Schott LaK N14, 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	1.50781212E+00;
B2	3.18866829E-01;
B3	1.14287213E+00;
C1	7.46098727E-03;
C2	2.42024834E-02;
C3	8.09565165E+01;