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

Patent metadata

Field	Value
Publication number	US-12498669-B2
Application number	US-202217748529-A
Country	US
Kind code	B2
Filing date	May 19, 2022
Priority date	Jul 29, 2021
Publication date	Dec 16, 2025
Grant date	Dec 16, 2025

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.

First claim

What is claimed is:

1 . 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 θ i 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 d spati is a spatial period of an i-th grating being recorded.

2 . The method of claim 1 , wherein the formation of the at least two superimposed holographic gratings from the master DOE/HOE on or in the recording material layer comprises:
diffracting the recording beams on the at least one diffraction/holographic grating preliminary formed on or in the master DOE/HOE, and
interfering the diffracted and recording beams with each other on or in the recording material layer to provide recording of at least two superimposed holographic gratings.

3 . The method of claim 1 , wherein parameters of the recorded superimposed holographic gratings are adjusted by rotation or linear displacement of the recording material layer and the master DOE/HOE relative to the at least two recording beams incident on the recording material layer and the master DOE/HOE, between recording cycles.

4 . The method of claim 1 , wherein rotation or linear displacement of the recording material layer and the master DOE/HOE relative to each other between recording cycles is provided for adjusting parameters of the superimposed holographic gratings being recorded.

5 . The method of claim 1 , wherein, at a one-segment recording of a holographic grating as a whole, a diffraction efficiency is varied along an X-axis or along a Y-axis of a field of the recorded holographic grating.

6 . The method of claim 1 , wherein when performing multiple-segment recording of a holographic grating on or in the layer of the recording material, a diffraction efficiency is varied in the segments constituting the multiple-segment recorded holographic grating.

7 . The method of claim 6 , wherein varying the diffraction efficiency in the segments is performed along an X-axis or a Y-axis of a field of a respective segment of the multiple-segment recorded holographic grating on or in the recording material layer.

8 . 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 (mast

Assignees

• Samsung Electronics Co Ltd

Inventors

• ANGERVAKS Aleksandr Evgenyevich
• OKUN Roman Aleksandrovich
• Vostrikov Gavril Nikolaevich
• Muravev Nikolay Viktorovich
• Borisov Vladimir Nikolaevich
• Popov Mikhail Vyacheslavovich

Classifications

• G02B2027/0109

  comprising details concerning the making of holograms · CPC title

• G03H2222/42

  Reference beam at recording stage · CPC title

• G03H2222/43

  Object beam at recording stage · CPC title

• G03H2222/33

  Pulsed light beam · CPC title

• G03H2223/23

  Diffractive element · CPC title