Biperiodically Poled Lithium Niobate Microcavities for Multiple Nonlinear Optical Processes

We fabricated periodically poled lithium niobate microdisks with a 1.43×105 quality factor and a double-period domain pattern, where multiple nonlinear optical wavelength conversion processes were obtained, including SHG with a 5.1×10−4 mW−1 normalized conversion efficiency.