Title:
METHOD OF NOISE CANCELLATION IN AN UNPOLARIZED-LASER INSTRUMENT
Document Type and Number:
WIPO Patent Application WO2004007017
Kind Code:
A3
Abstract:
A method of noise reduction in a system where polarization mode fluctuations contribute to the noise in a signal is provided. Specifically, a corrected signal is formed by adjusting the relative and overall intensity of the orthogonal polarization components of an unpolarized laser source at a first detector positioned at a first angle with respect to the laser beam axis (20) so that the first detector (80) has the same sensitivity to polarization as a second detector (80) positioned at a second angle with respect to the laser beam axis (20). This corrected signal is then subtracted (100) from the signal at the second detector which detects a desired signal.
Inventors:
SANDBERG JON C
TURCHETTE QUENTIN A
TURCHETTE QUENTIN A
Application Number:
PCT/US2003/022307
Publication Date:
May 21, 2004
Filing Date:
July 16, 2003
Export Citation:
Assignee:
RES ELECTRO OPTICS INC (US)
International Classes:
G01J1/04; G01J1/08; G01J1/42; G01J4/00; G01N15/02; G01N15/14; G01N21/00; A61N; (IPC1-7): G01N15/02; G01N15/14; G01J4/00
Foreign References:
| US6061132A | 2000-05-09 | |||
| US4893928A | 1990-01-16 | |||
| US5331404A | 1994-07-19 |
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