Schott SF 9, 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	1.41373875E+00;
B2	2.41835903E-01;
B3	1.01292278E+00;
C1	1.05642379E-02;
C2	4.90126431E-02;
C3	1.17884362E+02;