Schott BaSF 57, 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	1.47160842E+00;
B2	1.90746436E-01;
B3	1.04759046E+00;
C1	9.15435575E-03;
C2	4.44771291E-02;
C3	1.10563253E+02;