Interference effects during information playback using partially coherent radiation

Lapchuk A.S., Yurlov V.I., Shilo S.O., Shyhovtsya O.V.

An optical scheme for speckle suppression using two and three partially coherent beams in a laser projection system is proposed. An algorithm is developed for calculation of speckle contrast ratio for the proposed method. It is shown that for a small decorrelation length with using the same thickness of the transparent plates two partially coherent beams would provide better speckle suppression than three beams optical scheme. However, for a large decorrelation length, the three beam setup provides better speckle suppression for all three laser of different colors with a suppression coefficient close to theoretical limits. The theoretical results are confirmed by experiment data.

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