Optical constants

Refractive index of CaSO₄ (Calcium sulfate)

Querry 1987: n,k(γ) 2.50–55.6 µm

Data: tabulated nk
Range: 2.5–55.56 µm
Points: 383
Optical axis: gamma
Licence: CC0-1.0

Biaxial crystal, axes: gamma

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.59173
Extinction coefficient k: 0.181252

Permittivity ε₁: 2.50076
Permittivity ε₂: 0.577009

Absorption coefficient α: 1930.24 cm⁻¹
Penetration depth δ = λ/(2πk): 10361.4 nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.0642398 µm⁻¹

Group index n_g: 2.34976
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 0.105071 eV

ε = (n + ik)², α = 4πk/λ, n_g = n − λ dn/dλ, GVD = λ³/(2πc²) d²n/dλ², D = −(λ/c) d²n/dλ². Group-velocity dispersion is given for formula data only.

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# CaSO4 (Calcium sulfate): Querry 1987: n,k(γ) 2.50–55.6 µm
caso4 = ls.fetch_refractiveindex("main", "CaSO4", "Querry-γ", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(caso4.range_nm)  # (2500, 55555.6) nm
eps = caso4.eps([11800])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_8c4d89eb2ee3/lightsmith"
caso4 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(caso4.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (caso4/querry-1987-3).

# ... load caso4 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=caso4)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=2500, stop_nm=55560, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

Materials guide Open a sphere of it in Studio Quick start Ask the community

Lightsmith is open source (MIT): Mie, T-matrix, BEM, DDA, FDTD, RCWA, TMM, mode solvers and inverse design behind one spec, on CPU or GPU. GitHub.

Comments and conditions

n_γ, k_γ.

Conditions

direction: gamma

References

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987)

Cite

M. R. Querry. Optical constants of minerals and other materials from the millimeter to the ultraviolet, Contractor Report CRDEC-CR-88009 (1987); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

