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Submitted on: 18 April 1999.
Revised on: 28 June 1999.
Accepted on: 24 July 1999.
___________________APL Photonics---AIP PUBLISHING
Submitted on: 10 February 2018.
Revised on: 08 June 2018.
Accepted on: 25 July 2018.
___________________APL Photonics---AIP PUBLISHING
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