Submitted on: 05 December 1999.
Revised on: 02 April 2000.
Accepted on: 23 April 2000.
___________________Journal of Physics-Photonics---IOP PUBLISHING LTD
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Submitted on: 12 May 2002.
Revised on: 19 August 2002.
Accepted on: 09 September 2002.
___________________Journal of Physics-Photonics---IOP PUBLISHING LTD
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Submitted on: 28 March 2002.
Revised on: 13 July 2002.
Accepted on: 25 August 2002.
___________________Journal of Physics-Photonics---IOP PUBLISHING LTD
Submitted on: 05 July 2022.
Revised on: 04 September 2022.
Accepted on: 12 October 2022.
___________________Journal of Physics-Photonics---IOP PUBLISHING LTD