383 rows as published

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

CaSO4 (Calcium sulfate), Querry 1987: n,k(γ) 2.50–55.6 µm: n and k versus wavelength
λ (µm)	n	k
2.5	1.521	0.0
2.5063	1.521	0.0
2.5126	1.521	0.0
2.5189	1.521	0.0
2.5253	1.521	0.001
2.5316	1.521	0.001
2.5381	1.521	0.001
2.5445	1.521	0.002
2.551	1.521	0.002
2.5575	1.521	0.002
2.5641	1.521	0.002
2.5707	1.521	0.002
2.5773	1.521	0.002
2.584	1.521	0.002
2.5907	1.521	0.002
2.5974	1.521	0.002
2.6042	1.521	0.001
2.611	1.52	0.001
2.6178	1.52	0.001
2.6247	1.52	0.001
2.6316	1.52	0.001
2.6385	1.519	0.0
2.6455	1.519	0.0
2.6525	1.518	0.0
2.6596	1.518	0.0
2.6667	1.517	0.0
2.6738	1.517	0.0
2.681	1.516	0.0
2.6882	1.515	0.0
2.6954	1.514	0.0
2.7027	1.513	0.0
2.71	1.512	0.0
2.7174	1.51	0.0
2.7248	1.509	0.0
2.7322	1.508	0.0
2.7397	1.507	0.0
2.7473	1.505	0.0
2.7548	1.504	0.0
2.7624	1.503	0.0
2.7701	1.502	0.001
2.7778	1.502	0.002
2.7855	1.501	0.003
2.7933	1.5	0.004
2.8011	1.5	0.005
2.809	1.5	0.006
2.8169	1.499	0.006
2.8249	1.499	0.007
2.8329	1.499	0.008
2.8409	1.499	0.009
2.849	1.499	0.009
2.8571	1.499	0.009
2.8653	1.499	0.009
2.8736	1.499	0.01
2.8818	1.499	0.01
2.8902	1.498	0.01
2.8986	1.498	0.01
2.907	1.498	0.011
2.9155	1.497	0.011
2.924	1.497	0.011
2.9326	1.496	0.011
2.9412	1.496	0.012
2.9499	1.496	0.012
2.9586	1.495	0.012
2.9674	1.494	0.012
2.9762	1.494	0.013
2.9851	1.493	0.013
2.994	1.492	0.014
3.003	1.492	0.014
3.012	1.491	0.016
3.0211	1.49	0.016
3.0303	1.49	0.017
3.0395	1.49	0.018
3.0488	1.49	0.019
3.0581	1.49	0.02
3.0675	1.49	0.02
3.0769	1.489	0.02
3.0864	1.489	0.021
3.096	1.488	0.022
3.1056	1.488	0.022
3.1153	1.487	0.024
3.125	1.487	0.024
3.1348	1.487	0.026
3.1447	1.487	0.027
3.1546	1.487	0.028
3.1646	1.488	0.029
3.1746	1.488	0.03
3.1847	1.489	0.031
3.1949	1.489	0.032
3.2051	1.49	0.033
3.2154	1.49	0.033
3.2258	1.491	0.034
3.2362	1.492	0.035
3.2468	1.493	0.035
3.2573	1.494	0.036
3.263	1.495	0.036
3.2787	1.496	0.036
3.2895	1.497	0.035
3.3003	1.497	0.035
3.3113	1.498	0.034
3.3223	1.498	0.034
3.3333	1.498	0.033
3.3445	1.498	0.033
3.3557	1.498	0.033
3.367	1.498	0.033
3.3784	1.498	0.033
3.3898	1.498	0.032
3.4014	1.498	0.032
3.413	1.498	0.032
3.4247	1.498	0.032
3.4364	1.498	0.032
3.4483	1.499	0.033
3.4602	1.499	0.033
3.4722	1.5	0.033
3.4843	1.5	0.033
3.4965	1.501	0.032
3.5088	1.501	0.032
3.5211	1.502	0.032
3.5336	1.502	0.031
3.5461	1.502	0.03
3.5587	1.502	0.03
3.5714	1.503	0.029
3.5842	1.503	0.028
3.5971	1.504	0.027
3.6101	1.505	0.027
3.6232	1.505	0.025
3.6364	1.505	0.023
3.6496	1.505	0.021
3.663	1.504	0.019
3.6765	1.502	0.017
3.69	1.501	0.016
3.7037	1.5	0.015
3.7175	1.498	0.014
3.7313	1.497	0.013
3.7453	1.496	0.013
3.7594	1.494	0.012
3.7736	1.493	0.011
3.7879	1.491	0.011
3.8023	1.489	0.01
3.8168	1.488	0.01
3.8314	1.486	0.01
3.8462	1.484	0.01
3.861	1.482	0.01
3.876	1.481	0.011
3.8911	1.479	0.011
3.9063	1.478	0.011
3.9216	1.477	0.012
3.937	1.476	0.012
3.9526	1.475	0.012
