Abstract

We measure and stabilize the relative angle of parallel and antiparallel laser beams to 5nradHz resolution by comparing the phases of radio frequency beat notes on a quadrant photodetector. The absolute accuracy is 5.1 and 2.1μrad for antiparallel and parallel beams, respectively, which is more than 6 and 16 times below the Rayleigh criterion.

© 2005 Optical Society of America

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