Lithium Niobate (From Palik I: pp. 699-700)
ANGSTROMS
NK
  2066. 2.30    1.22
  2156. 2.46    1.22
  2254. 2.76    1.16
  2362. 2.98    1.00
  2480. 3.10    0.64
  2610. 2.99    0.25
  2755. 2.79    0.06
  2917. 2.59    0.00
  3100. 2.49    0.00
  4046.3 2.3260  0.00
  4200. 2.3025  0.00
  4358.4 2.2932  0.00
  4500. 2.2772  0.00
  4678.2 2.2683  0.00
  4799.9 2.2605  0.00
  5000. 2.2457  0.00
  5085.8 2.2448  0.00
  5460.7 2.2285  0.00
  5500. 2.2237  0.00
  5769.6 2.2178  0.00
  5789.7 2.2171  0.00
  5875.6 2.2147  0.00
  6000. 2.2082  0.00
  6438.5 2.2002  0.00
  6678.2 2.1953  0.00
  7000. 2.1874  0.00
  7065.2 2.1886  0.00
  8000. 2.1745  0.00
  8092.6 2.1749  0.00
  8716.8 2.1688  0.00
  9000. 2.1641  0.00
  9356.4 2.1639  0.00
  9599.8 2.1622  0.00
 10000. 2.1567  0.00
 10140. 2.1584  0.00
 10921.4 2.1545  0.00
 11539.2 2.1517  0.00
 11579.4 2.1515  0.00
 12000. 2.1478  0.00
 12877. 2.1464  0.00
 14000. 2.1417  0.00
 14399.7 2.1413  0.00
 16000. 2.1361  0.00
 16382.1 2.1356  0.00
 18000. 2.1306  0.00