Schott LaK 28, 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	1.50441986E+00;
B2	4.74120561E-01;
B3	1.17784354E+00;
C1	7.19665592E-03;
C2	2.49143227E-02;
C3	8.31443210E+01;