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Submitted on: 15 May 1998.
Revised on: 04 September 1998.
Accepted on: 03 November 1998.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
Submitted on: 19 January 2004.
Revised on: 01 April 2004.
Accepted on: 23 April 2004.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP
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http://reply.papertrans.cn/1/23/2246/2246-35.png
Submitted on: 20 September 2015.
Revised on: 15 December 2015.
Accepted on: 04 February 2016.
___________________APPLIED OPTICS---OPTICA PUBLISHING GROUP