Optical constants

Refractive index of NaCl (Sodium chloride)

Querry 1987: n,k 0.22–167 µm

Data: tabulated nk
Range: 0.22–166.7 µm
Points: 312
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.54462
Extinction coefficient k: 0

Permittivity ε₁: 2.38585
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.05 µm⁻¹

Group index n_g: 1.574
Group velocity dispersion: — fs²/mm

Dispersion parameter D: — ps/(nm·km)
Photon energy: 2.11001 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

# NaCl (Sodium chloride): Querry 1987: n,k 0.22–167 µm
nacl = ls.fetch_refractiveindex("main", "NaCl", "Querry", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(nacl.range_nm)  # (220, 166667) nm
eps = nacl.eps([633])  # 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_0e442688fb47/lightsmith"
nacl = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(nacl.source)  # citation and provenance travel with the data

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

# ... load nacl as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=nacl)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, 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.

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

312 rows as published

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

NaCl (Sodium chloride), Querry 1987: n,k 0.22–167 µm: n and k versus wavelength
λ (µm)	n	k
0.22	1.66	0.0
0.24	1.709	0.0
0.26	1.683	0.0
0.28	1.644	0.0
0.3	1.625	0.0
0.32	1.614	0.0
0.34	1.606	0.0
0.36	1.596	0.0
0.38	1.589	0.0
0.4	1.583	0.0
0.42	1.575	0.0
0.44	1.569	0.0
0.46	1.564	0.0
0.48	1.559	0.0
0.5	1.554	0.0
0.52	1.552	0.0
0.54	1.55	0.0
0.56	1.547	0.0
0.58	1.545	0.0
0.6	1.544	0.0
0.62	1.543	0.0
0.64	1.542	0.0
0.66	1.542	0.0
0.68	1.541	0.0
0.7	1.54	0.0
0.72	1.54	0.0
0.74	1.54	0.0
0.76	1.541	0.0
0.78	1.541	0.0
0.8	1.542	0.0
0.82	1.543	0.0
0.84	1.543	0.0
0.86	1.543	0.0
0.88	1.542	0.0
0.9	1.542	0.0
0.92	1.542	0.0
0.94	1.542	0.0
0.96	1.542	0.0
0.98	1.542	0.0
1.0	1.542	0.0
1.02	1.543	0.0
1.04	1.543	0.0
1.06	1.543	0.0
1.08	1.543	0.0
1.1	1.543	0.0
1.12	1.543	0.0
1.14	1.542	0.0
1.16	1.542	0.0
1.18	1.542	0.0
1.2	1.542	0.0
1.22	1.542	0.0
1.24	1.542	0.0
1.26	1.541	0.0
1.28	1.541	0.0
1.3	1.541	0.0
1.32	1.54	0.0
1.34	1.54	0.0
1.36	1.54	0.0
1.38	1.539	0.0
1.4	1.539	0.0
1.42	1.539	0.0
1.44	1.539	0.0
1.46	1.538	0.0
1.48	1.538	0.0
1.5	1.538	0.0
1.52	1.538	0.0
1.54	1.537	0.0
1.56	1.537	0.0
1.58	1.537	0.0
1.6	1.537	0.0
1.62	1.537	0.0
1.64	1.537	0.0
1.66	1.537	0.0
