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Submitted on: 06 October 2000.
Revised on: 23 October 2000.
Accepted on: 06 November 2000.
Photonics Research
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Submitted on: 09 July 2011.
Revised on: 31 July 2011.
Accepted on: 17 August 2011.
Photonics Research
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Submitted on: 23 November 2014.
Revised on: 31 December 2014.
Accepted on: 24 January 2015.
Photonics Research---CHINESE LASER PRESS