Abstract
Using a compound prism with a holographic optical element and a birefringence wedge, we have developed a twin-spot method pickup for a Mini Disc player. Since tolerance sharing is optimized by ray trace simulation, servo signal offsets caused by assembly error and fabrication error are compensated simply by positioning and rotating the compound prism in a plane; however, all servo and magneto-optical (MO) signals are detected by a photodiode. Although two half-wave plates are placed in the diverging light beam, it is theoretically and experimentally revealed that they hardly deteriorate the MO signals. The jitter value of the MO signal reproduced by this pickup reached 19 ns.
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