1.68	1.536	0.0
1.7	1.536	0.0
1.72	1.536	0.0
1.74	1.536	0.0
1.76	1.536	0.0
1.78	1.536	0.0
1.8	1.536	0.0
1.82	1.536	0.0
1.84	1.536	0.0
1.86	1.535	0.0
1.88	1.535	0.0
1.9	1.535	0.0
1.92	1.535	0.0
1.94	1.535	0.0
1.96	1.535	0.0
1.98	1.534	0.0
2.0	1.534	0.0
2.02	1.534	0.0
2.04	1.534	0.0
2.06	1.534	0.0
2.08	1.534	0.0
2.1	1.534	0.0
2.12	1.533	0.0
2.14	1.533	0.0
2.16	1.533	0.0
2.18	1.533	0.0
2.2	1.532	0.0
2.22	1.533	0.0
2.24	1.533	0.0
2.26	1.533	0.0
2.28	1.533	0.0
2.3	1.533	0.0
2.32	1.533	0.0
2.34	1.533	0.0
2.36	1.532	0.0
2.38	1.532	0.0
2.4	1.532	0.0
2.42	1.532	0.0
2.44	1.532	0.0
2.46	1.532	0.0
2.48	1.532	0.0
2.5	1.533	0.0
2.5126	1.533	0.0
2.5253	1.533	0.0
2.5381	1.533	0.0
2.551	1.533	0.0
2.5641	1.533	0.0
2.5773	1.533	0.0
2.5907	1.533	0.0
2.6042	1.533	0.0
2.6178	1.533	0.0
2.6316	1.533	0.0
2.6455	1.533	0.0
2.6596	1.533	0.0
2.6738	1.533	0.0
2.6882	1.533	0.0
2.7027	1.533	0.0
2.7174	1.533	0.0
2.7322	1.533	0.0
2.7473	1.533	0.0
2.7624	1.533	0.0
2.7778	1.534	0.0
2.7933	1.534	0.0
2.809	1.534	0.0
2.8249	1.534	0.0
2.8409	1.534	0.0
2.8571	1.534	0.0
2.8736	1.534	0.0
2.8902	1.534	0.0
2.907	1.534	0.0
2.924	1.534	0.0
2.9412	1.534	0.0
2.9586	1.534	0.0
2.9762	1.534	0.0
2.994	1.534	0.0
3.012	1.534	0.0
3.0303	1.534	0.0
3.0488	1.534	0.0
3.0675	1.534	0.0
3.0864	1.534	0.0
3.1056	1.534	0.0
3.125	1.534	0.0
3.1447	1.534	0.0
3.1646	1.534	0.0
3.1847	1.534	0.0
3.2051	1.533	0.0
3.2258	1.533	0.0
3.2468	1.533	0.0
3.268	1.533	0.0
3.2895	1.533	0.0
3.3113	1.532	0.0
3.3333	1.532	0.0
3.3557	1.532	0.0
3.3784	1.532	0.0
3.4014	1.532	0.0
3.4247	1.532	0.0
3.4483	1.531	0.0
3.4722	1.531	0.0
3.4965	1.531	0.0
3.5211	1.531	0.0
3.5461	1.531	0.0
3.5714	1.531	0.0
3.5971	1.53	0.0
3.6232	1.53	0.0
3.6496	1.53	0.0
3.6765	1.53	0.0
3.7037	1.53	0.0
3.7313	1.53	0.0
3.7594	1.53	0.0
3.7879	1.53	0.0
3.8168	1.53	0.0
3.8462	1.529	0.0
3.876	1.529	0.0
3.9063	1.529	0.0
3.937	1.529	0.0
3.9683	1.529	0.0
4.0	1.529	0.0
4.0323	1.529	0.0
4.065	1.529	0.0
4.0984	1.529	0.0
4.1322	1.529	0.0
4.1667	1.529	0.0
4.2017	1.528	0.0
4.2373	1.528	0.0
4.2735	1.528	0.0
4.3103	1.528	0.0
4.3478	1.527	0.0
4.386	1.527	0.0
4.4248	1.527	0.0
4.4643	1.527	0.0
4.5045	1.527	0.0
4.5455	1.526	0.0
4.5872	1.526	0.0
4.6296	1.526	0.0
4.6729	1.526	0.0
4.717	1.525	0.0
4.7619	1.525	0.0
4.8077	1.525	0.0
4.8544	1.524	0.0
4.902	1.524	0.0
4.9505	1.524	0.0
5.0	1.524	0.0
5.0505	1.523	0.0
5.102	1.523	0.0
5.1546	1.523	0.0
5.2083	1.522	0.0
5.2632	1.522	0.0
5.3191	1.522	0.0
5.3763	1.521	0.0
5.4348	1.521	0.0
5.4945	1.521	0.0
5.5556	1.521	0.0
5.618	1.52	0.0
