Active sub-Rayleigh alignment of parallel or antiparallel laser beams
Optics
2009-11-11 v2 Atomic Physics
Abstract
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.
Cite
@article{arxiv.physics/0507039,
title = {Active sub-Rayleigh alignment of parallel or antiparallel laser beams},
author = {Holger Mueller and Sheng-wey Chiow and Quan Long and Christoph Vo and Steven Chu},
journal= {arXiv preprint arXiv:physics/0507039},
year = {2009}
}
Comments
References added; to appear in Optics Letters. 3 pages, 4 figures