Schott LaSF 18A, 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	2.19336604E+00;
B2	3.32590474E-01;
B3	1.69849859E+00;
C1	1.21930864E-02;
C2	5.32519989E-02;
C3	1.06853100E+02;