Optical Properties of Cesium Iodide*

William S. Rodney

doi:10.1364/JOSA.45.000987

Journal of the Optical Society of America
Vol. 45,
Issue 11,
pp. 987-992
(1955)
•https://doi.org/10.1364/JOSA.45.000987

Optical Properties of Cesium Iodide

William S. Rodney

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William S. Rodney, "Optical Properties of Cesium Iodide*," J. Opt. Soc. Am. 45, 987-992 (1955)

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Abstract

The refractive indices of CsI were determined at three temperatures near 15, 24, and 34°C for wavelengths from 0.29 micron in the ultraviolet to 53 microns in the infrared. The thermal coefficients of index were determined for each wavelength and all data were reduced to 24°C. A dispersion equation of the Sellmeier type having five terms was fitted to these data. Four of the terms contained absorption wavelengths which were either known experimentally or had been computed from the lattice constants of the crystal. The fifth was adjusted to fit the data and has a value of about 0.02 micron. The formula was extrapolated to infinite wavelength, and the value of n_∞² agreed with the known dielectric constant at 30 cm. The dispersion of CsI for infrared wavelengths from about 30 to 40 microns is less than that of CsBr but only by a factor of about 2. At 50 microns the dispersion of CsI is practically equal to the 40-micron dispersion of CsBr.

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Wavelength (microns)	Source	Observed index N₀	Average deviation ×10⁵	Computed index N_c	(N₀−N_c) ×10⁵
0.296728	Hg	1.98704	2.7	1.98706	−2
0.30215	Hg	1.97347	1.4	1.97352	−5
0.31256	Hg	1.95095	3.4	1.95091	+4
0.31317	Hg	1.94978	1.5	1.94971	+7
0.33414	Hg	1.91457	0.4	1.91454	+3
0.34662	Cd	1.89815	4.8	1.89813	+2
0.361051	Cd	1.88212	1.4	1.88217	−5
0.365015	Hg	1.87822	0.2	1.87826	−4
0.404656	Hg	1.84725	1.4	1.84726	−1
0.435835	Hg	1.83013	1.1	1.83015	−2
0.508582	Cd	1.80395	3.8	1.80395	0
0.546074	Hg	1.79495	0.3	1.79495	0
0.576960	Hg	1.78902	0.8	1.78899	+3
0.579066	Hg	1.78864	0.5	1.78862	+2
0.643847	Cd	1.77920	4.1	1.77920	0
0.85212	Cs	1.76290	1.5	1.76290	0
0.89440	Cs	1.76098	1.6	1.76097	+1
1.01398	Hg	1.75681	2.4	1.75680	+1
1.12866	Hg	1.75401	1.6	1.75401	0
1.3673	Hg	1.75037	2.3	1.75033	+4
1.52952	Hg	1.74877	0.8	1.74876	+1
1.7011	Hg	1.74755	0.7	1.74756	−1
2.67	H₂O	1.74442	5.8	1.74448	−6
3.4188	Poly^a	1.74353	4.8	1.74353	0
4.258	CO₂	1.74278	4.5	1.74286	−8
9.724	Poly^a	1.73937	3.0	1.73938	−1
11.035	Poly^a	1.73844	5.5	1.73832	+12
13.25	CCl₄	1.73632	6.2	1.73625	+7
14.29	Poly^a	1.73516	8.4	1.73516	0
14.98	CO₂	1.73429	3.7	1.73438	−9
17.40	TCB^b	1.73122	8.3	1.73137	−15
18.16	TCB^b	1.73030	3.1	1.73033	−3
18.47	Poly^a	1.72982	3.1	1.72990	−8
19.50	Poly^a	1.72820	1.9	1.72838	−18
20.57	TCB^b	1.72662	2.4	1.72672	−10
22.76	TCB^b	1.72305	2.0	1.72301	+4
23.82	H₂O	1.72116	2.9	1.72107	+9
25.16	H₂O	1.71865	10.0	1.71848	+17
26.63	H₂O	1.71532	6.8	1.71545	−13
28.38	H₂O	1.71194	6.5	1.71158	+36
30.70	H₂O	1.70639	6.0	1.70601	+38
33.00	H₂O	1.70018	5.9	1.69996	+22
34.48	H₂O	1.69571	16.8	1.69579	−8
35.67	H₂O	1.69224	6.7	1.69227	−3
37.56	H₂O	1.68649	21.0	1.68636	+13
39.38	H₂O	1.68046	19.1	1.68030	+16
40.43	H₂O	1.67650	5.2	1.67662	−12
44.05	H₂O	1.66297	4.2	1.66292	+5
44.97	H₂O	1.65954	30.2	1.65918	+36
47.05	H₂O	1.65069	27.8	1.65028	+41
47.98	H₂O	1.64614	22.5	1.64611	+3
49.40	H₂O	1.63941	39.1	1.63950	−9
51.48	H₂O	1.62923	16.4	1.62927	−4
53.12	H₂O	1.61925		1.62071	−146

