SPATIAL COHERENCE ENHANCEMENT THROUGH SOURCE MASKING : SPECTRAL MODIFICATIONS INTRODUCED BY THE MASK

We report spectral modifications introduced by uniformly redundant array (URA) when it is used as a source mask to ehance spatial coherence of a partially coherent light source on propagation. In the far field the URA introduces increasing spectral broadening and shift as the source correlation l is varied from 300 to 600 um. How- over, spectral broadening in the far field did not follow any set pattern to prove a reciprocity relation between the enhancement of spartial coherence and decrease in temporal coherence.