Schott BaF 4, 334nm - 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	1.37492590E+00;
B2	1.46354500E-01;
B3	9.12643359E-01;
C1	9.29554343E-03;
C2	4.40426654E-02;
C3	1.16607899E+02;