Optical: systems and elements – Polarization without modulation – By relatively adjustable superimposed or in series polarizers
Patent
1997-04-17
1999-07-13
Spyrou, Cassandra
Optical: systems and elements
Polarization without modulation
By relatively adjustable superimposed or in series polarizers
359496, 359497, 359629, 359638, G02B 530
Patent
active
059234709
ABSTRACT:
An improved polarization beam splitter formed by a collimator and two similarly shaped, birefringent crystal prisms is provided. The light from the collimator is incident upon the first face of the first birefringent crystal prism which also has second and third faces. The collimated light is incident upon the second face at an angle .phi. with respect to a line normal to the second face so that light polarized perpendicular to a plane of incidence upon the second face is reflected toward the third face and light polarized in the plane of incidence is refracted at the second face. The second birefringent crystal prism has a second face parallel to, and in close proximity with, the second face of the first birefringent prism so that light refracted at the second face of said first prism is refracted at the second face of the second prism and into the second prism. A first face of the second prism is positioned with respect to its second face so that light refracted into the second prism is refracted at the first face from the second prism cross-sectionally undistorted with respect to a cross-section of the light polarized in the plane of incidence at the second face of the first prism. This polarization beam splitter can handle high power without distorting the beam.
REFERENCES:
patent: 3720457 (1973-03-01), Swartz et al.
A. Shibukawa et al. "Compact Optical Circulation for Near-Infrared Region," Electronics Letters, vol. 14, No. 25, Dec. 1998, pp. 816-817.
Hecht, "Optics," 2nd Ed. Addison-Wesley Publishing Co., Inc., 1987, pp. 288-292.
Huang Yonglin
Pan J. J.
Zhang Kai
E-Tek Dynamics, Inc.
Schuberg Darren E.
Spyrou Cassandra
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