Schott SF 59, 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	2.05775824E+00;
B2	5.28644661E-01;
B3	1.00043574E+00;
C1	1.67799599E-02;
C2	6.55335804E-02;
C3	1.10002549E+02;