Schott SF L57, 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	1.88742326E+00;
B2	3.60534025E-01;
B3	2.26189313E+00;
C1	1.45939341E-02;
C2	6.48198946E-02;
C3	1.76062211E+02;