Schott LaK 23, 334nm - 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:	1.12743279E+00;
B2:	6.08744560E-01;
B3:	9.98634884E-01;
C1:	5.25834509E-03;
C2:	1.89138834E-02;
C3:	8.75468054E+01;