Schott Sk15, 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	1.29172765E+00;
B2	2.98392713E-01;
B3	9.55518497E-01;
C1	6.86358120E-03;
C2	2.28704312E-02;
C3	9.74779177E+01;