Schott BaF 52, 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	1.41632142E+00;
B2	1.17331190E-01;
B3	9.34114782E-01;
C1	9.28783144E-03;
C2	4.49910150E-02;
C3	1.14125561E+02;