Schott BaSF 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	1.63872281E+00;
B2	1.84589266E-01;
B3	1.00747347E+00;
C1	9.93238976E-03;
C2	4.62893289E-02;
C3	8.16163799E+01;