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9.0 Splitting a Lens

9.0 Splitting a Lens - THE UNIVERSITY OF CENTRAL FLORIDA...

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FALL Semester 10 THE UNIVERSITY OF CENTRAL FLORIDA OSE 6265 9.0 Splitting a Lens James E. Harvey, Instructor 9.0

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9.1 Introduction 9.1 In Chapter 3 and its homework, you learned how to minimize spherical aberration by lens bending, and eliminating it by using an aspheric surface. The operands SPHA and TRAC were used in the merit function to accomplish this. In this chapter we will study “lens splitting as a means of achieving diffraction-limited performance on-axis. Practical use of this technique can be found in “transmission spheres” in Fizeau interferometry, and in lithographic lenses. A homework exercise will be assigned on the Fizeau interferometry application.
9.2 Demonstration of Lens Splitting 9.2 Start with a slab of glass 13mm thick. Set entrance pupil to 40 mm diameter. Set EFFL target to 100mm, weight 1. Set SPHA target to zero, weight zero. Place stop at front lens surface. Vary both curvatures and BFD. Optimize with default merit function. (Example1o1b)

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Lens Splitting Demonstration (Example1o1a) 9.3 W 040 = 62.3583 λ
(Example1o2b) 4 Insert six dummy surfaces as shown. Keep front and back curvatures fixed. Make three 1 mm air gaps in lens. Vary curvatures only on surface 2 and 9.

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9.0 Splitting a Lens - THE UNIVERSITY OF CENTRAL FLORIDA...

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