Frits Zernike, "Refractive Indices of Ammonium Dihydrogen Phosphate and Potassium Dihydrogen Phosphate between 2000 Å and 1.5 μ," J. Opt. Soc. Am. 54, 1215-1220 (1964)
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.
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The polarizers do not give 100% polarization: therefore, it was sometimes difficult to distinguish a weak line in one direction of polarization from a coinciding strong line in the other direction of polarization. Also, sometimes some of the weaker lines were not observed. This is the reason why some wavelengths are not listed in all of the tables.
Table II(b)
Indices of KDP in air, extraordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.54615
1.54612
0.2
2536.519
Low pressure Hg
1.51586
1.51594
−0.7
2800.869
Zn
1.50416
1.50419
−0.2
2980.628
Cd
1.49824
1.49826
−0.2
3021.499
Hg
1.49708
1.49708
0.0
3035.781
Zn
1.49667
1.49668
−0.1
3125.663
Zn
1.49434
1.49432
0.2
3131.545
Hg
1.49419
1.49418
0.1
3341.478
Hg
1.48954
1.48952
0.2
3650.146
Hg
1.48432
1.48425
0.7
3654.833
Hg
1.48423
1.48418
0.5
3662.878
Hg
1.48409
1.48406
0.3
3906.410
Hg
1.48089
1.48088
0.2
4046.561
Hg
1.47927
1.47932
−0.4
4077.811
Hg
1.47898
1.47899
−0.1
4358.350
Hg
1.47640
1.47640
0.0
4916.036
Hg
1.47254
1.47254
0.0
5460.740
Hg
1.46982
1.46985
−0.3
5790.654
Hg
1.46856
1.46857
−0.1
6328.160
Laser
1.46685
1.46686
−0.1
10 139.75
Hg
1.46041
1.46043
−0.2
11 287.04
Hg
1.45917
1.45918
−0.1
11 522.76
Laser
1.45893
1.45893
−0.0
15 231.00
Laser
1.45521
1.45519
0.2
15 295.25
Hg
1.45512
1.45512
−0.1
Table III(a)
Indices of ADP in air, ordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.62598
1.62591
0.7
2288.018
Cd
1.60785
1.60794
−0.9
2536.519
Low pressure Hg
1.58688
1.58691
−0.4
2967.278
Hg
1.56462
1.56471
−0.9
3021.499
Hg
1.56270
1.56269
0.1
3125.663
Zn
1.55917
1.55915
0.2
3131.545
Hg
1.55897
1.55896
0.1
3341.478
Hg
1.55300
1.55296
0.4
3650.146
Hg
1.54615
1.54613
0.3
3654.833
Hg
1.54608
1.54604
0.4
3662.878
Hg
1.54592
1.54588
0.4
3906.410
Hg
1.54174
1.54171
0.3
4046.561
Hg
1.53969
1.53965
0.5
4077.811
Hg
1.53925
1.53922
0.3
4358.350
Hg
1.53578
1.53575
0.3
5460.740
Hg
1.52662
1.52659
0.3
5769.590
Hg
1.52478
1.52477
0.1
5790.654
Hg
1.52466
1.52465
0.0
6328.160
Laser
1.52166
1.52193
−2.8
10 139.75
Hg
1.50835
1.50825
1.0
11 287.04
Hg
1.50446
1.50446
0.0
11 522.76
Laser
1.50364
1.50366
−0.3
Table III(b)
Indices of ADP in air, extraordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.56738
1.56730
0.8
2288.018
Cd
1.55138
1.55148
−1.0
2536.519
Low pressure Hg
1.53289
1.53295
−0.6
2967.278
Hg
1.51339
1.51340
−0.1
3021.499
Hg
1.51163
1.51163
0.0
3125.663
Zn
1.50853
1.50852
0.1
3131.545
Hg
1.50832
1.50835
−0.3
3341.478
Hg
1.50313
1.50310
0.3
3650.146
Hg
1.49720
1.49715
0.5
3654.833
Hg
1.49712
1.49708
0.4
3662.878
Hg
1.49698
1.49694
0.4
4046.561
Hg
1.49159
1.49157
0.2
4077.811
Hg
1.49123
1.49120
0.3
4358.350
Hg
1.48831
1.48826
0.5
4916.036
Hg
1.48390
1.48386
0.4
5460.740
Hg
1.48079
1.48076
0.3
5769.590
Hg
1.47939
1.47934
0.5
5790.654
Hg
1.47930
1.47925
0.5
6328.160
Laser
1.47685
1.47723
−3.8
10 139.75
Hg
1.46895
1.46889
0.6
11 287.04
Hg
1.46704
1.46704
0.0
11 522.76
Laser
1.46666
1.46666
0.0
Table IV(a)
Values of the constants A, B, C, D, and E for indices with respect to air.
