Diffractive optical element

Patent

Diffractive optical element

- 18 Jan 2000

105

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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Citations

Patent

Diffractive optical element, optical system, and optical apparatus

Reona Ushigome

- 10 Jun 2011

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.

...read moreread less

26

Patent

Zoom lens device and optical apparatus provided with the same

Hiroki Nakayama, +2 more

- 19 Oct 1999

TL;DR: In this article, a zoom lens device including a diffraction optical element constructed in a new way is described, where at least one of the lens units from the third lens unit onwards is moved in order to correct a change in an image plane which occurs as the magnification changes.

...read moreread less

26

Patent

Diffractive optical element and method for manufacturing same

Yoshifumi Tokoyoda

- 10 Aug 2006

TL;DR: In this paper, the optimum designed value of groove heights of a diffractive optical element is determined so as to satisfy a condition for correcting chromatic aberration at both d-line and g-line.

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25

Patent

Diffraction optical element

Kenzaburo Suzuki, +3 more

- 04 Oct 2002

TL;DR: In this paper, a multi-ply diffraction optical element which has improved angular characteristic is provided, and a diffraction grating groove is formed on the combined surface between both of the diffraction element parts.

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24

Patent

Hybrid achromatic optical lens and method for manufacturing the same

Cho Eun Hyeong, +2 more

- 03 Jun 2003

TL;DR: In this paper, a hybrid achromatic optical lens with a high numerical aperture whose chromatic aberration is removed and a method for manufacturing the same are provided, which includes forming a profile of a diffractive surface having a plurality of pitches on a molding die, forming a depression having the diffractive surfaces on a first optical member, and coating a material having a high index of refraction on the depression.

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References

Patent

Diffractive optical elements as combiners

W. Hudson Welch

- 07 Jun 1995

TL;DR: In this article, a combiner for combining light traveling on two optical paths to permit coincident viewing of the light includes a light-transmissive substrate having first and second surfaces, the first surface having a first diffractive structure that is a computer-generated hologram formed thereon configured to correct aberrations in light travelling on the first optical path which may be incident on the second surface and a partially reflective coating on the 1D structure.

...read moreread less

51

Patent

Dual diffraction grating beam splitter

Mool C. Gupta

- 01 Jun 1992

TL;DR: A dual diffraction grating as discussed by the authors comprises first and second light diffracting surfaces of identical pitch and depth, wherein the diffraction grooves of the first and the second diffraction surfaces are angularly oriented with respect to one another.

...read moreread less

27

Patent

Achromatic optical system including diffractive optical element, and method of forming same

Michael R. Feldman, +3 more

- 06 Jun 1995

TL;DR: In this article, a method of forming an achromatic diffractive optical element is also provided, which includes the steps of determining a first data set comprising a plurality of discrete phase values and discrete transition values and selecting from the first data sets phase value and transition values to form a second data set for defining first and second holograms.

...read moreread less

26

Patent

Birefringent grating polarizing beam splitter

Yansong Chen, +3 more

- 30 Aug 1996

TL;DR: In this paper, a birefringence polarizing beam-splitter with a series of periodic blazed grooves or grooves with echelon profile having a number of steps is provided on the surface of an optically bire-fringent material.

...read moreread less

22

Patent

Optical head having a grating with a doubly periodic structure

Mool C. Gupta, +1 more

- 26 Jun 1991

TL;DR: In this paper, an optical head is disclosed in which a beam from a diode laser is directed onto an optical disc, and a beam reflected from the optical disc is passed through an optical device which forms a plurality of discrete beams of different orders.

...read moreread less

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