Wavelength microns	Refractivity (n−1)×10⁵
Wavelength microns	45°C	35°C	25°C	15°C	5°C	−5°C	dn/dt×10⁵
0.6438	77 710	77 810	77 910	78 009	78 109	78 210	10.0
0.5791	78 655	78 755	78 854	78 953	79 052	79 152	9.94
0.5770	78 694	78 794	78 893	78 992	79 091	79 191	9.94
0.5461	79 289	79 388	79 488	79 585	79 685	79 785	9.94
0.5085	80 188	80 288	80 386	80 484	80 582	80 682	9.88
0.4358	82 808	82 907	83 004	83 101	83 199	83 299	9.82
0.4047	84 518	84 617	84 714	84 811	84 909	85 008	9.80

K₁	0.34617251	λ₁	0.0229567	λ₁²	0.00052701
K₂	1.0080886	λ₂	0.1466	λ₂²	0.02149156
K₃	0.28551800	λ₃	0.1810	λ₃²	0.032761
K₄	0.39743178	λ₄	0.2120	λ₄²	0.044944
K₅	3.3605359	λ₅	161.0	λ₅²	25921
		n² = 1+∑K = 6.40		∊ = 6.42

(λ = Wavelength in microns)
λ	(n−1) ×10⁵	λ	(n−1) ×10⁵	λ	(n−1) ×10⁵	λ	(n−1) ×10⁵	λ	(n−1) ×10⁵
0.280	103 939	1.80	74 702	16.4	73 267	27.6	71 334	38.8	68 227
0.300	97 872	1.84	74 683	16.6	73 242	27.8	71 289	39.0	68 159
0.320	93 700	1.88	74 664	16.8	73 216	28.0	71 244	39.2	68 091
0.340	90 649	1.92	74 647	17.0	73 190	28.2	71 199	39.4	68 023
0.360	88 324	1.96	74 631	17.2	73 164	28.4	71 153	39.6	67 954
0.380	86 497	2.00	74 616	17.4	73 137	28.6	71 107	39.8	67 884
0.400	85 027	2.20	74 551	17.6	73 111	28.8	71 061	40.0	67 814
0.420	83 823	2.40	74 500	17.8	73 083	29.0	71 014	40.2	67 744
0.440	82 820	2.60	74 460	18.0	73 056	29.2	70 967	40.4	67 673
0.460	81 975	2.80	74 427	18.2	73 028	29.4	70 919	40.6	67 601
0.480	81 255	3.00	74 400	18.4	72 999	29.6	70 871	40.8	67 530
0.500	80 635	3.50	74 346	18.6	72 971	29.8	70 823	41.0	67 457
0.520	80 097	4.00	74 305	18.8	72 942	30.0	70 774	41.2	67 384
0.540	79 626	4.50	74 270	19.0	72 913	30.2	70 725	41.4	67 311
0.560	79 213	5.00	74 239	19.2	72 883	30.4	70 676	41.6	67 237
0.580	78 846	5.50	74 210	19.4	72 853	30.6	70 626	41.8	67 163
0.600	78 520	6.00	74 181	19.6	72 823	30.8	70 576	42.0	67 088
0.620	78 229	6.50	74 152	19.8	72 793	31.0	70 525	42.2	67 013
0.640	77 967	7.00	74 122	20.0	72 762	31.2	70 474	42.4	66 937
0.660	77 731	7.50	74 091	20.2	72 731	31.4	70 422	42.6	66 861
0.680	77 517	8.00	74 059	20.4	72 699	31.6	70 371	42.8	66 784
0.700	77 323	8.50	74 026	20.6	72 667	31.8	70 318	43.0	66 707