The polarizers do not give 100% polarization: therefore, it was sometimes difficult to distinguish a weak line in one direction of polarization from a coinciding strong line in the other direction of polarization. Also, sometimes some of the weaker lines were not observed. This is the reason why some wavelengths are not listed in all of the tables.
Table II(b)
Indices of KDP in air, extraordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.54615
1.54612
0.2
2536.519
Low pressure Hg
1.51586
1.51594
−0.7
2800.869
Zn
1.50416
1.50419
−0.2
2980.628
Cd
1.49824
1.49826
−0.2
3021.499
Hg
1.49708
1.49708
0.0
3035.781
Zn
1.49667
1.49668
−0.1
3125.663
Zn
1.49434
1.49432
0.2
3131.545
Hg
1.49419
1.49418
0.1
3341.478
Hg
1.48954
1.48952
0.2
3650.146
Hg
1.48432
1.48425
0.7
3654.833
Hg
1.48423
1.48418
0.5
3662.878
Hg
1.48409
1.48406
0.3
3906.410
Hg
1.48089
1.48088
0.2
4046.561
Hg
1.47927
1.47932
−0.4
4077.811
Hg
1.47898
1.47899
−0.1
4358.350
Hg
1.47640
1.47640
0.0
4916.036
Hg
1.47254
1.47254
0.0
5460.740
Hg
1.46982
1.46985
−0.3
5790.654
Hg
1.46856
1.46857
−0.1
6328.160
Laser
1.46685
1.46686
−0.1
10 139.75
Hg
1.46041
1.46043
−0.2
11 287.04
Hg
1.45917
1.45918
−0.1
11 522.76
Laser
1.45893
1.45893
−0.0
15 231.00
Laser
1.45521
1.45519
0.2
15 295.25
Hg
1.45512
1.45512
−0.1
Table III(a)
Indices of ADP in air, ordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.62598
1.62591
0.7
2288.018
Cd
1.60785
1.60794
−0.9
2536.519
Low pressure Hg
1.58688
1.58691
−0.4
2967.278
Hg
1.56462
1.56471
−0.9
3021.499
Hg
1.56270
1.56269
0.1
3125.663
Zn
1.55917
1.55915
0.2
3131.545
Hg
1.55897
1.55896
0.1
3341.478
Hg
1.55300
1.55296
0.4
3650.146
Hg
1.54615
1.54613
0.3
3654.833
Hg
1.54608
1.54604
0.4
3662.878
Hg
1.54592
1.54588
0.4
3906.410
Hg
1.54174
1.54171
0.3
4046.561
Hg
1.53969
1.53965
0.5
4077.811
Hg
1.53925
1.53922
0.3
4358.350
Hg
1.53578
1.53575
0.3
5460.740
Hg
1.52662
1.52659
0.3
5769.590
Hg
1.52478
1.52477
0.1
5790.654
Hg
1.52466
1.52465
0.0
6328.160
Laser
1.52166
1.52193
−2.8
10 139.75
Hg
1.50835
1.50825
1.0
11 287.04
Hg
1.50446
1.50446
0.0
11 522.76
Laser
1.50364
1.50366
−0.3
Table III(b)
Indices of ADP in air, extraordinary ray.
Wavelength (Å)
Source
Observed index
Computed index
Residual×104
2138.560
Zn
1.56738
1.56730
0.8
2288.018
Cd
1.55138
1.55148
−1.0
2536.519
Low pressure Hg
1.53289
1.53295
−0.6
2967.278
Hg
1.51339
1.51340
−0.1
3021.499
Hg
1.51163
1.51163
0.0
3125.663
Zn
1.50853
1.50852
0.1
3131.545
Hg
1.50832
1.50835
−0.3
3341.478
Hg
1.50313
1.50310
0.3
3650.146
Hg
1.49720
1.49715
0.5
3654.833
Hg
1.49712
1.49708
0.4
3662.878
Hg
1.49698
1.49694
0.4
4046.561
Hg
1.49159
1.49157
0.2
4077.811
Hg
1.49123
1.49120
0.3
4358.350
Hg
1.48831
1.48826
0.5
4916.036
Hg
1.48390
1.48386
0.4
5460.740
Hg
1.48079
1.48076
0.3
5769.590
Hg
1.47939
1.47934
0.5
5790.654
Hg
1.47930
1.47925
0.5
6328.160
Laser
1.47685
1.47723
−3.8
10 139.75
Hg
1.46895
1.46889
0.6
11 287.04
Hg
1.46704
1.46704
0.0
11 522.76
Laser
1.46666
1.46666
0.0
Table IV(a)
Values of the constants A, B, C, D, and E for indices with respect to air.