Achromatic wave plates are useful in various mid-IR applications, such as analyzing or controlling the spectrum
available from CO2 and other lasers, and for the study of IR spectra from distant stars. Their production relies upon the
technical skills of those who grow the required high quality crystals and upon those who fabricate the optical parts to the
Two materials are described - one useful for light in the spectral range of the visible through the near IR and another that
functions well in mid-IR applications from 2.5 μm to 11.5 μm. Some limitations imposed by inherent material properties
will also be discussed.
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J. Donald Beasley and Philip D. Marlowe
Achromatic wave plates for the mid-infrared
", Proc. SPIE 8364, Polarization: Measurement, Analysis, and Remote Sensing X, 83640I (June 8, 2012); doi:10.1117/12.919230; http://dx.doi.org/10.1117/12.919230