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Midfocus matching: a method for calculating lens positions for a Gaussian beam in a two-lens system

Freek Keijzer, Rob J. W. E. Lahaye, and Steven Stolte

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Abstract

For the situation in which a specific laser beam waist is required at a certain position, we develop a practical method of selecting focal lengths for a combination of two lenses and of calculating their positions. The method provides, in an easy graphical way, the solution of this two-lens focusing problem of Gaussian beams by finding the crossing point of two parametric curves.

© 1992 Optical Society of America

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