Optical: systems and elements – Diffraction – From grating
Patent
1996-11-22
1998-09-08
Font, Frank G.
Optical: systems and elements
Diffraction
From grating
359629, 359837, G02B 518
Patent
active
058053409
ABSTRACT:
An optical modulator (19) utilizes a variable beam splitter arrangement having two separate plano-periodic cylindrical lens arrays (20 and 22) arranged as a sandwiched air-spaced assembly with the plano surfaces facing outwardly from the assembly. The assembly further includes a means (26) for controllably translating or moving one of the lenses relative to the other. The periodic array is formed as alternating concave and convex cylindrical structures. In a nominal setting, the optical axes of the concave structures of one of the lens arrays are aligned with the optical axes of the convex structures of the other so that the assembly acts as an afocal window having little impact when placed in an optical system. To adjust the beam splitting properties, one lens array is slightly translated with respect to the other to cause controlled misalignment of the two lens array surfaces. The present invention is particularly suited for tuning the point spread function of an electronic imaging system.
REFERENCES:
patent: 2189751 (1940-02-01), Bocca et al.
patent: 5054884 (1991-10-01), Kubota
patent: 5337181 (1994-08-01), Kelly
patent: 5442787 (1995-08-01), Steiner
Font Frank G.
Kelly Shawn L.
Ratliff Reginald A.
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