A02B-0200-B503

A02B-0200-B503圓周角是360度，相當(dāng)于一個波長。上述的90度位相差也就相當(dāng)于四分之一的波長。如果各向異性介質(zhì)的厚度正好能在O光與E光之間引起90度的位相差，就能把偏振方向的線偏振光“變成”圓偏振光。因此我們稱其為四分之一波片。如果這種介質(zhì)的厚度引起了180度的位相差，就會使入射的線偏振光“轉(zhuǎn)過”了90度（下圖）。我們稱其為半波片。前面說過，圓偏振濾鏡就是由線偏振鏡加上一塊四分之一波片組成的，而且，線偏振鏡的偏振方向與四分之一波片的O光（或E光）成45度的。

A02B-0200-B503 

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