| Abstract: A temperature insensitive (athermal) channeled spectropolarimeter (CSP)
is described. The athermal CSP includes a crystal retarder formed of a
biaxial crystal. The crystal retarder has three crystal axes, wherein
each axis has its own distinct index of refraction. The axes are oriented
in a particular manner, causing an amplitude modulating carrier frequency
induced by the crystal retarder to be thermally invariant. Accordingly, a
calibration beam technique can be used over a relatively wide range of
ambient temperatures, with a common calibration data set. |
| Filed: 2/27/2014 |
| Application Number: 14/192543 |
| This invention was made with Government support under Contract No. DE-NA0003525 awarded by the United States Department of Energy/National Nuclear Security Administration. The Government has certain rights in the invention. |
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