Lithium Niobate (From Palik I: pp. 699-700)
ANGSTROMS
NK
  2066. 2.16    1.60
  2156. 2.36    1.67
  2254. 2.68    1.75
  2362. 3.22    1.60
  2480. 3.62    1.27
  2610. 3.52    0.43
  2755. 3.19    0.11
  2917. 2.91    0.00
  3100. 2.76    0.00
  4046.3 2.4317  0.00
  4200. 2.4089  0.00
  4358.4 2.3928  0.00
  4500. 2.3780  0.00
  4678.2 2.3634  0.00
  4799.9 2.3541  0.00
  5000. 2.3410  0.00
  5085.8 2.3356  0.00
  5460.7 2.3165  0.00
  5500. 2.3132  0.00
  5769.6 2.3040  0.00
  5789.7 2.3032  0.00
  5875.6 2.3002  0.00
  6000. 2.2967  0.00
  6438.5 2.2835  0.00
  6678.2 2.2778  0.00
  7000. 2.2716  0.00
  7065.2 2.2699  0.00
  8000. 2.2571  0.00
  8092.6 2.2541  0.00
  8716.8 2.2471  0.00
  9000. 2.2448  0.00
  9356.4 2.2412  0.00
  9599.8 2.2393  0.00
 10000. 2.2370  0.00
 10140. 2.2351  0.00
 10921.4 2.2304  0.00
 11539.2 2.2271  0.00
 11579.4 2.2269  0.00
 12000. 2.2269  0.00
 12877. 2.2211  0.00
 14000. 2.2184  0.00
 14399.7 2.2151  0.00
 16000. 2.2113  0.00
 16382.1 2.2083  0.00
 18000. 2.2049  0.00