The holographic method to control transparent plate and film thickness variations by heterodyne measurement of the phase of transversed coherent light is theoretically and experimentally analyzed. It provides very high accuracy (about 1 nm) of the thickness variations measurements in visible range.
Use of phase methods in data input/output and for operations execution in optical processing and data transmission along internal communication channels is considered. Spatial phase difference modulation in digital optical matrix processors and similar time modulation in superfast internal communication channels can be applied for these purposes.
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