Schott TiF 3, 365nm - 2325nm
USER
2 1
SQRT(1+B1*wvl^2/(wvl^2-C1)+B2*wvl^2/(wvl^2-C2)+B3*wvl^2/(wvl^2-C3))
0
B1	1.22927703E+00;
B2	1.16802717E-01;
B3	1.05306668E+00;
C1	8.52950666E-03;
C2	5.28174592E-02;
C3	1.17616359E+02;