0.720	77 146	9.00	73 991	20.8	72 635	32.0	70 266	43.2	66 629
0.740	76 985	9.50	73 954	21.0	72 602	32.2	70 213	43.4	66 551
0.760	76 836	10.0	73 916	21.2	72 570	32.4	70 159	43.6	66 472
0.780	76 700	10.2	73 901	21.4	72 536	32.6	70 105	43.8	66 392
0.800	76 575	10.4	73 885	21.6	72 503	32.8	70 051	44.0	66 312
0.820	76 459	10.6	73 868	21.8	72 469	33.0	69 996	44.2	66 232
0.840	76 352	10.8	73 852	22.0	72 435	33.2	69 941	44.4	66 151
0.860	76 252	11.0	73 835	22.2	72 400	33.4	69 886	44.6	66 070
0.880	76 159	11.2	73 818	22.4	72 365	33.6	69 830	44.8	65 988
0.900	76 074	11.4	73 800	22.6	72 330	33.8	69 774	45.0	65 905
0.920	75 993	11.6	73 783	22.8	72 294	34.0	69 717	45.2	65 822
0.940	75 918	11.8	73 765	23.0	72 258	34.2	69 660	45.4	65 739
0.960	75 848	12.0	73 746	23.2	72 222	34.4	69 602	45.6	65 655
0.980	75 782	12.2	73 728	23.4	72 185	34.6	69 544	45.8	65 570
1.00	75 721	12.4	73 709	23.6	72 148	34.8	69 486	46.0	65 485
1.04	75 608	12.6	73 690	23.8	72 111	35.0	69 427	46.2	65 399
1.08	75 508	12.8	73 670	24.0	72 073	35.2	69 368	46.4	65 313
1.12	75 419	13.0	73 650	24.2	72 035	35.4	69 308	46.6	65 226
1.16	75 339	13.2	73 630	24.4	71 997	35.6	69 248	46.8	65 138
1.20	75 268	13.4	73 610	24.6	71 958	35.8	69 188	47.0	65 051
1.24	75 203	13.6	73 589	24.8	71 919	36.0	69 127	47.2	64 962
1.28	75 144	13.8	73 568	25.0	71 880	36.2	69 065	47.4	64 873
1.32	75 091	14.0	73 547	25.2	71 840	36.4	69 004	47.6	64 783
1.36	75 042	14.2	73 525	25.4	71 800	36.6	68 941	47.8	64 693
1.40	74 997	14.4	73 504	25.6	71 759	36.8	68 879	48.0	64 602
1.44	74 956	14.6	73 481	25.8	71 718	37.0	68 815	48.2	64 511
1.48	74 919	14.8	73 459	26.0	71 677	37.2	68 752	48.4	64 419
1.52	74 884	15.0	73 436	26.2	71 635	37.4	68 688	48.6	64 326
1.56	74 852	15.2	73 413	26.4	71 593	37.6	68 623	48.8	64 233
1.60	74 822	15.4	73 389	26.6	71 551	37.8	68 558	49.0	64 139
1.64	74 795	15.6	73 366	26.8	71 508	38.0	68 493	49.2	64 045
1.68	74 769	15.8	73 342	27.0	71 465	38.2	68 427	49.4	63 950
1.72	74 745	16.0	73 317	27.2	71 422	38.4	68 361	49.6	63 855
1.76	74 723	16.2	73 292	27.4	71 378	38.6	68 294	49.8	63 759
								50.0	63 662