3.9683	1.473	0.012
3.9841	1.471	0.012
4.0	1.469	0.012
4.0161	1.468	0.013
4.0323	1.466	0.014
4.0486	1.465	0.015
4.065	1.464	0.016
4.0816	1.463	0.016
4.0984	1.461	0.017
4.1152	1.46	0.018
4.1322	1.459	0.019
4.1494	1.458	0.02
4.1667	1.457	0.021
4.1841	1.456	0.022
4.2017	1.455	0.023
4.2194	1.455	0.024
4.2373	1.454	0.025
4.2553	1.453	0.026
4.2735	1.452	0.027
4.2918	1.452	0.027
4.3103	1.451	0.028
4.329	1.45	0.029
4.3478	1.45	0.03
4.3668	1.449	0.031
4.386	1.449	0.032
4.4053	1.448	0.032
4.4248	1.446	0.033
4.4444	1.445	0.034
4.4643	1.446	0.036
4.4843	1.446	0.036
4.5045	1.445	0.036
4.5249	1.445	0.037
4.5455	1.445	0.038
4.5662	1.443	0.037
4.5872	1.442	0.037
4.6083	1.439	0.038
4.6296	1.435	0.04
4.6512	1.434	0.045
4.6729	1.436	0.052
4.6948	1.441	0.054
4.717	1.447	0.052
4.7393	1.447	0.048
4.7619	1.445	0.046
4.7847	1.444	0.045
4.8077	1.442	0.045
4.8309	1.441	0.046
4.8544	1.441	0.047
4.878	1.441	0.046
4.902	1.44	0.046
4.9261	1.439	0.046
4.9505	1.439	0.048
4.9751	1.439	0.048
5.0	1.439	0.047
5.0251	1.437	0.047
5.0505	1.437	0.047
5.0761	1.436	0.047
5.102	1.435	0.046
5.1282	1.435	0.046
5.1546	1.435	0.045
5.1813	1.433	0.043
5.2083	1.43	0.044
5.2356	1.428	0.045
5.2632	1.427	0.045
5.291	1.426	0.046
5.3191	1.426	0.045
5.3476	1.425	0.044
5.3763	1.423	0.043
5.4054	1.42	0.043
5.4348	1.418	0.043
5.4645	1.416	0.043
5.4945	1.414	0.043
5.5249	1.412	0.044
5.5556	1.41	0.045
5.5866	1.409	0.045
5.618	1.406	0.045
5.6497	1.404	0.046
5.6818	1.402	0.046
5.7143	1.4	0.046
5.7471	1.397	0.047
5.7803	1.396	0.048
5.814	1.394	0.048
5.848	1.392	0.048
5.8824	1.39	0.049
5.9172	1.388	0.049
5.9524	1.385	0.048
5.988	1.382	0.049
6.0241	1.38	0.05
6.0606	1.379	0.05
6.0976	1.374	0.049
6.135	1.371	0.052
6.1728	1.371	0.054
6.2112	1.371	0.053
6.25	1.368	0.05
6.2893	1.363	0.048
6.3291	1.359	0.048
6.3694	1.355	0.047
6.4103	1.35	0.047
6.4516	1.346	0.047
6.4935	1.342	0.048
6.5359	1.338	0.048
6.5789	1.333	0.047
6.6225	1.328	0.047
6.6667	1.323	0.046
6.7114	1.318	0.045
6.7568	1.311	0.043
6.8027	1.304	0.042
6.8493	1.296	0.043
6.8966	1.29	0.042
6.9444	1.281	0.04
6.993	1.272	0.04
7.0423	1.262	0.041
7.0922	1.254	0.04
7.1429	1.243	0.039
7.1942	1.23	0.039
7.2464	1.218	0.039
7.2993	1.206	0.039
7.3529	1.192	0.037
7.4074	1.175	0.036
7.4627	1.158	0.034
7.5188	1.137	0.032
7.5758	1.114	0.03
7.6336	1.085	0.029
7.6923	1.05	0.024
7.7519	1.02	0.042
7.8925	0.996	0.046
7.874	0.968	0.033
7.9365	0.9	0.02
8.0	0.824	0.016
8.0645	0.733	0.015
8.1301	0.605	0.031
8.1967	0.406	0.052
8.2645	0.137	0.325
8.3333	0.116	0.599
8.4034	0.122	0.855
8.4746	0.142	1.092
8.547	0.174	1.359
8.6207	0.238	1.678
8.6957	0.349	2.094
8.7719	0.607	2.735
8.8496	1.75	3.972
8.9286	3.898	1.864
9.009	3.171	0.92
9.0909	2.764	0.572
9.1743	2.491	0.438
9.2593	2.321	0.371
9.3458	2.203	0.327
9.434	2.106	0.297
9.5238	2.041	0.279
9.6154	1.982	0.261
9.7087	1.936	0.247
9.8039	1.897	0.239
9.901	1.867	0.23
10.0	1.836	0.221
10.101	1.809	0.214
10.2041	1.786	0.208
