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, and optical system and optical apparatus provided with the same

Takehiko Nakai

- 12 Jun 2003

TL;DR: In this article, a diffractive optical element of the blazed-binary grating type is disclosed, with which a high diffraction efficiency can be achieved over substantially the entire used wavelength region.

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54

Patent

Optical system having a diffractive optical element, and optical apparatus

Hideki Ogawa

- 30 May 2002

TL;DR: The sign of the curvature of a lens surface having the diffraction grating provided thereon is the same as the sign of a focal length, at a design wavelength, of a system composed of, in the optical system, a surface disposed nearest to an object side to a surface disposing immediately before the lens surface, having the diffuse optical element providing thereon as mentioned in this paper.

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53

Patent

Diffractive optical element

Kenzaburo Suzuki, +1 more

- 08 Feb 2006

TL;DR: In this paper, a diffractive optical element is constituted by sandwiching and closely bonding first and second optical element components 13, 14 which have different refractive indices and are adhered via a relief pattern 20.

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49

Journal Article•10.1364/AO.46.007850

Design of a panoramic annular lens with a long focal length.

Shuang Niu, +3 more

- 10 Nov 2007

- Applied Optics

TL;DR: A new method to improve the design of the panoramic annular lens (PAL) optical system with long focus is introduced and a multilayer diffractive optical element (MDOE) is used in relay optics to simplify the structure of the system and to increase diffractive efficiency of the design spectral range.

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37

Patent

Diffraction optical element

Takehiko Nakai

- 27 Jul 2000

TL;DR: In this paper, a diffraction optical element with a plurality of diffraction gratings and the maximum difference of length among optical paths of light passing through the plurality of gratins is integer multiples of a plurality-of- wavelengths is described.

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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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