Schott SF L56, 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	1.75126105E+00;
B2	3.01566630E-01;
B3	1.89211398E+00;
C1	1.33187209E-02;
C2	6.21436403E-02;
C3	1.57884093E+02;