Several dynamical aspects of the DuPont photopolymer film HRF-150-38 for holographic storage are described. We study temporal aspects of exposure, exposure time, processing situations, and storage effect. The quantities studied are diffraction efficiencies, thickness changes, and Bragg angle. The experimental results are performed with an argon-ion laser at 514.5 nm.
Inberconnections are becoming significantly important because of their applications in parallel processing. One type of interconnection is the Benes network which has a simple control algorithm. In this paper, the Benes network is extended to two dimensions. The control algorithm for the 2-D network is described and the complexities of the 1-D and 2-D architectures are compared.
A recently proposed 3-D optical Fredkin gate interconnection network1 is further analyzed. It is shown that any arbitrary permutation of an array of N × N channels can be performed by cascading 3N – 1 switching layers. The complexity of this architecture, which is defined as the total number of switching elements, is determined and compared with a similar parameter for the 2-D architecture. It is shown that the 3-D architecture becomes superior to the 2-D architecture as the number of channels N
c
increases. In particular, the 3-D architecture is found very suitable for the cases where N
c
is a square number.
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