5.6818	1.52	0.0
5.7471	1.52	0.0
5.814	1.519	0.0
5.8824	1.519	0.0
5.9524	1.519	0.0
6.0241	1.519	0.0
6.0976	1.518	0.0
6.1728	1.518	0.0
6.25	1.518	0.0
6.3291	1.517	0.0
6.4103	1.517	0.0
6.4935	1.517	0.0
6.5789	1.516	0.0
6.6667	1.516	0.0
6.7568	1.516	0.0
6.8493	1.516	0.0
6.9444	1.515	0.0
7.0423	1.515	0.0
7.1429	1.514	0.0
7.2464	1.514	0.0
7.3529	1.514	0.0
7.4627	1.513	0.0
7.5758	1.513	0.0
7.6923	1.512	0.0
7.8125	1.512	0.0
7.9365	1.511	0.0
8.0645	1.511	0.0
8.1967	1.51	0.0
8.3333	1.51	0.0
8.4746	1.509	0.0
8.6207	1.509	0.0
8.7719	1.508	0.0
8.9286	1.507	0.0
9.0909	1.506	0.0
9.2593	1.505	0.0
9.434	1.504	0.0
9.6154	1.503	0.0
9.8039	1.501	0.0
10.0	1.5	0.0
10.2041	1.498	0.0
10.4167	1.497	0.0
10.6383	1.495	0.0
10.8696	1.493	0.0
11.1111	1.49	0.0
11.3636	1.488	0.0
11.6279	1.486	0.0
11.9048	1.483	0.0
12.1951	1.48	0.0
12.5	1.478	0.0
12.8205	1.474	0.0
13.1579	1.471	0.0
13.5135	1.468	0.0
13.8889	1.464	0.0
14.2857	1.46	0.0
14.7059	1.455	0.0
15.1515	1.451	0.0
15.625	1.446	0.0
16.129	1.441	0.0
16.6667	1.435	0.0
17.2414	1.428	0.0
17.8571	1.417	0.001
18.5185	1.406	0.003
19.2308	1.396	0.006
20.0	1.386	0.005
20.8333	1.371	0.004
21.7391	1.352	0.003
22.7273	1.33	0.002
23.8095	1.302	0.003
25.0	1.263	0.003
26.3158	1.226	0.014
27.7778	1.171	0.011
29.4118	1.093	0.031
31.25	1.001	0.049
33.3333	0.866	0.102
35.7143	0.677	0.172
38.4615	0.48	0.617
41.6667	0.497	0.792
45.4545	0.265	1.147
50.0	0.192	1.97
55.5556	0.431	3.582
62.5	6.293	1.948
71.4286	3.662	0.226
83.3333	3.047	0.095
100.0	2.756	0.077
125.0	2.585	0.071
166.6667	2.493	0.056

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: —

NaCl (Sodium chloride): all datasets

About NaCl (Sodium chloride)

Sodium chloride (NaCl), commonly known as table salt, is a white crystalline compound. In its purified form, it is transparent and can be shaped into clear optical windows. With its wide transparency range that extends from the ultraviolet through to the infrared spectrum, NaCl finds significant utility in the optics field. It's particularly well-suited for infrared spectroscopy. However, being hygroscopic, it readily absorbs moisture from the air, which can degrade its optical performance. Thus, careful handling and storage are essential when using it for optical applications. Mineral: Halite

More about NaCl (Sodium chloride) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/NaCl/nk/Querry.yml
ID: ds_0e442688fb47
API: /v1/datasets/ds_0e442688fb47

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