Patent
Contacted multilayer diffractive optical element
Kazunori Komori
- 24 Oct 2016
TL;DR: In this paper, a contacted multilayer diffractive optical element consisting of a first chalcogenide glass material and a second layer consisting of an intermediate chalgogenide material, satisfying a predetermined conditional expression, is presented.
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Abstract: A contacted multilayer diffractive optical element having reduced wavelength dependency of diffraction efficiency, the contacted multilayer diffractive optical element facilitating processing in manufacture and being suitable for an infrared optical system, and an infrared optical system and an image pickup apparatus using the diffractive optical element. In order to achieve the above object, a contacted multilayer diffractive optical element comprises a first layer consisting of a first chalcogenide glass material and a second layer consisting of a second chalcogenide glass material, the first chalcogenide glass material and the second chalcogenide glass material satisfying a predetermined conditional expression and being in contact with and stacked on each other, and a diffraction grating structure in a surface of the contact therebetween, and an infrared optical system and an image pickup apparatus comprising the contacted multilayer diffractive optical element are provided.
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References
Patent
Diffractive optical element
Hiroyuki Ishii
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TL;DR: A diffractive optical element has a plurality of step-like patterns each having surface levels of a number less than eight, the steplike patterns being disposed in combination to provide a function of a steplike structure of eight or more levels.
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Toru Nakamura,Akiko Miyakawa +1 more
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TL;DR: An optical element comprising a first member and a second member tightly bonded thereto and satisfying nd1>nd2 and (nF1-nC1) 0.003 with a second resin precursor which in an uncured state satisfies nd 0.010 as discussed by the authors.
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Patent
Diffractive optical element, optical system, and optical apparatus
Reona Ushigome
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TL;DR: A diffractive optical element includes a first diffraction and a second diffraction grating which are made of materials different from each other and are stacked in an optical axis direction.
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Patent
Objective optical system, optical pickup apparatus and optical disk drive apparatus
Tohru Kimura,Nobuyoshi Mori,Yuichi Atarashi,Kiyono Ikenaka +3 more
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TL;DR: In this article, an objective optical system for use in an optical pickup apparatus which reproduces and/or records information on an information recording surface of first-third optical disks is described.
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Patent
Diffractive optical element and image pickup optical system
Hidemi Takayama
- 28 Oct 2011
TL;DR: In this paper, a diffractive optical element that is used for an optical system includes a first diffraction grating and a second diffraction wall, and the diffractive surface has a shape in which an inclination of the grating surface of a diffraction having the greater refractive index distribution is decreased and a height of the wall surface is lowered with respect to a shape of a base surface that forms one of the diffraction gratings.
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