Schott BaF 3, 334nm - 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	1.32064267E+00;
B2	1.33572683E-01;
B3	8.85521821E-01;
C1	8.87798715E-03;
C2	4.20290346E-02;
C3	1.11729167E+02;