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 single-component lens comprising:
a meniscus-shaped component, wherein the meniscus shaped component has an axial thickness of between 50% and 110% of EFL of the single-component lens, the single-component lens has a pupil separation that is at least 25% of EFL, the single-component lens has an object distance that is at least 100% of EFL from the single-component lens, and wherein single-component lens has a first outside aspheric surface having a curvature and a second outside aspheric surface having a curvature and wherein the sum of the curvature of the first aspheric surface and the curvature of the second aspheric surface is between −0.01 mm −1 and −0.04 mm −1 .
2. The single-component lens of claim 1 , wherein the single-component lens has an f-number from 4.0 to 16.0.
3. The single-component lens of claim 1 , wherein the single-component lens has a pupil separation of from 25% of EFL to 80% of EFL.
4. The single-component lens of claim 1 , wherein the single-component lens is telecentric.
5. The single-component lens of claim 1 , wherein the single-component lens has a field-of-view between 50 degrees and 75 degrees.
6. The single-component lens 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.
7. The single-component lens of claim 1 , wherein the single-component lens comprises at least one material with a refractive index greater than 1.6.