Abstract

Recently we analyzed an optical-phase feed-forward scheme to produce a squeezed-light beam from the twin beams generated by nondegenerate optical parametric amplification.¹ Our interest in this scheme stems from the possibility it allows for the generation of tunable squeezed light. If the input signal beam to the parametric amplifier is tunable, a tunable squeezed output beam can be obtained for spectroscopic applications.² In this paper we present a wideband model of this scheme. Noise characteristics of the homodyne detector, that measures squeezing properties of the phase-controlled output signal beam from the parametric amplifier, are analyzed in detail. To minimize the squeezed-noise power at an arbitrarily given sideband frequency, the optimal phase feed-forward transfer function is calculated. This feed-forward transfer function is achievable with a bandpass filter and an electronic amplifier. For certain frequency profiles of the gain and phase of the parametric amplifier, the squeezed-noise power spectral density can be minimized over the whole electronic bandwidth of the photodetector that is employed in homodyne detection.

© 1991 Optical Society of America