Title:	Systems and Methods for Limiting Power using Photo-induced Anisotropy
Authors:	Wu, Pengfei Philip, Reji Rao, Devulapalli V G L N
Keywords:	Appl. No.: 10/877,777
Issue Date:	27-Mar-2007
Publisher:	United States Patent
Citation:	United States Patent, 2007, 7196794B2
Series/Report no.:	United States Patent;US 7,196,794 B2
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 polar ization 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.
URI:	http://hdl.handle.net/2289/8473
Copyright:	2007
Additional information:	Filed: Jun. 25, 2004 ; Assignee: University of Massachusetts, Boston, MA (US)
Appears in Collections:	Patents

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