A scheme by which information retrieved from holograms can be made in a true sequential fashion (no buffer storage) is described. By using a reduction lens and making the Fourier transform hologram only in the transverse direction, high information recording density can be achieved in both the longitudinal and transverse direction on a long tape. A tenfold or more increase in total information density as compared with direct recording methods is possible. The feasibility of using this scheme for audio recording is demonstrated. When fully implemented, a multitrack (two or more) and multichannel (four or more) audio system is possible. The hologram tape can be economically replicated.
© 1976 Optical Society of America
Original Manuscript: July 25, 1974
Revised Manuscript: June 22, 1976
Published: November 1, 1976
C. S. Ih, "Sequential information retrieval from holograms," Appl. Opt. 15, 2698-2700 (1976)