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GeomOpt_Part42 - Geometric Geometric aberrations part II In...

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Geometric aberrations part II In the previous class we introduced the concept of the In the previous class we introduced the concept of the aberration polynomial and studied spherical aberration. In this class we will continue our treatment of b ti b id i th th 4 b ti aberrations by considering the other 4 aberrations – namely coma, astigmatism, field curvature and distortion. ©AGK 2010 Aberrations 29
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Part II: Learning outcomes After taking this section you will be able to: Sketch ray paths for systems suffering from – Coma A ti ti – Astigmatism Field curvature – Distortion Distortion Apply the best form lens equations for spherical aberration Recognize the importance of the Abbe Sine Condition Propose some solutions to these problems ©AGK 2010 Aberrations 30
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Content Review of the Seidel aberration polynomial Five third order aberrations: Spherical Aberration C – Coma – Astigmatism – Field curvature Field curvature – Distortion ©AGK 2010 Aberrations 31
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Review: Spherical aberration for a lens Positive spherical aberration marginal ray F i T•SA paraxial image plane L•SA L•SA: longitudinal spherical aberration ©AGK 2010 Aberrations 32 T•SA: traverse (lateral) spherical aberration
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