Patent ID: 8374068
Filing Date: 2013-02-12
Classification: G11B

Abstract:
1. A lens system for data recording and retrieval, comprising: a. a first lens combination, wherein said first lens combination comprises a first lens element and a second lens element; b. a second lens combination, wherein said a second lens combination comprises a third lens element and a fourth lens element; c. a light source, wherein said light source comprises a laser beam, wherein said laser beam is divided into a reference beam and an object beam, wherein said reference beam is directed to a data recording location; d. a spatial light modulator, wherein said object beam is directed to said spatial light modulator, wherein said spatial light modulator operates on said object beam to form a digital data object beam, wherein said digital data object beam is directed through said first lens combination to form a Fourier transformed digital data object beam, wherein said Fourier transformed digital data object beam interferes with said reference beam at said data recording location, wherein said Fourier transformed digital data object beam forms a recordable Fourier volume at said data recording location; and e. a two-dimensional detector array, wherein said recordable Fourier volume at said data recording location is illuminated by said reference beam to form a reconstruction beam, wherein said reconstruction beam is directed through said second lens combination to form an inversely Fourier transformed digital data object beam; wherein said inversely Fourier transformed digital data object beam is directed to said a two-dimensional detector array to create 2D page data output, wherein each said lens of said first lens combination and said second lens combination is an air spaced aspheric doublet having at least 5-degrees of freedom, wherein said degrees of freedom are selected from the group consisting of a radii of said lens surface, a thickness of said lens, an air spacing between two said lenses, an index of refraction of said lens, and at least one conic aspheric constant of said lens.