Schott LaF N21, 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	1.88298347E+00;
B2	2.40214668E-01;
B3	1.23537623E+00;
C1	9.36029744E-03;
C2	3.54026371E-02;
C3	8.43919934E+01;