Optics: measuring and testing – By polarized light examination
Reexamination Certificate
2006-07-18
2006-07-18
Toatley, Jr., Gregory J. (Department: 2877)
Optics: measuring and testing
By polarized light examination
C356S367000, C356S368000, C356S369000
Reexamination Certificate
active
07079246
ABSTRACT:
An improved method and apparatus for the measurement of the polarization of light uses nonlinear polarimetry. The higher order moments of the E field are measured and then transformed into standard polarimetry parameters yielding the polarization of the light. In a first embodiment, the light to be measured is transmitted through a rotating retarder. The retarder is optically coupled to a fixed analyzer and light is then detected by linear and nonlinear photodetectors. The spectra from the detectors is calculated and transformed, to obtain the polarization. In a second embodiment, the light to be measured is received by an optical fiber comprising a plurality of fiber birefringences to retard the light. Polarization sensitive gratings along the length of the fiber scatter the light, and photodetectors detect the scattered light. Apparatus in two preferred embodiments can perform the inventive method.
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patent: 6211957 (2001-04-01), Erdogan et al.
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patent: 2003/0067602 (2003-04-01), Patel et al.
Lucent Technologies - Inc.
Punnoose Roy M.
Toatley , Jr. Gregory J.
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