  We theoretically propose a temporal cloaking scheme based on accelerating
wave packets. A part of a monochromatic lightwave is endowed with a
discontinuous nonlinear frequency chirp, so that two opposite accelerating
caustics are created in space-time as the different frequency components
propagate in the presence of dispersion. The light intensity in the interior of
this biconvex time gap is negligible, thus concealing the enclosed events. In
contrast to previous temporal cloaking schemes, where light propagates
successively through two different media with opposite dispersions,
accelerating wave packets open and close the cloaked time window continuously
in a single dispersive medium. In addition, biconvex time gaps can be tailored
into arbitrary shapes and offer a larger suppression of intensity compared to
their rhombic counterparts.

Optics