Comparison of peristrophic multiplexing and a combination of angular and peristrophic holographic multiplexing in a thick PVA/acrylamide photopolymer for data storage.
Two different types of multiplexing are used to store 90 holograms at the same location in a polyvinyl alcoholacrylamide photopolymer material. In the first, the 90 holograms are stored using only peristrophic multiplexing, whereas in the second a combination of angular and peristrophic multiplexing is used. The results (diffraction efficiency and dynamic range, M#) obtained with these two multiplexing techniques are compared. With the first, the dynamic range was M# = 13 and with the second M# = 8. An exposure schedule method is used to calculate the exposure time necessary to store the holograms with a more uniform, higher diffraction efficiency.
Fernández
Elena
E
Dep. Interuniversitario de Optica, Universidad de Alicante, Apartado 99, E-03080 Alicante, Spain.
Ortuño
Manuel
M
Gallego
Sergi
S
García
Celia
C
Beléndez
Augusto
A
Pascual
Immaculada
I