US 12,498,669 B2Granted

Method and system for simultaneous recording of superimposed holographic gratings for augmented reality devices (variants)

AssigneeSamsung Electronics Co., Ltd.

InventorsAleksandr Evgenyevich Angervaks, Roman Aleksandrovich Okun, Gavril Nikolaevich Vostrikov, Nikolay Viktorovich Muravev, Vladimir Nikolaevich Borisov, Mikhail Vyacheslavovich Popov

Life of this patent

Estimating the term…

patentgrep

Loading patent…

Abstract

A method and systems for simultaneous recording of superimposed holographic gratings for augmented reality devices are provided. The method includes: generating a beam by a single light source, directing the beam to a decoherence unit at a predetermined angle, forming at least two recording beams by the decoherence unit by splitting the beam, forming at least two recording channels in the decoherence unit to transmit the at least two recording beams and output them from the decoherence unit, output angles of each of the at least two recording beams being different, illuminating a recording material layer and one master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminary formed diffraction/holographic grating by the at least two non-interfering recording beams, simultaneously forming at least two superimposed holographic gratings from the master DOE/HOE on or in the recording material layer.

Claims17

Dependent claims

A method of simultaneous recording of superimposed holographic gratings for an augmented reality device, the method comprising:

generating an initial beam by a single light source;
directing the initial beam to a decoherence unit at a predetermined angle;
providing a formation of at least two recording beams by the decoherence unit, including:
splitting the initial beam into at least two recording beams, and
forming at least two recording channels in the decoherence unit to transmit the at least two recording beams and output them from the decoherence unit, output angles of each of the formed at least two recording beams being different, the formed at least two recording beams being non-interfering when leaving the decoherence unit, which is provided in accordance with at least one of:
output times (t) of each of the at least two recording beams, spatial positions of each of the at least two recording beams, polarization states of each of the at least two recording beams, or spectral compositions of each of the at least two recording beams;
illuminating a recording material layer and one master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminary formed diffraction/holographic grating by the at least two non-interfering recording beams;
and
providing simultaneous formation of at least two superimposed holographic gratings from the master DOE/HOE on or in the recording material layer, the formed superimposed holographic gratings having a same surface period and different spatial periods,
wherein the at least two recording beams output from the decoherence unit propagate to converge toward the recording material layer, and the recording material layer and the master DOE/HOE are in direct contact with each other, and
wherein an angle θi of incidence of the recording beam on the recording material layer and the master DOE/HOE is determined by a formula:
θ
i
=
sin
-
1
[
n
⁡
(
λ
/
(
dn
)
-
sin
⁡
(
sin
-
1
(
λ
2
⁢
nd
spati
)
+
cos
-
1
(
(
d
spati
d
)
)
)
]
,
where i is a number of the recording beam, n is a refractive index of the recording material layer, λ is a wavelength of the initial beam from the light source, d is a surface period of each recorded grating, and dspati is a spatial period of an i-th grating being recorded.

52 more elements

A system for simultaneous recording of superimposed holographic gratings for augmented reality devices, the system comprising:

a light source configured to generate an initial beam;
a decoherence unit configured to form and output at least two recording beams, the decoherence unit being configured such that output angles of each of the formed at least two recording beams are different, and the formed at least two recording beams being non-interfering when leaving the decoherence unit, which is provided in accordance with at least one of:
output times (t) of each of the at least two recording beams, spatial positions of each of the at least two recording beams, polarization states of each of the at least two recording beams, or spectral compositions of each of the at least two recording beams;
a recording material layer configured for forming thereon or therein at least two superimposed holographic gratings, the formed superimposed holographic gratings having a same surface period and different spatial periods;
a master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminarily formed diffractive/holographic grating, positioned in direct contact with the recording material layer or at a predetermined distance from the recording material layer to ensure interaction of the recording beams with the master DOE/HOE and the recording material layer;
and
a control unit connected to the light source, the decoherence unit, and the DOE/HOE master and the recording material layer, and configure to control the units by a signal from the control unit,
wherein the at least two recording beams output from the decoherence unit propagate so as to converge toward the recording material layer, and
wherein an angle θi of incidence of the recording beam on the recording material layer and the master DOE/HOE is determined by a formula:
θ
i
=
sin
-
1
[
n
⁡
(
λ
/
(
dn
)
-
sin
⁡
(
sin
-
1
(
λ
2
⁢
nd
spati
)
+
cos
-
1
(
(
d
spati
d
)
)
)
]
,
where i is a number of the recording beam, n is a refractive index of the recording material layer, λ is a wavelength of the initial beam from the light source, d is a surface period of each recorded grating, and dspati is a spatial period of an i-th grating being recorded.

50 more elements

A system for simultaneous recording of superimposed holographic gratings for augmented reality devices, the system comprising:

a coherent light source configured to form a continuous initial coherent beam;
a decoherence unit configured to form and output at least two recording beams, the decoherence unit being configured such that output angles of each of the formed at least two recording beams are different, and the formed at least two recording beams are non-interfering when leaving the decoherence unit, the decoherence unit comprising an optical forming unit configured to form at least two recording channels, each recording channel configured to transmit a respective recording beam, and the optical forming unit comprising, optically coupled, a beam splitter, at least one mirror element, and at least two optical beam shutters configured to alternately output the recording beams from the decoherence unit in accordance with an output time (t) of each of the at least two recording beams;
a recording material layer configured to form thereon or therein at least two superimposed holographic gratings, the formed superimposed holographic gratings having a same surface period and different spatial periods;
a master diffractive optical element/master holographic optical element (master DOE/HOE) comprising at least one preliminarily formed diffractive/holographic grating, disposed in direct contact with the recording material layer or at a predetermined distance from the recording material layer to ensure interaction of the recording beams with the master DOE/HOE and the recording material layer;
and
a control unit connected to the light source, the decoherence unit, and to the DOE/HOE master and the recording material layer, and configured to control at least one of the light source, the decoherence unit, and to the DOE/HOE master and the recording material layer by a signal from the control unit,
wherein the at least two recording beams output from the decoherence unit propagate so as to converge toward the recording material layer, and
wherein an angle θi of incidence of the recording beam on the recording material layer and the master DOE/HOE is determined by a formula:
θ
i
=
sin
-
1
[
n
⁡
(
λ
/
(
dn
)
-
sin
⁡
(
sin
-
1
(
λ
2
⁢
nd
spati
)
+
cos
-
1
(
(
d
spati
d
)
)
)
]
,
where i is a number of the recording beam, n is a refractive index of the recording material layer, λ is a wavelength of the initial beam from the light source, d is a surface period of each recorded grating, and dspati is a spatial period of an i-th grating being recorded.

49 more elements

Dependencies are inferred from the claim text.

Facts

Application: 17/748,529Filed 19 May 2022 · continuation
Priority: RU RU202112270929 Jul 2021
Published: US 2023/0032936 A12 Feb 2023
Granted: 16 Dec 2025
Term ends: Not estimatedThe source records don’t support an estimate.

Classification26 codes

G02B 5/32
Optical elements other than lenses: holograms used as optical elements
G03H 1/28
Processes or apparatus specially adapted to produce multiple sub- holograms or to obtain images from them, e.g. multicolour technique:…
G02B 5/1857
Manufacturing methods: using exposure or etching means, e.g. holography, photolithography, exposure to electron or ion beams
G02B 27/0103
Characterised by optical features: comprising holographic elements