Schott TiF 6, 405nm - 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	1.40069329E+00;
B2	1.34903418E-01;
B3	9.24097449E-01;
C1	1.09426015E-02;
C2	7.08666547E-02;
C3	9.94792445E+01;