Schott LaF N28, 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	1.75882549E+00;
B2	3.15197670E-01;
B3	1.19029675E+00;
C1	8.72810026E-03;
C2	2.93020832E-02;
C3	8.51780644E+01;