We have measured the linear polarization induced in a beam of submillimeter radiation when it is obliquely reflected by a flat mirror made of aluminum alloy. For angles of incidence in the range 15°–45°, we measured induced polarizations in the range 0.05%–0.25%. Our measurements are within a factor of 2 of theoretical predictions. We conclude that astronomical telescopes that incorporate oblique reflections from good conductors will not introduce spurious polarizations large enough to cause significant problems for submillimeter polarimetric observations.
© 1998 Optical Society of America
(120.5410) Instrumentation, measurement, and metrology : Polarimetry
(120.5700) Instrumentation, measurement, and metrology : Reflection
(350.1260) Other areas of optics : Astronomical optics
Tom Renbarger, Jessie L. Dotson, and Giles Novak, "Measurements of Submillimeter Polarization Induced by Oblique Reflection from Aluminum Alloy," Appl. Opt. 37, 6643-6647 (1998)