10.3093	1.767	0.203
10.4167	1.745	0.199
10.5263	1.728	0.193
10.6383	1.709	0.184
10.7527	1.696	0.186
10.8696	1.679	0.184
10.989	1.664	0.186
11.1111	1.656	0.184
11.236	1.642	0.181
11.3636	1.626	0.183
11.4943	1.618	0.18
11.6279	1.605	0.178
11.7647	1.594	0.181
11.9048	1.585	0.182
12.0482	1.577	0.179
12.1951	1.567	0.178
12.3457	1.553	0.179
12.5	1.545	0.18
12.6582	1.533	0.178
12.8205	1.521	0.182
12.987	1.512	0.176
13.1579	1.495	0.176
13.3333	1.482	0.183
13.5135	1.469	0.182
13.6986	1.455	0.184
13.8889	1.439	0.187
14.0845	1.416	0.191
14.2857	1.398	0.2
14.4928	1.406	0.21
14.7059	1.394	0.182
14.9254	1.357	0.148
15.1515	1.272	0.14
15.3846	1.186	0.123
15.625	1.053	0.117
15.873	0.522	0.271
16.129	0.347	0.956
16.3934	0.797	2.238
16.6667	3.008	0.951
16.9492	2.088	0.343
17.2414	1.873	0.307
17.5439	1.775	0.279
17.8571	1.705	0.267
18.1818	1.653	0.256
18.5185	1.617	0.254
18.8679	1.583	0.243
19.2308	1.559	0.242
19.6078	1.536	0.236
20.0	1.511	0.231
20.4082	1.489	0.228
20.8333	1.473	0.222
21.2766	1.447	0.217
21.7391	1.427	0.215
22.2222	1.406	0.212
22.7273	1.379	0.2
23.2558	1.35	0.199
23.8095	1.331	0.198
24.3902	1.294	0.191
25.0	1.263	0.186
25.641	1.226	0.177
26.3158	1.186	0.169
27.027	1.136	0.166
27.7778	1.088	0.169
28.5714	1.048	0.137
29.4118	0.976	0.13
30.303	0.897	0.12
31.25	0.798	0.109
32.2581	0.658	0.099
33.3333	0.465	0.108
34.4828	0.291	0.331
35.7143	0.209	0.5
37.037	0.168	0.678
38.4615	0.158	0.839
40.0	0.163	1.006
41.6667	0.203	1.196
43.4783	0.388	1.454
45.4545	0.823	1.349
47.619	0.917	1.058
50.0	0.925	0.761
52.6316	0.68	0.263
55.5556	0.24	0.033

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

CaSO₄ (Calcium sulfate): all datasets

About CaSO4 (Calcium sulfate)

Calcium sulfate (CaSO₄) is an inorganic compound that exists in various forms including anhydrite (anhydrous) and gypsum (dihydrate). It possesses an orthorhombic crystal structure in its anhydrous form and a monoclinic structure as gypsum. While it has limited direct applications in the field of optics, it serves as a crucial material in industrial processes. It is often used as a filler in the production of paper and textiles and acts as a coagulant in water treatment. Calcium sulfate is also employed in the construction industry as a component of drywall and plasters. Its low solubility in water makes it ideal for soil treatment, where it helps to break down heavy clay soils. In the medical field, gypsum is used for making orthopedic casts. Calcium sulfate is commonly synthesized through the neutralization of sulfuric acid with calcium carbonate or as a byproduct in various industrial processes. Its diverse applications make it an economically significant material across multiple sectors. Mineral: Anhydrite

More about CaSO4 (Calcium sulfate) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/CaSO4/nk/Querry-gamma.yml
ID: ds_8c4d89eb2ee3
API: /v1/datasets/ds_8c4d89eb2ee3

Plot