Abstract
Abstract Due to its high sensitivity and high response speed advantages, four-quadrant detector has been widely used in areas such as atmospheric laser communication. Based on the analysis of the detector operating principle, this article sets up the error signal processing model of the Gaussian spot and analyses the relationship between spots conditions of different radius and position offsets, achieving the result that as the light spot radius is getting smaller, the slope of the output voltage curve on both sides at the origin is getting greater, and vice versa, and that when the spot radius is greater than 0.5R, the voltage (current) output amplitude will decreases as the spot radius increases. This paper also concludes that the spots radius should be 0.5R~0.8R in optical design on the basis of effective measuring range concept.
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