Retrofocus Optics For The Focussing Of CO[sub]2[/sub] - Laser Radiation: A Comparison Between Designs Using Spherical Optics And Aspherics

L. H. J. F. Beckmann; J. L. F. de Meijere

doi:10.1117/12.950064

24 March 1989 Retrofocus Optics For The Focussing Of CO₂ - Laser Radiation: A Comparison Between Designs Using Spherical Optics And Aspherics

L. H. J. F. Beckmann, J. L. F. de Meijere

Author Affiliations +

Proceedings Volume 1020, High Power CO2 Laser Systems and Applications; (1989) https://doi.org/10.1117/12.950064
Event: 1988 International Congress on Optical Science and Engineering, 1988, Hamburg, Germany

Abstract

In applications of high power CO2-lasers which require very high power concentration and thus wide aperture focussing optics, the use of retrofocus type optical systems is advantageous in that it allows relatively long distances between the focus and the last optical surface. Relative apertures around f/1.2 have been achieved with diffraction limited systems consisting of a single negative and (symmetrical) dual positive lens elements made from ZnSe. An alternative approach combines the dual positive lenses in to a single aspheric element. The practical consequenses and tradeoffs are discussed.

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L. H. J. F. Beckmann and J. L. F. de Meijere "Retrofocus Optics For The Focussing Of CO₂ - Laser Radiation: A Comparison Between Designs Using Spherical Optics And Aspherics", Proc. SPIE 1020, High Power CO2 Laser Systems and Applications, (24 March 1989); https://doi.org/10.1117/12.950064

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