Time and frequency features of noise for a pulsed squeezed state field generated via degenerate four wave mixing

The time and frequency features of the fluctuations are studied for a pulsed squeezed state field generated by train of pulses produced by a mode-locked laser via degenerated four wave mixing. We propose an improved balanced homodyne detection scheme, which can be used to measure simultaneously the time variation and the frequency spectrum of the noise of in one quadrature component of the pulsed squeezed state field. The explicit expressions for the intensity and the noise as functions of time and frequency are derived. The features of the intensity and noise spectra are discussed. It is shown that the variation of noise with time exhibits a pulse train with reduced noise and the frequency spectrum of the noise displays some very interesting properties.