Holographic storage lenses
View Patent ↗Disclosed are holographic storage systems and lenses for holographic storage systems. The lens units can be of a single-component design. The lenses can be used to both record to photorefractive storage media and to read from photorefractive storage media.
1. A holographic recording system comprising:
an encoding device;
a storage medium;
a single-component lens placed between the encoding device and the storage medium, wherein the single-component lens directs a signal beam encoded by the encoding device onto a pupil plane positioned at the storage medium, and wherein the single-component lens has a pupil aberration that is less than 40% of the on axis pupil radius.
2. The holographic recording system of claim 1 , wherein the encoding device is a spatial-light modulator.
3. The holographic recording system of claim 1 , wherein the single-component lens has an axial thickness of between 50% of EFL and 110% of EFL.
4. The holographic recording system of claim 1 , wherein the single-component lens comprises at least one material with a refractive index greater than 1.6.
5. The holographic recording system of claim 1 , wherein the single-component lens comprises a first lens element and a second lens element.
6. The holographic recording system of claim 5 , wherein the difference between the refractive index of the first lens element and the second lens element is at least 0.2.
7. The holographic recording system of claim 1 , wherein the single-component lens has a pupil with a separation of 25% of EFL to about 80% of EFL.
8. The holographic recording system of claim 1 , wherein the single-component lens has a Petzval sum less than 0.0030 mm −1 when the single component lens is scaled to have an effective focal length of 100 mm.
9. The holographic recording system of claim 1 , wherein the single-component lens has a field-of-view between 50 degrees and 75 degrees.
10. The holographic recording system of claim 1 , wherein the single-component lens is telecentric.
11. The holographic recording system of claim 1 , wherein the single-component lens has an object distance from 100% of EFL to 160% of EFL.
12. The holographic recording system of claim 1 , wherein the single-component lens has a pupil separation of from 25% of EFL to 80% of EFL.
13. A holographic retrieval system comprising:
a storage medium;
a sensor;
a single-component lens placed between the sensor and the storage medium, wherein the single-component lens focuses a signal beam emanating from the storage medium onto the sensor, and wherein the single-component lens has a pupil aberration that is less than 40% of the on axis pupil radius.
14. The holographic retrieval system of claim 13 , wherein the single-component lens has an axial thickness of between 50% of EFL and 110% of EFL.
15. The holographic retrieval system of claim 13 , wherein the single-component lens comprises at least one material with a refractive index greater than 1.6.
16. The holographic retrieval system of claim 13 , wherein the single-component lens comprises a first lens element and a second lens element.
17. The holographic retrieval system of claim 13 , wherein the difference between the refractive index of the first lens element and the second lens element is at least 0.2.
18. The holographic retrieval system of claim 13 , wherein the single-component lens has a pupil with a separation of 25% EFL to about 80% EFL.
19. The holographic retrieval system of claim 13 , wherein the single-component lens has a Petzval sum less than 0.0030 mm −1 when the single component lens is scaled to have an effective focal length of 100 mm.
20. The holographic retrieval system of claim 13 , wherein the single-component lens has a field-of-view between 50 degrees and 75 degrees.
21. The holographic retrieval system of claim 13 , wherein the single-component lens is telecentric.
22. The holographic retrieval system of claim 13 , wherein the single-component lens has an object distance from 100% of EFL to 160% of EFL.
23. The holographic retrieval system of claim 13 , wherein the single-component lens has a pupil separation of from 25% of EFL to 80% of EFL.