Research Papers in Physics and Astronomy


Date of this Version



Published in Applied Optics 47:13 (May 1, 2008), pp. 2465–2469. Copyright © 2008 Optical Society of America. Used by permission.


A method for the active feedback reduction of optical instrumental intensity asymmetries is presented. It is based on the fast chopping of two spatially separated beams of light with orthogonal linear polarizations that are recombined and passed through a quarter-wave plate to yield a single beam with rapidly flipping helicity. Active electro-optic feedback has been successfully employed to maintain this asymmetry below 10−5.

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