  Cavity nonlinear optics enables intriguing physical phenomena to occur at
micro- or nano-scales with modest input powers. While this enhances
capabilities in applications such as comb generation, frequency conversion and
quantum optics, undesired nonlinear effects including photorefraction and
thermal bistability are exacerbated. In this letter, we propose and demonstrate
a highly effective method of achieving cavity stabilization using an auxiliary
laser for controlling photorefraction in a z-cut periodically poled lithium
niobate (LN) microcavity system. Our numerical study accurately models the
photorefractive effect under high input powers, guiding future analyses and
development of LN microcavity systems.
