Claims
- 1. A method for apodizing an incident reference beam for a holographic recording medium, comprising impinging the incident reference beam on an apodizer and producing a modulated reference beam having a substantially uniform intensity profile on a region of the holographic recording medium, wherein the incident reference beam is off-axis from the normal at a point in the region and further wherein the region comprises an overlap of the modulated reference beam and an object beam.
- 2. The method of claim 1, wherein the incident reference beam is selected from the group consisting of a collimated beam, a converging beam and a diverging beam.
- 3. The method of claim 1, wherein the incident reference beam is a spherical beam.
- 4. The method of claim 1, wherein the modulated reference beam is a spherical beam.
- 5. The method of claim 1, wherein the region is a planar surface on or within the holographic recording medium.
- 6. The method of claim 1, wherein the holographic recording medium is an optically flat planar medium.
- 7. The method of claim 1, wherein the incident reference beam is a collimated beam having a substantially uniform intensity profile on a surface normal to the incident reference beam.
- 8. The method of claim 1, wherein the apodizer comprises a transmissive mask.
- 9. The method of claim 1, wherein the apodizer comprises a diffractive apodization system
- 10. The method of claim 1, wherein the holographic recording medium is a holographic recording medium comprising a polymer matrix.
- 11. The method of claim 10, wherein the holographic recording medium has a Rayleigh ratio (R90°) less than 7×10−1 cm−1.
- 12. The method of claim 10, wherein the holographic recording medium has a thickness greater than 200 μm and a An of 3×10−3 or higher.
- 13. An apodization system, comprising an apodizer for apodizing an incident reference beam and a holographic recording medium.
- 14. The apodization system of claim 13, further comprising a light source for the incident reference beam and a light source for an object beam.
- 15. The apodization system of claim 14, wherein the object beam contains encoded information and the incident reference beam is an unmodulated beam.
- 16. The apodization system of claim 13, wherein the apodizer comprises a transmissive mask.
- 17. The apodization system of claim 13, wherein the apodizer comprises a diffractive apodization system.
- 18. A method of computing an apodizer of an apodization system comprising the apodizer and a holographic recording medium, said method comprising ray-tracing an intensity profile relationship between an apodization plane and an associated surface in the holographic recording medium.
- 19 The method of claim 18, wherein said ray-tracing is by geometrical optics.
- 20. The method of claim 18, further comprising determining an apodizer transmittance.
- 21. A method of computing an apodizer of an apodization system comprising the apodizer and a holographic recording medium, said method comprising determining an intensity profile relationship between an apodization plane and an associated surface in the holographic recording medium.
- 22. The method of claim 21, wherein said determining an intensity profile relationship is by physical optics.
- 23. The method of claim 21, further comprising determining an apodizer transmittance.
RELATED APPLICATIONS
[0001] This application claims priority from Provisional Application Serial No. 60/296,449, filed Jun. 8, 2001, entitled “METHOD FOR IMPROVED HOLOGRAPHIC RECORDING USING BEAM APODIZATION,” the entire disclosure of which is incorporated herein by reference.
Provisional Applications (1)
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Number |
Date |
Country |
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60296449 |
Jun 2001 |
US |