Optical Design Study 6
Aspheric Systems
- Design an f/2 singlet lens with focal length of 50 mm using one aspheric
surface. Use the conic constant and two curvatures to control spherical
aberration, coma, and focal length. Optimize for monochromatic operation
at 632.8 nm and 0.5 degree half field of view. Use three fields
for optimization (0, 0.1, and 0.5 degree).
Provide a listing of fabrication data, including the aspheric sag table with
best-fitting-sphere enabled.
- Layout a two mirror system with an effective focal length of 100 mm,
a mirror separation of 20 mm, a back focal distance of 30 mm, and
a half field-of-view of 0.5 degree. Use three fields
for optimization (0, 0.1, and 0.5 degree).
- Primary elliptical, secondary is spherical (Dall-Kirkham). Use
ZEMAX optimizer to choose the conic constant of the primary.
- Primary parabolic, secondary hyperbolic (Cassegrain). Use
ZEMAX to choose the conic constant.
- Optimize the conic constant of both mirrors (Richey-Chretien).
You can obtain diffraction-limited performance on-axis by setting the
number of fields to one, and re-optimizing on-axis. Otherwise you will
obtain a compromise between on-axis and off-axis performance. There is
no control over astigmatism on any of these systems, so the useful field
of view is small.
For each system, provide
- a full listing of surface data
- a drawing of the system
- rms spot size vs. field
- ray fans
- field plot
- spot diagrams at the best focal plane. Be sure to document the rms spot sizes.
- spot diagrams through focus.
- MTF plots at all fields.
Maintained by
John Loomis, last updated 7 July 2012