Apparatus for holographic data storage
First Claim
1. An apparatus for holographic data storage, the apparatus comprising:
- a) an optical focusing element having an associated object plane and an associated image plane;
b) a spatial light modulator located at the object plane of the optical focusing element;
c) a spatial light detector located at the image plane of the optical focusing element;
d) an optical path extending from the focusing element to the spatial light detector;
e) a holographic storage material located in the optical path.
3 Assignments
0 Petitions
Accused Products
Abstract
A holographic data storage apparatus having no readout lens. The apparatus has a spatial light modulator (SLM), a focusing element such as a lens, a holographic data storage material and a spatial light detector such as a CCD. The lens is located between the SLM and CCD such that the SLM is imaged onto the CCD (i.e. the positions of the SLM, lens, and CCD satisfy the lens equation). The holographic storage material is located between the lens and CCD. Preferably, the storage material is located centered upon a Fourier plane of the lens. In this case, the apparatus also has a phase mask located adjacent to the SLM. Alternatively, the storage material is located a distance away from the Fourier plane or is not centered on the Fourier plane. In yet another embodiment, the holographic storage material is located in contact with the CCD.
111 Citations
36 Claims
-
1. An apparatus for holographic data storage, the apparatus comprising:
-
a) an optical focusing element having an associated object plane and an associated image plane; b) a spatial light modulator located at the object plane of the optical focusing element; c) a spatial light detector located at the image plane of the optical focusing element; d) an optical path extending from the focusing element to the spatial light detector; e) a holographic storage material located in the optical path. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
-
-
17. An apparatus for providing data readout from and data input to a holographic storage material, the apparatus comprising:
-
a) an optical focusing element having an associated object plane and an associated image plane; b) a spatial light modulator located at the object plane of the focusing element; c) a spatial light detector located at the image plane of the focusing element; d) an optical path extending from the focusing element to the spatial light detector; d) a holding means for holding the holographic data storage material in the optical path. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32)
-
-
33. An apparatus for providing readout of data from a holographic storage material containing a hologram, the apparatus comprising:
-
a) a spatial light detector; b) a holding means for holding the storage material; c) a light path extending from the storage material to the spatial light detector when the holographic storage material is held in the holder; c) a means for directing a reference beam into the storage material such that the hologram causes a converging beam to exit from the storage material and travel along the light path to the detector when the reference beam is input into the storage material; the apparatus not having an imaging element in the light path. - View Dependent Claims (34, 35, 36)
-
Specification