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Passive depolariser

A passive depolarizer, depolarizer technology, used in instruments, polarizing components, scientific instruments, etc.

Inactive Publication Date: 2008-02-27
JDS UNIPHASE CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Patterned waveplates with spatially varying fast-axis orientations have been described in the prior art, but none of the disclosed devices are depolarizers

Method used

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Examples

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Embodiment Construction

[0021] Referring to FIG. 1 , the present invention provides a depolarizer including a patterned half-wave plate 100 . Patterned half-wave plate 100 has an entrance surface 110 and an exit surface 120 and includes a monolithic layer 130 of birefringent material. Preferably, the patterned half-wave plate 100 may consist of a single layer of birefringent material 130 , or may also include an optional photo-alignment layer 140 , which may be adjacent to the entrance surface 110 or the exit surface 120 .

[0022] As described above, the ideal thickness d of the patterned half-wave plate 100 can be determined according to the average wavelength λ of the incident light beam 150 and the birefringence Δn of the birefringent material of the monolithic layer 130 . The incident light beam 150 may be linearly polarized or elliptically polarized, and preferably has an average wavelength of approximately 400-2000 nm. Preferably, the birefringence of the birefringent material is about 0.05-0...

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Abstract

The present invention relates to a passive depolarizer in an optical system having an image plane. The passive depolarizer includes a patterned half wave plate incorporating a monolithic layer of birefringent material. The monolithic layer includes a plurality of regions having fast axes with at least four different orientations. Accordingly, a polarized beam of light incident into the patterned half wave plate is substantially depolarized at the image plane.

Description

technical field [0001] The present invention generally relates to a depolarizer and patterned wave plate. More particularly, the present invention relates to a passive depolarizer comprising a patterned half-wave plate. Background technique [0002] Many optical components are sensitive to the polarization of light. When such optical elements are used in optical systems, their polarization sensitivity introduces significant errors. To counteract the undesirable polarization sensitivity effects, depolarizers can be used to reduce or attempt to randomize the polarization of light. [0003] For example, typical diffraction gratings used in spectrometers are inherently polarization sensitive, that is, their diffraction efficiency depends on the polarization of light. When operating over a wide range of wavelengths, a spectrometer can utilize multiple different gratings, each with a different polarization sensitivity. If the incident light is polarized, the output of differen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G02B5/30
CPCG01J3/0224G02B5/3083
Inventor 斯科特·迈克尔东尼杰瑞·扎而巴迈克尔·纽厄尔
Owner JDS UNIPHASE CORP