Article

Speckle reduction using orthogonal arrays in laser projectors.

Institute for Microsystems Technology, Vestfold University College, Tonsberg N-3103, Norway.
Applied Optics (impact factor: 1.41). 11/2010; 49(33):6425-9. pp.6425-9
Source: PubMed

ABSTRACT We propose using a two-level (-1 and +1 as variables) orthogonal array (OA) to generate a binary phase diffuser for speckle reduction in laser projection displays. Compared with the Hadamard matrix, the diffuser generated from OA is more flexible. The speckle contrast ratio (CR) when introducing the binary phase diffuser at an intermediate image plane within the projector is calculated, and the minimum speckle CR can be achieved by finite step change of the diffuser patterns. With Kronecker algebra, the two-dimensional diffuser can also be replaced by two one-dimensional diffusers with the same function, and it can be implemented into the laser projector electronically and easily.

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Keywords

binary phase diffuser
 
CR
 
diffuser
 
diffuser patterns
 
finite step change
 
flexible
 
Hadamard matrix
 
intermediate image plane
 
Kronecker algebra
 
minimum speckle CR
 
one-dimensional diffusers
 
speckle contrast ratio
 
speckle reduction
 
two-dimensional diffuser