Temperature-dependent refractive index data may be fit to the ZEMAX thermal model using the Glass Fitting Tool. As there are a significant number of free parameters available to the user (six coefficients are available in the model), accurate fits to the data are generally obtained.

References

1
Bradley J. Frey, Douglas B. Leviton, and Timothy J. Madison, Optomechanical Technologies for Astronomy, Proc. of SPIE, Vol. 6273, p. 62732J-1.