(λ = Wavelength in microns)
λ	Δn/Δλ	λ	Δn/Δλ	λ	Δn/Δλ
0.29	3.03326	13.3	0.001018	32.5	0.002692
0.35	1.16259	13.9	0.001064	33.1	0.002753
0.41	0.60228	14.5	0.001110	33.7	0.002815
0.47	0.36023	15.1	0.001157	34.3	0.002877
0.53	0.23514	15.7	0.001204	34.9	0.002940
0.59	0.16296	16.3	0.001251	35.5	0.003004
0.65	0.11803	16.9	0.001299	36.1	0.003069
0.71	0.08845	17.5	0.001347	36.7	0.003135
0.77	0.06811	18.1	0.001395	37.3	0.003201
0.83	0.05363	18.7	0.001444	37.9	0.003268
0.89	0.04303	19.3	0.001494	38.5	0.003336
0.95	0.03507	19.9	0.001543	39.1	0.003405
1.02	0.02813	20.5	0.001593	39.7	0.003475
1.14	0.01995	21.1	0.001644	40.3	0.003546
1.26	0.01469	21.7	0.001695	40.9	0.003618
1.38	0.01114	22.3	0.001746	41.5	0.003691
1.50	0.00867	22.9	0.001797	42.1	0.003765
1.62	0.00689	23.5	0.001849	42.7	0.003840
1.74	0.00557	24.1	0.001902	43.3	0.003916
1.86	0.00459	24.7	0.001955	43.9	0.003994
1.98	0.00383	25.3	0.002009	44.5	0.004071
2.5	0.002010	25.9	0.002062	45.1	0.004151
3.25	0.001076	26.5	0.002117	45.7	0.004232
4.75	0.000619	27.1	0.002172	46.3	0.004314
6.25	0.000583	27.7	0.002227	46.9	0.004398
7.75	0.000641	28.3	0.002283	47.5	0.004483
9.25	0.000729	28.9	0.002340	48.1	0.004569
10.3	0.000801	29.5	0.002397	48.7	0.004656
10.9	0.000842	30.1	0.002455	49.3	0.004745
11.5	0.000885	30.7	0.002513	49.9	0.004836
12.1	0.000929	31.3	0.002572
12.7	0.000974	31.9	0.002632

	(λ = Wavelength in microns)
λ	$- \frac{d n}{d T} \times 10^{5}$	$\frac{β (n^{2} - 1)}{2 n} \times 10^{5}$	$\sum_{j} F (λ λ_{j}) \frac{d λ_{j}}{d T} \times 10^{5}$
0.30	7.90	10.91	+3.01
0.35	8.75	10.22	+1.47
0.40	9.42	9.79	+0.37
0.45	9.76	9.56	−0.20
0.50	9.88	9.37	−0.51
0.60	9.93	9.18	−0.75
0.70	9.92	9.07	−0.85
0.80	9.91	9.00	−0.91
0.90	9.89	8.95	−0.94
1.0	9.86	8.91	−0.95
3.0	9.54	8.78	−0.76
5.0	9.38	8.76	−0.62
10.0	9.17	8.73	−0.44
20.0	8.93	8.61	−0.32
30.0	8.80	8.42	−0.38
35.0	8.72	8.30	−0.42
40.0	8.62	8.13	−0.49
45.0	8.48	8.41	−0.07
50.0	7.85	7.70	−0.15

Abstract

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Figures (4)

Tables (6)

Equations (8)

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