The refractive indices of ADP and KDP have been measured at 25 wavelengths between 2138 Å and 1.529 µ, and at 24.8°C. The measured values have been corrected to give absolute indices. Curves have been fitted to the measured and to the corrected data.
The measured and the computed data are given both in air and in vacuum. The accuracy of the data is believed to be ±0.00003 or better.
FRITS ZERNIKE, JR., "Refractive Indices of Ammonium Dihydrogen Phosphate and Potassium Dihydrogen Phosphate between 2000 Å and 1.5 µ," J. Opt. Soc. Am. 54, 1215-1219 (1964)