Schott BaF 9, 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	1.51018771E+00;
B2	1.33636807E-01;
B3	9.53993948E-01;
C1	9.18095301E-03;
C2	4.16449600E-02;
C3	1.08048765E+02;