Optical: systems and elements – Polarization without modulation – Polarizarion by dichroism
Patent
1994-04-05
1998-12-08
Spyrou, Cassandra C.
Optical: systems and elements
Polarization without modulation
Polarizarion by dichroism
359483, 372100, G02B 530
Patent
active
058478710
ABSTRACT:
Optical apparatus that combines a plurality of separate optical functions into a single monolithic optical element. The the optical element comprises two or three optical functions, such as saturable absorption, retroreflection, and polarization rotation. The optical element comprises a body that is formed in the shape of a right-angle porro prism. The optical element is fabricated from a garnet material that combines the properties of high refractive index (greater than 1.414 to permit total internal reflection at a 45 degree incidence angle), saturable optical absorption (to provide Q-switching), and tolerance to high temperatures (to permit application of anti-reflection coatings). The optical element may be comprised of garnet materials such as yttrium aluminum garnet, gadolinium scandium gallium garnet, or gadolinium scandium aluminum garnet, for example. Doping the garnet materials with tetravalent chromium (Cr.sup.4+), for example, provides for saturable absorption while the natural properties of garnet materials provide high temperature tolerance.
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Patent Abstracts of Japan, unexamined applications, P field, vol. 16, No. 46, Feb. 5, 1992, The Patent Office Japanese Government, p. 70 P 1307; & JP-A-03 249 606.
Jones Dennis C.
Sumida David S.
Alkov Leonard A.
Lenzen, Jr. Glenn H.
Raufer Colin M.
Raytheon Company
Schuberg Darren E.
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