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Temporal cloaks have inspired the innovation of research on security andefficiency of quantum and fiber communications for concealing temporal events.The existing temporal cloaking approaches possessing ps ~ns cloaking windowsemployed the third-order nonlinearity mostly. Here we explore a temporal cloakfor perpetually concealing pulse events using high efficiency second-ordernonlinearity. A temporal pulse event was cloaked as a continuous wave withconstant intensity and restored by polarization dependent sum frequencygeneration processes between the continuous wave and probe. The variety ofquasi phase-matching second-order nonlinear processes in periodically poledlithium niobate make sure the pulse event cannot be filched duringtransmission. The proposed temporal cloak predicts hopeful applications ininformation security of photonic integrated circuit on lithium niobite thinfilm.

Arbitrary access temporal pulse cloaking and restoring in periodically poled lithium niobate