  Based on the time-convolutionless master-equation approach, we investigate
squeezing of light field in a dissipative Jaynes-Cummings model. The results
show that squeezing light can be generated when the atom transits to a ground
state from an excited state, and then a collapse-revival phenomenon will occur
in the squeezing of light field due to atom-cavity coupling. Enhancing the
atom-cavity coupling can increase the frequency of the collapse-revival of
squeezing. The stronger the non-Markovian effect is, the more obvious the
collapse-revival phenomenon is. The oscillatory frequency of the squeezing is
dependents on the resonant frequency of the atom-cavity.
