High speed hologram recording apparatus and method

Patent metadata

Field	Value
Publication number	US-9291997-B2
Application number	US-201313846251-A
Country	US
Kind code	B2
Filing date	Mar 18, 2013
Priority date	May 17, 2012
Publication date	Mar 22, 2016
Grant date	Mar 22, 2016

Abstract

A high speed hologram recording apparatus and method. The hologram recording apparatus includes: a light source for emitting coherent light; a beam splitter for splitting the coherent light emitted from the light source into a signal beam and a reference beam; a signal beam transfer unit comprising an angular deflector that changes a direction of the signal beam according to time, and irradiating the signal beam onto a hologram recording medium; and a reference beam transfer unit irradiating the reference beam at a location of the hologram recording medium where the signal beam is also irradiated.

First claim

What is claimed is:

1. A hologram recording apparatus comprising:
a light source which emits a coherent light;
a beam splitter which splits the light emitted from the light source into a signal beam and a reference beam;
a signal beam transfer unit comprising an angular deflector that changes a direction of the signal beam according to a time period elapsed between recordings, and said signal beam transfer unit irradiating the signal beam onto a hologram recording medium; and
a reference beam transfer unit irradiating the reference beam to a location of the hologram recording medium where the signal beam is also irradiated.

2. The hologram recording apparatus of claim 1 , wherein the signal beam transfer unit comprises:
a beam expander expanding a beam diameter of the signal beam transmitted from the beam splitter and providing an expanded signal beam to the angular deflector;
a spatial light modulator (SLM) modulating the signal beam according to hogel information, a proceeding direction of the signal beam being deflected by the angular deflector; and
a Fourier-transformation optical system which Fourier-transforms the modulated signal beam to focus the signal on the hologram recording medium, and said Fourier-transformation optical system comprising at least one Fourier-transformation device.

3. The hologram recording apparatus of claim 2 , wherein the signal beam transfer unit further comprises a phase mask which adjusts a shape and a size of the signal beam and makes an intensity of the signal beam consistent per unit area.

4. The hologram recording apparatus of claim 3 , wherein the phase mask is disposed between the SLM and the Fourier-transformation optical system, the beam expander being separate from the Fourier-transformation optical system.

5. The hologram recording apparatus of claim 4 , wherein the signal beam transfer unit further comprises a first Fourier-transformation device disposed between the SLM and the phase mask for condensing the signal beam incident onto the phase mask.

6. The hologram recording apparatus of claim 5 , wherein the reference beam transfer unit comprises:
at least one mirror which adjusts a path of the reference beam;
a relay system which adjusts a beam diameter of the reference beam; and
a deflector which adjusts an incident location and an incident angle of the reference beam that is incident onto the hologram recording medium.

7. The hologram recording apparatus of claim 6 , further comprising a location setting device for moving the hologram recording medium according to a recording location on the hologram recording medium.

8. The hologram recording apparatus of claim 7 , further comprising a controller configured to synchronize the light source, the angular deflector, the SLM, the deflector, and the location setting device with each other.

9. The hologram recording apparatus of claim 8 , wherein the reference beam transfer unit is configured so that the reference beam has a cross-sectional area that is a same as a cross-sectional area of the signal beam on the hologram recording medium.

10. The hologram recording apparatus of claim 8 , wherein the SLM relates to a transmission type.

11. The hologram recording apparatus of claim 8 , wherein a period of time for changing the direction of the signal beam by using the angular deflector is less than a period of time for moving the hologram recording medium by using the location setting device.

12. A hologram recording system comprising:
the hologram recording apparatus of claim 8 ; and
the hologram recording medium.

13. The hologram recording system of claim 12 , wherein the hologram recording medium comprises:
a recording layer formed of a photosensitive material; and
a protective layer coated on a surface of the recording layer for protecting the recording layer.

14. A hologram recording method comprising:
recording a first hogel by deflecting a signal beam, modulating the signal beam according to information about the first hogel, and irradiating the signal beam onto a hologram recording medium; and
recording a second hogel by deflecting the signal beam in another direction, loading information about the second hogel in the signal beam, and irradiating the signal beam onto the hologram recording medium,
wherein the recording of the first hogel and the second hogel is performed when the hologram recording medium is fixed at a same location during both recordings.

15. The hologram recording method of claim 14 , wherein the deflected direction of the signal beam is set so that the first and second hogels are adjacent to each other.

16. A hologram recording method comprising:
splitting light into a signal beam and a reference beam;
deflecting the signal beam in a plurality of directions according to a time period elapsed between recordings;
modulating signal beams deflected in the plurality of directions according to information about hogels;
recording a plurality of hogels by irradiating the modulated signal beams and the reference beam onto a hologram recording medium.

17. The hologram recording method of claim 16 , wherein the recording of the plurality of hogels is performed when the hologram recording medium is fixed.

18. The hologram recording method of claim 16 , further comprising moving and stabilizing the hologram recording medium after the recording of the plurality of hogels.

19. The hologram recording method of claim 18 , further comprising repeatedly performing the splitting, the deflecting, the modulating, and the recording operations after the moving of the hologram recording medium.

20. The hologram recording method of claim 18 , wherein a period of time for deflecting the signal beam in another direction is less than a period of time for moving the hologram recording medium.

21. The hologram recording apparatus of claim 1 , wherein the beam splitter comprises a semi-transmittive mirror.

22. The hologram recording method of claim 19 , wherein the operations are repeated until a number of deflected directions of the signal beam reaches a predetermined number.

Assignees

• Samsung Electronics Co Ltd

Inventors

• Pyun Kyoung-Seok
• Morozov Alexander
• Choi Chil-Sung
• Bovsunovskiy Ivan
• Druzhin Vladislav
• Putilin Andrew

Classifications

• G03H2001/0415

  for recording reflection holograms · CPC title

• G03H2001/0482

  Interference based printer · CPC title

• G03H1/0476 Primary

  Holographic printer (G03H1/268 takes precedence) · CPC title

• G03H1/16

  using Fourier transform ({G03H1/10}, G03H1/12, G03H1/14 take precedence; analogue computers G06G, e.g. G06G7/19) · CPC title

• G03H2001/2655

  Time multiplexing, i.e. consecutive records wherein the period between records is pertinent per se · CPC title