Buffer excitation of squeezed light

The main features of squeezed light are described. Specifically, we reveal that the evolution of the squeezed light excited in the degenerate regime of parametric oscillation considerably differs from that of the light excited in the nondegenerate regime. It is demonstrated that in the nondegenerate regime (which is the actual regime of parametric oscillation) the minimum variance of the quantum state decreases only at the initial stage of excitation; afterwards the minimum variance starts to rise (as the maximum variance), thus obstructing the increase in the squeezing coefficient. The difference between the excitation regime of a typical laser and that of a parametric oscillator is discussed. We show that in a parametric oscillator the competition between central and side frequencies of the cavity spectrum is practically absent due to the smallness of nonlinearity factor, and, as a consequence, the width of the generated spectrum line does not narrow. In order to increase the competition between the frequency components, a buffer regime of the parametricoscillating excitation is suggested. With the help of numerical simulations we show that this competition is really increased in the buffer regime. (© 2005 by Astro, Ltd. Published exclusively by WILEY‐VCH Verlag GmbH & Co. KGaA)