halfwave plate造句

• Two Fresnel rhombs can be used in tandem ( usually cemented to avoid reflections at their interface ) in order to achieve the function of a halfwave plate.
• Such a polarization controller can for example be obtained by placing on the optical path three rotatable waveplates in cascade : a first quarterwave plate, which is oriented to transform the incident elliptical polarization into linear polarization, a halfwave plate, which transforms this linear polarization into another linear polarization, and a second quarterwave plate, which transforms the other linear polarization into the desired elliptical output polarization.