Schott SF 11, 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	1.73848403E+00;
B2	3.11168974E-01;
B3	1.17490871E+00;
C1	1.36068604E-02;
C2	6.15960463E-02;
C3	1.21922711E+02;