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System and method for steering focal plane data using cylindrical coordinates to access data locations in a holographic memory
| Details |
Inventors: Campbell, Scott Patrick; Curtis, Kevin Richard; Tackitt, Michael C.;
Assignee: Lucent Technologies Inc. (Murray Hill, NJ)
Primary Examiner: Nelms; David C.
Assistant Examiner: Tran; Andrew Q.
Attorney, Agent or Firm:
Systems and methods for steering a complex, spatially-modulated incident beam of coherent light to gain access to data locations in a holographic memory cell (HMC). One of the systems includes: (1) a reflective element, locatable proximate a first focal plane of the incident beam, (2) a rotational steering mechanism, coupled to the reflective element, that orients the reflective element according to a desired rotational angle to steer the incident beam in a desired direction and (3) a refractive element that refracts the beam reflected from the reflective element to create a second focal plane for the beam, the HMC locatable proximate the second focal plane and rotatable about an axis of a plane thereof to receive the beam at a location thereon that is a function of the desired direction and an angular position of the HMC. |
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DETAILED DESCRIPTION To address the above-discussed deficiencies of the prior art, the present invention provides systems and methods for steering a complex, spatially-modulated incident beam of coherent light to gain access to data locations in an HMC.
One of the systems includes: (1) a reflective element, locatable proximate a first focal plane of the incident beam, (2) a rotational steering mechanism, coupled to the reflective element, that orients the reflective element according to a desired rotational angle to steer the incident beam in a desired direction and (3) a refractive element that refracts the beam reflected from the reflective element to create a second focal plane for the beam, the HMC locatable proximate the second focal plane and rotatable about an axis of a plane thereof to receive the beam at a location thereon that is a function of the desired direction and an angular position of the HMC.
The present invention therefore introduces the broad concept of rotating a reflective element, such as a mirror, and the HMC itself to read or write to different locations on the HMC.
In one embodiment of the present invention, the first focal plane is a Fourier plane.
Alternatively, the first focal plane may be an image plane.
In one embodiment of the present invention, the second focal plane is an image plane.
Alternatively, the second focal plane may be a Fourier plane.
In one embodiment of the present invention, the refractive element is a convex lens.
Alternatively, the refractive element may be a concave lens, provided that other elements are included to focus the beam.
In one embodiment of the present invention, the HMC is substantially planar.
However, the present invention is employable with nonplanar HMCs, should they be advantageous in a given application.
In one embodiment of the present invention, the system further comprises: (1) a second reflective element, locatable proximate the second focal plane, (2) a second rotational steering mechanism, coupled to the second reflective element, that orients the second reflective element according to a second desired rotational angle to steer the incident beam in a second desired direction and (3) a second refractive element that refracts the beam reflected from the second reflective element to create a third focal plane for the beam, the location on the HMC further being a function of the second desired direction
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Optical Systems 
