E. Tepichin et al., 2-D LAU PATTERNS - IN-REGISTER INCOHERENT JOINT SUPERPOSITION OF MONTGOMERY PATTERNS, Optics communications, 125(1-3), 1996, pp. 27-35
We describe an optical arrangement for obtaining simultaneously a 2-D
Lau pattern in each plane parallel to a Montgomery-type screen. Each o
ne of them appears as the in-register superposition of mutually incohe
rent replicas of a different Fresnel diffraction pattern produced by t
he object screen. The above joint superposition of Montgomery patterns
is achieved by means of an encoded linear incoherent source that lies
along the optical axis of the system. The radially symmetric version
of the preceding expansion of the Lau phenomenon is applied to visuali
ze, in an incoherent way, phase structures on a uniform background wit
h good contrast.