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.
© 2010 Optical Society of America
Original Manuscript: December 2, 2009
Revised Manuscript: January 28, 2010
Manuscript Accepted: February 15, 2010
Published: April 5, 2010
Yeh-Wei Yu, Chih-Yuan Chen, and Ching-Cherng Sun, "Increase of signal-to-noise ratio of a collinear holographic storage system with reference modulated by a ring lens array," Opt. Lett. 35, 1130-1132 (2010)