The condition for a diffuser to produce the maximum speckle contrast reduction with the minimum number of distinct phase patterns is derived. A binary realization of this optimum diffuser is obtained by mapping the rows or columns of a Hadamard matrix to the phase patterns. The method is experimentally verified in the Grating Light Valve laser projection display.
© 2004 Optical Society of America
Jahja I. Trisnadi, "Hadamard speckle contrast reduction," Opt. Lett. 29, 11-13 (2004)