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These dual wavelength multiple order waveplates are madewaveplate5 a piece of quartz which has been precisely polished. Its thickness is controlled to provide half wave retardation at one wavelength and full wave retardation at a second wavelength.
They are offered for Nd:YAG harmonic wavelengths and can be used to separate the harmonic beams by means of a change in their state of polarization. A half wave plate has a net retardation of π and rotates the plane of polarization by 90°.
A full wave plate has a net retardation of 2π and rotates the plane of polarization by 180°. The two harmonics will therefore emerge with crossed linear polarizations.