Abstract

Predetection mixing of the intensity modulation on optical beams is shown to have performance advantages in certain laser radar applications. The method allows detection of signals with high frequency intensity modulation using a low frequency sensor. The method can lead to a signal-to-noise ratio improvement compared to a system using a high frequency sensor. The technique is demonstrated by using a sensor with a 5-kHz cutoff frequency to receive a laser beam intensity modulated at 4 MHz.

© 1988 Optical Society of America

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