File:CD pickup and beam splitter.PNG

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CD_pickup_and_beam_splitter.PNG ‎(387 × 186 pixels, file size: 4 KB, MIME type: image/png)

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CDのピックアップにみるビームスプリッタの利用例

偏光ビームスプリッタと1/4波長板とがレーザーからの光とCDからの反射光を分離するための重要な役割を果たしている。

偏光ビームスプリッタを透過した段階で、レーザー光は偏光している。これをコリメータレンズで平行光線にし、対物レンズでCDの反射層に焦点を結ばせる。この際1/4波長板を通るので、円偏光になっている。反射すると円偏光の回転方向が反転する。従って反射光が1/4波長板を通ると入射光と垂直の偏光面を持つことになる。これを偏光ビームスプリッタで分離し、光検出器に送る。

ja:http://www.lensya.co.jp/003/mokuji/99.htm及びja:http://qopt.iis.u-tokyo.ac.jp/optics/opticalDevices.pdfを参考に投稿者が記事及び画像を作製した。


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current03:39, 10 February 2006Thumbnail for version as of 03:39, 10 February 2006387 × 186 (4 KB)NekoJaNekoJa (talk | contribs)CDのピックアップにみるビームスプリッタの利用例 偏光ビームスプリッタと1/4波長板とがレーザーからの光とCDからの反射光を分離するための重要な役割を果たしている。 偏光ビームスプ�

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