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Diffractive optical device and system

A technology of diffractive optical elements and optical elements, applied in the field of optical elements, can solve problems such as limited field of view

Inactive Publication Date: 2008-09-10
MIRAGE INNOVATIONS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the single optical channel employed by currently known devices, the field of view that can be obtained without distortion or loss of information is rather limited

Method used

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  • Diffractive optical device and system

Examples

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example 1

[0251] Diffraction of red light

[0252] In the following non-limiting example, planar size calculations are performed for the diffraction of red light in accordance with the teachings of the preferred embodiments of the present invention.

[0253] These calculations are for a grating with a period of 509 nm formed in a light-transmitting substrate with a refractive index of 1.522 and a thickness of 2 mm. For a representative example of red light, a wavelength of 615 nm is chosen.

[0254] Using the above values ​​for grating period, refractive index and wavelength, a longitudinal field of view Ω of [-12.0°, +12.0°] can be obtained y And [-9.0°, +9.0°] lateral field of view Ω x . The total (diagonal) field of view Ω is calculated using Equation 5 to obtain Ω = [-15°, +15°].

[0255] For Δz = 25mm, the minimum size of the output optic (see Equation 6) is L O，min =10.6mm and W O，min =7.9mm. for L EB = 4mm, W EB = 1mm and O p = 3mm, the size of the output optics (see eq...

example 2

[0260] Diffraction of blue light

[0261] In the following non-limiting example, planar size calculations are performed for the diffraction of blue light in accordance with the teachings of the preferred embodiments of the present invention.

[0262] These calculations are for a grating with a period of 389 nm formed in a light-transmitting substrate with a refractive index of 1.529 and a thickness of 1.8 mm. For a representative example of blue light, a wavelength of 465 nm is chosen.

[0263] Using the above values ​​for grating period, refractive index and wavelength, a longitudinal field of view Ω of [-11°, +11°] can be obtained y and [-8.3°, +8.3°] lateral field of view Ω x . The total (diagonal) field of view Ω was calculated using Equation 5 to obtain Ω = [-13.7°, +13.7°].

[0264] For Δz = 20mm, the minimum dimension of the output optics is L O，min =7.8mm and W O，min = 5.8 mm. for L EB =5mm,W EB = 2mm and O p = 3mm, the size of the output optics is L O =15.8...

example 3

[0269] non-uniform duty cycle

[0270] Figure 11a -d shows the numerical calculation of the diffraction efficiency of the grating as a function of the duty cycle: impact angle φ iy is 50°( Figure 11a -b) and 55°( Figure 11c -d), and the modulation depth δ is 150nm ( Figure 11a and 11c ) and 300nm ( Figure 11b and 11d ). Figure 11a The different curves in -d correspond to wavelengths of 480 nm (solid line), 540 nm (dashed line) and 600 nm (dot-dash line). These calculations are based on Maxwell's equations for a grating of 455 nm period formed in a light-transmissive substrate with a refractive index of 1.53.

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Abstract

An optical relay device for transmitting light striking the optical relay device at a plurality of angles within a field-of-view is provided. The device comprises a light-transmissive substrate, an input optical element and an output optical element. The input element diffracts the light to propagate within the light-transmissive substrate via total internal reflection, and the output element diffracts the light out of the substrate. The output element is characterized by planar dimensions selected such that at least a portion of one or more outermost light rays within the field-of-view is directed to a two-dimensional region being at a predetermined distance from the substrate.

Description

technical field [0001] The present invention relates to optical elements, and more particularly to optical systems and devices that diffract light into one or more two-dimensional regions. Background technique [0002] Miniaturization of electronic devices is always an ongoing goal in the field of electronics. Electronic devices are often equipped with some form of display, which is visible to the user. As these electronic devices decrease in size, there is an increased need to manufacture compact displays compatible with small-sized electronic devices. In addition to having a small size, these displays should not sacrifice image quality and are available at low cost. By definition, the above properties are contradictory and many attempts have been made to provide some balanced solution. [0003] Electronic displays can provide a real image, the size of which is determined by the physical size of the display device, or a virtual image, whose size extends the size of the d...

Claims

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Application Information

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IPC IPC(8): G02B27/01G02B5/32G02B6/00G02B5/18
CPCG02B6/0038G02B6/0016
Inventor Y・尼夫
Owner MIRAGE INNOVATIONS
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