Schott SSK N5, 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	1.59222659E+00;
B2	1.03520774E-01;
B3	1.05174016E+00;
C1	9.20284626E-03;
C2	4.23530072E-02;
C3	1.06927374E+02;