Fall 2007
Optical Sciences 421/521 Homework 1
OPTI 421/521 – Introductory Opto-Mechanical Engineering
Homework 5: Specification of optical components
There are two parts to this. Each part should have its own report.
Undergraduate students can work in pairs for this assignment, jointly submitting reports
for part A and part B.
Part A) Understanding specifications for stock lenses
Look at catalogs or web sites from companies that supply optical components. Choose a lens, a
mirror, and a prism. For each:
Write the complete specification (as given in the catalog)
Give the tolerances published for this element.
Provide a brief explanation for each of the tolerances.
(What does it mean? How does it affect optical performance?)
Part B) Tolerancing optical lenses
For the doublet from HW 4, develop a tolerance analysis for the optical elements which
contributes less than 0.04 λ rms to the system wavefront error budget. Errors should include:
Surface radii of curvature
Lens thickness
Wedge
Surface irregularity
Refractive index error
Refractive index variation (inhomogeneity)
Assume focus compensation as you did for HW4.
You should use a ray trace program such as Zemax, CodeV, Oslo, to determine the sensitivities
for the geometric parameters. You can use rules of thumb and calculations to determine the affect
of surface figure and index variations. Then create a spreadsheet to help set the tolerances to
sensible values. If you do not have access to a ray trace program, Dr. Burge can provide the
sensitivities.
Specify the tolerances so that the lenses could be manufactured. Specify the grade of glass so it
could be purchased from Schott.
You should write a report called “Lens requirements for focusing doublet.”