Method of noise cancellation in an unpolarized-laser instrument

Details Method of noise cancellation in an unpolarized-laser instrument Method of noise cancellation in an unpolarized-laser instrument

2006-07-18

2006-07-18

Pham, Hoa Q. (Department: 2877)

Optics: measuring and testing

By particle light scattering

With photocell detection

C356S343000, C356S364000

Reexamination Certificate

active

07079243

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 so that the first detector has the same sensitivity to polarization as a second detector positioned at a second angle with respect to the laser beam axis. This corrected signal is then subtracted from the signal at the second detector which detects a desired signal.

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