Schott BaSF 12, 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	1.54701890E+00;
B2	1.68942059E-01;
B3	9.74756333E-01;
C1	1.02837719E-02;
C2	4.96949620E-02;
C3	1.11173296E+02;