| 摘要 |
PROBLEM TO BE SOLVED: To solve such a problem that in a conventional half-wave plate, the width of a wave length band exhibiting 0-100% PS conversion efficiency in a transmitted light band is extremely narrow, consequently a half-wave plate must be formed in which difference in thickness between birefringent plates is changed for each wave length band exhibiting a prescribed PS conversion efficiency. SOLUTION: In the half-wave plate formed by sticking a plurality of the number of the birefringent plates, the half-wave plate is characterized in that the principal surfaces of four birefringent plates each made of quartz are stuck to each other and the thickness ratio among respective birefringent plates is 1:2:1:1 from the birefringent plate of the incident or the outgoing light side. COPYRIGHT: (C)2008,JPO&INPIT
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