Schott LaF N23, 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	1.65263149E+00;
B2	1.39745768E-01;
B3	9.38734334E-01;
C1	9.31143124E-03;
C2	3.91167497E-02;
C3	9.82388615E+01;