Optimal detection of partially spatial coherent radiation by using optical quantum amplifiers

Conditions for the efficient detection of reflected laser radiation by means of optical quantum amplifiers are considered theoretically. It is shown that in the case of a strongly disturbed spatial coherence, there is no need to take it into account and a simple geometrical consideration is sufficient. The expressions relating the effective radius of the input aperture and the angular magnification of a projecting optical system with the laser radiation divergence and amplifier parameters are obtained. The theoretical results are confirmed by experiments.