Schott BK7, 313nm - 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 1.039612e+000
C1 6.000699e-003
B2 2.317923e-001
C2 2.001791e-002
B3 1.010469e+000
C3 1.035607e+002