Abstract

A novel twin Bragg cell, space-integrating correlator is described, in which the spatial integration is achieved by summing the light intensity on a photodiode. It is found that the nature of the output depends on the type of amplitude modulation used to apply the signals to the Bragg cell carrier frequency. With suppressed carrier modulation the correlation of the squares of the input signals is obtained but when large carrier modulation is used the true correlation of the signals may be obtained by high pass filtering the detector output. It is shown that the phase of the correlation function is preserved.

© 1989 Optical Society of America