Active sub-Rayleigh alignment of parallel or antiparallel laser beams

Details Active sub-Rayleigh alignment of parallel or antiparallel laser beams Active sub-Rayleigh alignment of parallel or antiparallel laser beams

2005-07-06

arxiv.org/abs/physics/0507039v2

Optics Letters 30, 3323 (2005)

Physics

Optics

References added; to appear in Optics Letters. 3 pages, 4 figures

Scientific paper

10.1364/OL.30.003323

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

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