Schott LaF 13, 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	1.81139531E+00;
B2	2.48608825E-01;
B3	1.10753882E+00;
C1	1.06588376E-02;
C2	4.67089164E-02;
C3	9.16857805E+01;