Schott SF 12, 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	1.39867348E+00;
B2	2.38403762E-01;
B3	1.03604466E+00;
C1	1.03415646E-02;
C2	4.92696913E-02;
C3	1.18327782E+02;