Submitted on: 11 January 2000.
Revised on: 08 February 2000.
Accepted on: 28 February 2000.
___________________JOURNAL OF OPTICAL TECHNOLOGY---OPTICA PUBLISHING GROUP
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Submitted on: 19 September 2012.
Revised on: 01 November 2012.
Accepted on: 11 November 2012.
___________________JOURNAL OF OPTICAL TECHNOLOGY---OPTICA PUBLISHING GROUP
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