Schott LaK N22, 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	1.14229781E+00;
B2	5.35138441E-01;
B3	1.04088385E+00;
C1	5.85778594E-03;
C2	1.98546147E-02;
C3	1.00834017E+02;