Schott SF 6, 365nm - 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	1.72448482E+00;
B2	3.90104889E-01;
B3	1.04572858E+00;
C1	1.34871947E-02;
C2	5.69318095E-02;
C3	1.18557185E+02;