Schott LaF 9, 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	1.75303976E+00;
B2	3.42145763E-01;
B3	1.04243134E+00;
C1	1.25249595E-02;
C2	5.47228047E-02;
C3	1.04326262E+02;