Schott BaF N13, 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	1.57068590E+00;
B2	1.51295152E-01;
B3	1.07638026E+00;
C1	9.39377487E-03;
C2	4.49479866E-02;
C3	1.13934126E+02;