Optical: systems and elements – Diffraction – From grating
Patent
1995-09-07
1998-12-08
Henry, Jon W.
Optical: systems and elements
Diffraction
From grating
359574, 359576, G02B 518, G02B 2744
Patent
active
058478779
ABSTRACT:
A diffractive optical element including a first layer made of a first optical material having high refractive index and low dispersion, and a second layer made of a second optical material having low refractive index and high dispersion. The first and second layers are stacked together. The outer surfaces of the first and second layers are substantially smooth, while the connecting surfaces of the first and second layers are substantially contoured to follow a relief pattern. To satisfy a preferred operating wavelength range of 400 nm to 700 nm, a glass selected from the group consisting of BSM7, BSM81, BSL7, BAL5, BAL50, BAL22, LAL11, LAL12, LAL18, YGH51, LAH57 and LAH75 may be used as the first optical material, and a silicate glass containing certain amounts (e.g., 2 to 25 mol %) of Tl.sub.2 O may be used as the second optical material.
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patent: 5457573 (1995-10-01), Iida et al.
Malacara, et al., "Handbook of Lens Design," New York: Marcel Dekker, Inc., 1994, pp. 633-636, 638 and 639.
G.J. Swanson, "Binary Optics Technology: The Theory and Design of Multi-Level Diffractive Optical Elements", Massachusetts Institute of Technology, Lincoln Laboratory, Technical Report 854, Aug. 14, 1989, pp. 1-47.
Imamura Ayami
Ishii Tetsuya
Henry Jon W.
Olympus Optical Co,. Ltd.
Robinson Mark A.
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