William Angerer - Department of Physics and Astronomy - University ...

Appendix F
Code for Fitting Index of Refraction to Transmission Data
The following is a listing of the code used to extract the index of refraction of Ga~
from the transmission data through GaN / Ah03 . This prograrr. is a variation of
the amoeba. c simplex optimization program found in Numerical Recipes in C [120j.
The program performs a least squares fit of the transmission data to the calculated
transmission of of light through GaN /A1 2 0 3 (see section -1.2.2). I have used a variation
of this program for all of the curve fitting and analysis in this thesis. I have found
this routine to be very robust and have not had any problems with convergence to
local minimum. as opposed to global minimum. I have verified this by changing the
starting point of the fit and observing convergence to the same fitting value.
The code is compiled as
g++ fit_n.cpp ranO.c nrutil.c -1m -0 fit_n
and the code is execut0d as
unix_prompt> fit_n
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