Temporal cloaks have inspired the innovation of research on security and efficiency of quantum and fiber communications for concealing temporal events. The existing temporal cloaking approaches possessing ps ~ns cloaking windows employed the third-order nonlinearity mostly. Here we explore a temporal cloak for perpetually concealing pulse events using high efficiency second-order nonlinearity. A temporal pulse event was cloaked as a continuous wave with constant intensity and restored by polarization dependent sum frequency generation processes between the continuous wave and probe. The variety of quasi phase-matching second-order nonlinear processes in periodically poled lithium niobate make sure the pulse event cannot be filched during transmission. The proposed temporal cloak predicts hopeful applications in information security of photonic integrated circuit on lithium niobite thin film.
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