Patent ID: 8125698

Claim:
An apparatus comprising: a light source configured to produce a coherent beam; a beam splitter configured to split the coherent beam into an object beam and a reference beam; an object beam optical system configured to direct the object beam to interfere with the reference beam at a holographic recording material, wherein the object beam optical system comprises a first lens configured to focus the object beam to a location within the holographic recording material; and a second lens having a first surface and a second surface, wherein the first surface has a non-planar shape configured such that substantially each ray of the object beam intersects the first surface with substantially normal incidence, the second surface is different from the first surface, and the second lens is configured to transmit the object beam into the holographic recording material such that substantially each ray of the object beam enters the holographic recording material substantially without refraction; and a reference beam optical system configured to direct the reference beam to interfere with the object beam at the holographic recording material.