Schott SF 55, 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	1.64681240E+00;
B2	3.31540164E-01;
B3	1.02465769E+00;
C1	1.28731296E-02;
C2	5.64818124E-02;
C3	1.16270992E+02;