title: Increase of signal-to-noise ratio of a collinear holographic storage system with reference modulated by a ring lens array.
abstract: We propose an approach of a reference modulation in a collinear holographic storage system to increase the signal-to-noise ratio (SNR). We derive a solution that shows that the point-spread function is related to the autocorrelation function of the reference pattern times a defocusing phase term. Accordingly, the lens-array phase modulation is proposed and demonstrated theoretically. The SNR of the system can be dramatically enhanced to 63.2, rather than 2.3 in the traditional approach.
authors.affiliation: Department of Optics and Photonics, National Central University, Chung-Li 320, Taiwan.
authors.forename: Yeh-Wei
authors.initials: YW
authors.lastname: Yu
authors.forename: Chih-Yuan
authors.initials: CY
authors.lastname: Chen
authors.forename: Ching-Cherng
authors.initials: CC
authors.lastname: Sun