Schott SF 15, 405nm - 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	1.53925927E+00;
B2	2.47620926E-01;
B3	1.03816409E+00;
C1	1.19307961E-02;
C2	5.56077536E-02;
C3	1.16416747E+02;