Schott LaSF N31, 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	1.71317198E+00;
B2	7.18575109E-01;
B3	1.72332470E+00;
C1	8.19172228E-03;
C2	2.97801704E-02;
C3	1.38461313E+02;