Calculations on modulation transfer function of a read-only optical disk system with super resolution

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Abstract
Simulations have been performed for signal reproduction from a read‐only super resolution optical disk using a beam splitting method, in which a collimated laser beamgenerated by a laser diode is split into two beams with orthogonal polarizations and then recombined using polarizing beamsplitters. The beam with a higher power is used to raise the temperature of the mask layer, while the one with a lower power is employed to reproduce the recorded data. Tilting one of the laser beams against the other results in two laser spots partially overlapped at the focal plane, and the distance between the center of the two spots can be controlled by a galvanomirror. This allows signal readout with maximum resolution independent of the disk rotation speed.

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