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Zemax 10 Design a Doublet

This video builds upon the knowledge of how to solve for crown and flint focal lengths (or radii if shape factor is selected). But these are a thin lens solution. Zemax can be used to maintain the achromatic condition, focal length and add lens thickness. This video shows you how.


Can this be done as a video game without using equations? Yes and it is shown here. This is Zemax video 10A and previewing it may hamper your learning process,

1.Input an F/4, 78 mm achromatic lens made of N-BK7, N-SF6 into Zemax. First solve for the Radius for equi-curvature. What are the crown and flint focal lengths? The intent is to have a pen and paper solution via equations, input into Zemax. Assume zero lens thickness. Assume air in between crown and flint with zero thickness per the equations in the tutorial video. Do not optimize the radii.

2.What are the two radii of curvature?

3.What is the secondary color?

4.Make the crown 10 mm thick and the flint 5 mm thick. Optimize while maintaining an achromatic solution. What are the two radii of curvature? This is intentionally open ended. The goal is to have a manufacturable, bonded, achromatic solution. This problem is intended to explore the design process: do you thicken the lens first? Do you vary all radii first? Do you bond the crown and flint first? Solutions will vary depending on student approach. This is also intended to show the beauty of lens design!

5.Design a 50 mm, F/10 achromatic lens made of S-FPL53 and S-BSM81 in Zemax. Calculate the difference in red-blue focus to green focus. Why is the secondary color so “different”? Minimum solution will be a zero thickness (thin lens solution). Extra credit for a fully manufacturable bonded achromat.

Solutions here.
Subpages (1): Achromat Video Game
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