| 摘要 |
An optical switch switches ports through which a beam is input and output and includes an optical system through which the beam passes; a movable reflector that is enclosed in a casing and reflects, at a variable angle, the beam that has passed through the optical system; and a transmissive window that is disposed in the casing at a position through which the beam passes, is made of a uniaxial crystal, and obtains a phase difference with respect to the beam passing therethrough having a wavelength lambda. The phase difference is lambda/4 times a positive odd integer and results from a setting of an orientation of a crystal axis and a thickness of the transmissive window.
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