Schott LaK L12, 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	1.28115389E+00;
B2	4.82607607E-01;
B3	1.16553538E+00;
C1	6.36439821E-03;
C2	2.13764262E-02;
C3	9.32771532E+01;