One of the problems that affects the practical use of holographic memory is deterioration of the reproduced images due to aberration in the optical system. The medium used in holographic memory systems must be interchangeable, and hence, it is necessary to clarify the influence of aberration in the optical system on the signal quality and perform aberration correction for drive compatibility. In this study, aberration is introduced in the reference light beam during image reproduction, and the deterioration of the reproduced image signal is examined.
A major barrier to the practical use of holographic memories is deterioration of reconstructed signals due to shrinkage of the medium. It is reported that a photopolymer medium shrinks mainly in the thickness direction during recording or as a result of variations in ambient temperature, and the optimal reconstruction angle shifts and deteriorates. To avoid the influence of medium shrinkage, we propose co-axial, dual-reference-beam recording and reconstruction. The recording and reconstruction characteristics of this method were examined through simulation and experiments, and the results confirmed that in holographic multiplex recording, the reference-beam angle is not affected by medium shrinkage, and stable recording and reconstruction are achieved.
This paper describes the finite element method analysis of (XYlt) −35°/−1° rotated X-cut quartz oscillators vibrating in the length-extensional mode and the experimental data of the sample processed monolithically by the wet etching. The oscillator consists of the resonator with a slot and an integral mounting system and has the first order temperature frequency coefficient α = −0.6 ×10 −6 /°C, the second order temperature frequency coefficient β = −3.5 ×10 −8 /°C 2 , and the parameters of the electrical equivalent circuit in the air: the series inductance L 1 = 2.70 H, the capacitance ratio r = 192, the series resistance R 1 = 1080 Ω, and Q = 19000.
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