josa_2010_v27_i7

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This paper was published in the Journal of the Optical Society of America and is made available as an electronic reprint with the permission of OSA. The paper can be found at the following URL on the OSA website:

http://www.opticsinfobase.org/josaa/viewmedia.cfm?URI=josaa-27-7-1620&seq=0

Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.

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