Apparatus and methods for generating multiple exit-pupil...

Details Apparatus and methods for generating multiple exit-pupil... Apparatus and methods for generating multiple exit-pupil...

2006-11-07

2006-11-07

Boutsikaris, Leonidas (Department: 2872)

Optical: systems and elements

Diffraction

From grating

C359S563000

Reexamination Certificate

active

07133204

ABSTRACT:
A diffraction grating generates even-order, odd-order, and 0th-order exit-pupil images. The even-order exit-pupil images have brightness levels within a first range and the odd-order exit-pupil images have brightness levels within a second range that is different from the first range. In one example, the even-order exit-pupil images are virtually invisible, i.e., missing, the odd-order exit-pupil images have the same or approximately the same intensities, and the 0th-order exit-pupil image has an intensity greater than the respective intensities of the odd-order exit-pupil images.

REFERENCES:
patent: 5029243 (1991-07-01), Dammann et al.
patent: 5113286 (1992-05-01), Morrison
patent: 5513025 (1996-04-01), Watanabe et al.

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