| 摘要 |
As a 1/2 wave plate constituted by laminating two wave plates, a wave plate where temperature dependence of a phase difference is reduced is provided. In a wave plate constituted by laminating a first wave plate having a phase difference tau1 (deg.) and an optical axis azimuth theta1 (deg.), and a second wave plate having a phase difference tau2 (deg.) and an optical axis azimuth theta2 (deg.), the phase difference tau1 (deg.) of the first wave plate and the phase difference tau2 (deg.) of the second wave plate are set to 360n+180 (n=0, 1, 2 . . . ), and an angle formed by polarization planes of incident light and emitted light is theta (deg.). In this case, the first wave plate and the second wave plate are laminated so as to satisfy theta1=(90+theta/2)/2 and theta2=theta1+90theta/2.
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