User Defined Gradient Index Method
The second method of thermo-optic analysis in SigFit generates input for the user defined gradient index lens capability in the optical analysis. In this technique SigFit generates a three-dimensional representation of the disturbed refractive index profile to be used in conjunction with a dynamic link library provided with SigFit to allow the optical analysis to obtain the index of refraction anywhere in each lens. This method has greater accuracy compared to the OPD integration method but is significantly more computationly intensive.
Figure 4 – The user defined gradient index method of thermo-optical analysis generates a database of the three-dimensional refractive index profile accessible by optical analysis software during ratracing through a Sigmadyne supplied dynamic link library.