Schott SF 53, 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	1.56973534E+00;
B2	3.06366017E-01;
B3	1.03021429E+00;
C1	1.20851905E-02;
C2	5.41694051E-02;
C3	1.17353733E+02;