作者: Eiji Muramatsu , Naoharu Yanagawa
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摘要: A light source is provided for emitting a first beam having far-field pattern of an elliptic shape. The linearly polarized polarizing direction in major axis the half-wave plate rotating 90 degrees, thereby changing to second beam. splitter shape into circular arranged transmit and reflect third different from that by degrees. quarter-wave transmitting apply it optical disc, reflected disc applied photodetector.