, Nb2O5, Ta2O5), other metal oxides (Al2O3, WO3), and Niobium Nitride (NbN), in the UV, visible, and near infrared regions.
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