Schott SF 13, 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	1.65582508E+00;
B2	2.57423297E-01;
B3	1.09216931E+00;
C1	1.31676446E-02;
C2	6.04328022E-02;
C3	1.16322468E+02;