Fresnel zone plate based on elastic materials

Optical: systems and elements – Diffraction – From grating

Reexamination Certificate

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C359S569000, C359S565000

Reexamination Certificate

active

07136227

ABSTRACT:
A dynamically variable, amplitude grating based diffractive optic including: a substantially transmissive, elastic substrate; a substantially opaque, elastic material formed in a predetermined pattern on the first surface of the elastic substrate; and a substrate mount coupled to the elastic substrate to hold it under tension. The predetermined pattern of the substantially opaque, elastic material substrate forms an amplitude grating on the elastic substrate. The substrate mount includes a variable tensioner to stretch the elastic substrate and the substantially opaque, elastic material, thereby allowing at least one optical property of the amplitude grating to be dynamically varied. Alternatively, the elastic substrate may include at least one substantially transparent portion and at least one substantially opaque portion, the substantially opaque portion(s) arranged in a predetermined pattern to form the amplitude grating within the elastic substrate rather than on its surface.

REFERENCES:
patent: 4909626 (1990-03-01), Purvis et al.
patent: 5360973 (1994-11-01), Webb
patent: 2003/0107789 (2003-06-01), Hishioka
patent: 2005/0117223 (2005-06-01), Bi
patent: 0 688 062 (2001-07-01), None
patent: 11027035 (1999-01-01), None
patent: WO 88/10521 (1988-12-01), None
patent: WO 90/07199 (1990-06-01), None

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