Optical head for hologram optical apparatus and method of operating the same

Patent metadata

Field	Value
Publication number	US-9753432-B2
Application number	US-201314079983-A
Country	US
Kind code	B2
Filing date	Nov 14, 2013
Priority date	Nov 14, 2012
Publication date	Sep 5, 2017
Grant date	Sep 5, 2017

Abstract

An optical head for a hologram optical apparatus and a method of operating the same are provided. The optical head for the hologram optical apparatus includes a reference light unit for guiding reference light, a signal light unit for guiding signal light, and a light source unit for providing 1 the reference light and the signal light to the reference light unit and the signal light unit, wherein the reference light unit and the signal light unit are stacked. The signal light unit includes: a plurality of optical waveguides stacked sequentially; composite hologram optical elements and lighting hologram optical elements disposed on the plurality of optical waveguides; an optical modulator for modulating light output from the plurality of the optical waveguides; and a lens for condensing light output from the optical modulator onto a recording layer.

First claim

What is claimed is:

1. An optical head for a hologram optical apparatus, the optical head comprising:
a reference light unit which generates a reference light for hologram recording;
a signal light unit which generates a signal light for hologram recording; and
a light source unit which provides light to the reference light unit and the signal light unit,
wherein the reference light unit and the signal light unit are vertically stacked; and
wherein the signal light unit comprises:
a single optical waveguide onto which the signal light from the light source unit is incident;
a composite hologram optical element and a lighting hologram optical element, each comprising a three layer hologram corresponding to red, green, and blue light, disposed on the single optical waveguide;
a single optical modulator which modulates light output from the single optical waveguide; and
a lens which condenses light emitted from the single optical modulator onto the hologram recording layer.

2. The optical head for a hologram optical apparatus according to claim 1 , wherein the lens comprises a holographic Fourier lens.

3. The optical head for a hologram optical apparatus according to claim 1 , wherein the reference light generating unit comprises:
an optical waveguide;
an upper composite hologram optical element disposed on a top surface of the optical waveguide; and
a lower composite hologram optical element disposed on a bottom surface of the optical waveguide.

4. The optical head for a hologram optical apparatus according to claim 3 , wherein the upper and lower composite hologram optical elements, each comprise a three layer hologram.

5. The optical head for a hologram optical apparatus according to claim 1 , wherein the light source unit comprises:
a first light source, a second light source, and a third light source;
a reflection unit which reflects light emitted from the first light source, the second light source, and the third light source; and
a mirror which reflects light from the reflection unit to the signal light unit.

6. The optical head for a hologram optical apparatus according to claim 5 , wherein the first light source comprises a first laser which emits light of a first color, the second light source comprises a second laser which emits light of a second color, different from the first color, and the third light source comprises a third laser which emits light of a third color, different from the first color and the second color.

7. The optical head for a hologram optical apparatus according to claim 6 , wherein the first laser is one of a continuous wave (CW) laser and a quasi CW laser, the second laser is one of a CW laser and a quasi-CW laser, and the third laser is one of a CW laser and a quasi-CW laser.

8. The optical head for a hologram optical apparatus according to claim 5 , wherein the reflection unit comprises a mirror and a beam splitter.

9. An optical head for a hologram optical apparatus, the optical head comprising:
a reference light unit which generates a reference light for hologram recording;
a signal light unit which generates a signal light for hologram recording; and
a light source unit which provides light to the reference light unit and the signal light unit,
wherein the reference light unit and the signal light unit are vertically stacked, and
wherein the signal light unit comprises:
a plurality of optical waveguides stacked vertically;
a composite hologram optical element and a lighting hologram optical element, each comprising a single layer hologram, disposed on each of the plurality of optical waveguides;
an optical modulator which modulates light output from the plurality of optical waveguides; and
a lens which condenses light emitted from the optical modulator onto the hologram recording layer.

10. The optical head for a hologram optical apparatus according to claim 9 , wherein the plurality of optical waveguides comprises an optical waveguide for red light, an optical waveguide for green light, and an optical waveguide for blue light, wherein the optical waveguide for red light, the optical waveguide for green light, and the optical waveguide for blue light are vertically stacked.

11. The optical head for a hologram optical apparatus according to claim 9 , wherein the composite hologram optical element and the lighting hologram optical element are both disposed on one of a top surface and a bottom surface of each of the plurality of optical waveguides.

12. The optical head for a hologram optical apparatus according to claim 9 , wherein the lens comprises a Fourier lens.

13. The optical head for a hologram optical apparatus according to claim 9 , wherein the composite hologram optical elements do not overlap each other in a vertical direction.

14. The optical head for a hologram optical apparatus according to claim 13 , wherein the light source unit comprises a first light source, a second light source, and a third light source, wherein each of the first light source, the second light source, and the third light source directs light to the composite hologram optical element disposed on one of the plurality of optical waveguides.

15. The optical head for a hologram optical apparatus according to claim 9 , wherein thicknesses of the composite hologram optical elements are the same.

16. The optical head for a hologram optical apparatus according to claim 9 , wherein thicknesses of the lighting hologram optical elements are the same.

17. The optical head for a hologram optical apparatus according to claim 9 , wherein thicknesses of the composite hologram optical element and the lighting hologram optical element disposed on each of the optical waveguides are the same.

18. The optical head for a hologram optical apparatus according to claim 9 , wherein refractive index modulations of the composite hologram optical elements are the same.

19. A method of operating an optical head of a hologram optical apparatus, the method comprising:
a light source unit generating reference light and signal light;
a reference light unit directing the reference light from the light source unit to a hologram recording layer;
a signal light unit directing the signal light from the light source unit to the hologram recording layer;
wherein the reference light generating unit and the signal light generating unit are vertically stacked;
wherein the signal light generating unit comprises an optical waveguide, a composite hologram optical element disposed on the optical waveguide, and a lighting hologram optical element disposed on the optical waveguide; and
wherein the method further comprises adjusting at least one of a thickness and a refractive index modulation of the composite hologram optical element.

20. The method according to claim 19 , wherein the optical waveguide comprises
a plurality of optical waveguides which are vertically stacked; and
wherein a composite hologram optical element and a lighting hologram optical element, each comprising a single layer hologram, are disposed on each of the optical waveguides.

21. The method according to claim 20 , wherein the composite hologram optical elements do not overlap each other.

22. The method according to claim 21 , wherein the light source unit generating the reference light and the scanning light comprises the light source unit illuminating each of the composite hologram optical elements at certain time intervals.

23. The method according to claim 19 , wher

Assignees

• Samsung Electronics Co Ltd

Inventors

• Pyun Kyoung-Seok
• Choi Chil-Sung
• Morozov Alexander
• An Jung-Kwuen
• Kim Sun-Il
• Bovsunovskiy Ivan
• Putilin Andrew

Classifications

• G03H2001/048

  Parallel printer, i.e. a fringe pattern is reproduced · CPC title

• G03H2210/22

  2D SLM object wherein the object beam is formed of the light modulated by the SLM · CPC title

• G03H1/16

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

• G03H2222/34

  Multiple light sources · CPC title

• G03H2223/16

  Optical waveguide, e.g. optical fibre, rod · CPC title