Optical Design Study 1
Doublet lens
- Design an f/4 achromatic N-SK4/N-SF5 doublet lens with focal
length 50 mm and 4-degree half field-of-view.
Find both solutions with the crown element in front. Comment on the
relative merits of each design.
- Make the position of the stop a variable and design a
“landacape lens” achromatic doublet. Discuss the
performance of this design compared to the doublet with the stop
at the first surface.
- If your Fraunhoffer lens is “almost” cemented, remove
the air interface (surface 2) and reoptimize. Comment on the relative
merits of this design compared to the “separated”
lens Fraunhoffer design.
- Analyze at least one of your designs in MATLAB by generating a diagram of your
lens, a paraxial raytrace, and a table of Seidel wavefront
aberrations. The results should match ZEMAX.
See the example MATLAB
script.
- The MATLAB lens drawing is designed to be solid-shaded. Paste
your drawing into Powerpoint, convert to a Microsoft drawing object
(by ungrouping), right click on each lens and make a closed curve.
Then set object properties to make a solid outline and filled
interior. See these example lens
drawings.
For each lens design, submit your .ZMX file and provide
a report with the following information:
- drawing of the lens
- a full listing of lens data
- chromatic focal shift
- rms spot radius vs. field
- a rayfan analysis figure
- field curvature/distortion figure
- a spot diagram figure (through focus)
- paraxial raytrace
- Seidel wavefront aberration table
See the example: Achromatic
doublet design
Maintained by
John Loomis, last updated 23 May 2012