Schott LaK L21, 313nm - 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	1.29854376E+00;
B2	3.50521897E-01;
B3	1.17089829E+00;
C1	6.28043610E-03;
C2	2.10842688E-02;
C3	8.54204779E+01;