US 12,748,377 B2Granted

Holographic optical element printing method using tunable focus lens and rotating mirror

AssigneeKorea Electronics Technology Institute

InventorsJi Soo Hong, Sung Hee Hong, Young Min Kim, Jin Soo Jeong, Byoung Hyo Lee

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Abstract

Provided is a holographic optical element printing method using a tunable focus lens and a rotating mirror. According to an embodiment, a holographic printer includes: a first optical engine and a second optical engine configured to adjust a phase of an incident collimated beam and emit the collimated beam; and a first reduction optical system and a second reduction optical system configured to reduce the beam emitted from the first optical engine and the second optical engine and to allow the beam to enter a holographic material, wherein each of the first optical engine and the second optical engine includes: a rotating mirror configured to reflect while adjusting the phase of the incident collimated beam through rotation; and a tunable focus lens configured to refract while adjusting the phase of the incident collimated beam reflected from the rotating mirror through focus tuning. Accordingly, by using a combination of a tunable focus lens and a rotating mirror, instead of using an SLM of a holographic printer, quality of an HOE may be enhanced, a printing time per hogel may be reduced and a total recording time may be greatly reduced when holographic printing of the HOE is performed.

Claims13

Dependent claims

A holographic printer comprising:

a first optical engine configured to adjust a phase of an incident collimated beam and emit the collimated beam;
a first reduction optical system configured to reduce a size of the beam emitted from the first optical engine and to allow the beam to enter a holographic material;
a second optical engine configured to adjust a phase of an incident collimated beam and emit the collimated beam;
and
a second reduction optical system configured to reduce a size of the beam emitted from the second optical engine and to allow the beam to enter the holographic material,
wherein each of the first optical engine and the second optical engine comprises:
a rotating mirror configured to reflect the incident collimated beam passing through an aperture, while adjusting the phase of the incident collimated beam through rotation of the rotating mirror,
the rotating mirror being positioned downstream of the aperture aligned with an optical axis;
and
a tunable focus lens configured to refract and adjust the phase of the incident collimated beam reflected from the rotating mirror through focus tuning of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises the aperture configured to limit a width of the incident collimated beam to a defined width, and to transmit the collimated beam toward the rotating mirror, and wherein the defined width is equal to an effective width of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises a beam splitter configured to reflect the collimated beam passing through the aperture and transmit the collimated beam to the rotating mirror, and to pass the collimated beam reflected from the rotating mirror toward the tunable focus lens, and
wherein each of the first optical engine and the second optical engine further comprises an optical system configured to transmit the collimated beam passing through the beam splitter to the tunable focus lens.

10 more elements

A holographic printing method comprising:

adjusting, by a first optical engine, a phase of an incident collimated beam and emitting the collimated beam;
reducing, by a first reduction optical system, the beam emitted from the first optical engine and allowing the beam to enter a holographic material;
adjusting, by a second optical engine, a phase of an incident collimated beam and emitting the collimated beam;
and
reducing, by a second reduction optical system, the beam emitted from the second optical engine and allowing the beam to enter the holographic material,
wherein each of the first optical engine and the second optical engine comprises:
a rotating mirror configured to reflect the incident collimated beam passing through an aperture, while adjusting the phase of the incident collimated beam through rotation of the rotating mirror, the rotating mirror being positioned downstream of the aperture aligned with an optical axis;
and a tunable focus lens configured to refract while adjusting the phase of the incident collimated beam reflected from the rotating mirror through focus tuning of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises the aperture configured to limit a width of the incident collimated beam to a defined width, and to transmit the collimated beam toward the rotating mirror, and wherein the defined width is equal to an effective width of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises a beam splitter configured to reflect the collimated beam passing through the aperture and transmit the collimated beam to the rotating mirror, and to pass the collimated beam reflected from the rotating mirror toward the tunable focus lens, and
wherein each of the first optical engine and the second optical engine further comprises an optical system configured to transmit the collimated beam passing through the beam splitter to the tunable focus lens.

8 more elements

A holographic printing method comprising:

generating, by a light source, a collimated beam;
adjusting, by a first optical engine, a phase of the collimated beam generated at the light source, and emitting the collimated beam;
reducing, by a first reduction optical system, the beam emitted from the first optical engine and allowing the beam to enter a holographic material;
adjusting, by a second optical engine, a phase of the collimated beam generated at the light source, and emitting the collimated beam;
and
reducing, by a second reduction optical system, the beam emitted from the second optical engine and allowing the beam to enter the holographic material,
wherein each of the first optical engine and the second optical engine comprises:
a rotating mirror configured to reflect the incident collimated beam passing through an aperture, while adjusting the phase of the incident collimated beam through rotation of the rotating mirror, the rotating mirror being positioned downstream of the aperture aligned with an optical axis;
and a tunable focus lens configured to refract while adjusting the phase of the incident collimated beam reflected from the rotating mirror through focus tuning of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises the aperture configured to limit a width of the incident collimated beam to a defined width, and to transmit the collimated beam toward the rotating mirror, and wherein the defined width is equal to an effective width of the tunable focus lens,
wherein each of the first optical engine and the second optical engine further comprises a beam splitter configured to reflect the collimated beam passing through the aperture and transmit the collimated beam to the rotating mirror, and to pass the collimated beam reflected from the rotating mirror toward the tunable focus lens, and
wherein each of the first optical engine and the second optical engine further comprises an optical system configured to transmit the collimated beam passing through the beam splitter to the tunable focus lens.

9 more elements

Dependencies are inferred from the claim text.