Polarized Light Source for Underwater Use.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to a circularly polarized underwater light source comprising a conventional unpolarized light source with a well-collimated output an efficient optical polarizer, which employs multilayer interference polarization, total internal reflection, birefringent quarter-wave plates and anti-reflection coatings a lens to control the extent of the divergence of the illuminating beam and an underwater housing with a dome-shaped window designed to withstand external hydrostatic pressures, part of the winding forming the lens.
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