Schott BaF 50, 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	1.63007175E+00;
B2	1.35169289E-01;
B3	1.15329734E+00;
C1	1.00982735E-02;
C2	4.54580137E-02;
C3	1.21435251E+02;