Submitted on: 28 April 1998.
Revised on: 25 August 1998.
Accepted on: 29 September 1998.
___________________Journal of the European Optical Society-Rapid Publications
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Submitted on: 22 July 2013.
Revised on: 29 October 2013.
Accepted on: 16 December 2013.
___________________Journal of the European Optical Society-Rapid Publications
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Submitted on: 04 April 2016.
Revised on: 30 May 2016.
Accepted on: 07 July 2016.
___________________Journal of the European Optical Society-Rapid Publications
Submitted on: 31 July 2022.
Revised on: 09 November 2022.
Accepted on: 09 December 2022.
___________________Journal of the European Optical Society-Rapid Publications
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