Proceedings ArticleDOI
Laser Beam Expander-A New Design
David R. Shafer
- Vol. 0190, pp 15-20
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TLDR
In this paper, the authors described a laser beam expander that was unobscured, corrected for spherical aberration, coma, and astigmatism, and consisted of four spherical mirrors.Abstract:
In 1978 the author described a laser beam expander that was unobscured, corrected for spherical aberration, coma, and astigmatism, and consisted of four spherical mirrors. It was not corrected for Petzval curvature, however; therefore the expanded laser beam would defocus slightly if the input beam were not aligned to the system correctly. This paper describes a new design that has just three mirrors, one an aspheric, and that is corrected for spherical aberration, coma, astigmatism, and Petzval curvature. It is also unobscured, and has the very nice feature that the one aspheric mirror is used in a centered fashion: no off-axis section of an aspheric mirror needs to be made. The new design can be realized in any beam expansion ratio that is desired, but performance suffers at very high magnifications. Two representative designs, 4X expansion and 8X expansion, will be shown and discussed, and their performance numbers will be given.read more
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