Optical: systems and elements – Diffraction – From zone plate
Patent
1996-12-20
1998-10-27
Henry, Jon W.
Optical: systems and elements
Diffraction
From zone plate
359559, 359563, 359568, 359569, 430 5, 21912168, G02B 2724, G02B 2746, G02B 518, G03F 900
Patent
active
058284915
ABSTRACT:
An advanced design for a phase plate enables the distribution of spots in arbitrarily shaped patterns with very high uniformity and with a continuously or near-continuously varying phase pattern. A continuous phase pattern eliminates large phase jumps typically expected in a grating that provides arbitrary shapes. Large phase jumps increase scattered light outside of the desired pattern, reduce efficiency and can make the grating difficult to manufacture. When manufacturing capabilities preclude producing a fully continuous grating, the present design can be easily adapted to minimize manufacturing errors and maintain high efficiencies. This continuous grating is significantly more efficient than previously described Dammann gratings, offers much more flexibility in generating spot patterns and is easier to manufacture and replicate than a multi-level phase grating.
REFERENCES:
patent: 4933649 (1990-06-01), Swanson et al.
patent: 5062021 (1991-10-01), Ranjan et al.
patent: 5477383 (1995-12-01), Jain
patent: 5633735 (1997-05-01), Hunter et al.
Dane C. Brent
Dixit Shamasundar
Hackel Lloyd
Honig John
Neuman Bill
Chang Audrey
Henry Jon W.
The Regents of the University of California
Wooldridge John P.
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