Schott Sk51, 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	1.44112715E+00;
B2	1.43968387E-01;
B3	8.81989862E-01;
C1	7.58546975E-03;
C2	2.87396017E-02;
C3	9.46838154E+01;