Optics: measuring and testing – By polarized light examination – With light attenuation
Reexamination Certificate
2007-03-27
2007-03-27
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By polarized light examination
With light attenuation
C356S364000
Reexamination Certificate
active
10877777
ABSTRACT:
Preferred embodiments of the present invention are directed at limiting power and controlling an output intensity of an optical system using photo-induced anisotropic materials. In a preferred embodiment, an azobenzene polymer film is used. The embodiments in accordance with the present invention include a cross-polarization system to provide clamping of the output intensity.A system for limiting power in accordance with a preferred embodiment of the present invention, includes a light source that provides an input light beam along a first optical path, a first polarizing element having a first polarization state positioned in the first optical path, a second polarizing element positioned in the first optical path having a second polarization state substantially orthogonal to the first polarization state, a sample having a photo-induced anisotropic material positioned in the first optical path, and a polarizer positioned in a second optical path at an angle of approximately 45 degrees to that of the input beam wherein an excitation beam provided in the second optical path spatially overlaps the input beam on the sample, and an output beam that is generated has a limited transmission value at high intensity.
REFERENCES:
patent: 6606181 (2003-08-01), Patel et al.
Wu et al., “Optical Power Limiting With Photoinduced Anisotropy Of Azobenzene Films,” Applied Optics, vol. 42, No. 22, Aug. 1, 2003.
Frey et al., “Optical Limitation In Resonant Faraday Media,” Optical Letters, vol. 25, No. 11, Jun. 1, 2000.
Dovgalenko et al., “Optically Induced Birefringence In Bacteriorhodopsin As An Optical Limiter,” Appl. Phys. Lett. 68 (3), Jan. 15, 1996.
Philip Reji
Rao Devulapalli V. G. L. N.
Wu Pengfei
Punnoose Roy M.
Toatley , Jr. Gregory J.
University of Massachusetts
Weingarten Schurgin, Gagnebin & Lebovici LLP
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