Submitted on: 18 July 2008.
Revised on: 20 August 2008.
Accepted on: 15 October 2008.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
Submitted on: 25 November 2000.
Revised on: 21 January 2001.
Accepted on: 18 March 2001.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
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Submitted on: 04 May 2000.
Revised on: 06 August 2000.
Accepted on: 18 September 2000.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
Submitted on: 17 April 2002.
Revised on: 10 July 2002.
Accepted on: 29 July 2002.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
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