Document Type

Article

Publication Date

4-1975

Journal Name

Journal of the Optical Society of America (1917-1983)

Comments

This paper was published in Journal of the Optical Society of America (1917-1983) 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/josa/abstract.cfm?URI=josa-65-4-462. 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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