Schott SF 4, 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	1.61957826E+00;
B2	3.39493189E-01;
B3	1.02566931E+00;
C1	1.25502104E-02;
C2	5.44559822E-02;
C3	1.17652222E+02;