Broadband diffractive lens or imaging element

Details Broadband diffractive lens or imaging element Broadband diffractive lens or imaging element

1990-09-25

1991-12-10

Arnold, Bruce Y.

Optical: systems and elements

Holographic system or element

Using a hologram as an optical element

2505051, 351160R, 623 6, 359565, 359571, 359558, G02B 2744

Patent

active

050712071

ABSTRACT:
A broadband diffractive lens or imaging element produces a sharp focus and/or a high resolution image with broad bandwidth illuminating radiation. The diffractive lens is sectored or segmented into regions, each of which focuses or images a distinct narrowband of radiation but all of which have a common focal length. Alternatively, a serial stack of minus filters, each with a diffraction pattern which focuses or images a distinct narrowband of radiation but all of which have a common focal length, is used. The two approaches can be combined. Multifocal broadband diffractive elements can also be formed.

REFERENCES:
patent: 3309162 (1967-03-01), Kosanke et al.
patent: 3402001 (1968-09-01), Fleisher
patent: 3759604 (1973-09-01), Thelen
patent: 4132654 (1979-01-01), Braun
patent: 4637697 (1987-01-01), Freeman

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