Optical constants

Refractive index of IRG 23 (SCHOTT)

IRG 23: n 1–12 µm

Data: formula 1
Range: 1–12 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 2.80687
Extinction coefficient k: 0

Permittivity ε₁: 7.8785
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.00755893 µm⁻¹

Group index n_g: 2.83302
Group velocity dispersion: 430.239 fs²/mm

Dispersion parameter D: -67.6952 ps/(nm·km)
Photon energy: 0.358336 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

# IRG 23 (SCHOTT): IRG 23
schott_irg23 = ls.fetch_refractiveindex("specs", "SCHOTT-infrared", "IRG23", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_irg23.range_nm)  # (1000, 12000) nm
eps = schott_irg23.eps([3460])  # 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_b5abefb62346/lightsmith"
schott_irg23 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(schott_irg23.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (schott-irg23/schott).

# ... load schott_irg23 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=schott_irg23)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=1000, stop_nm=12000, 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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_b5abefb62346/lightsmith?model=drude_lorentz"
schott_irg23_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

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.

Dispersion formula

Sellmeier (formula 1), λ in µm

n^{2} - 1 = 3.74971 + \frac{3.07065 λ^{2}}{λ^{2} - {0.498392}^{2}} + \frac{0.953206 λ^{2}}{λ^{2} - {40.7557}^{2}}

Valid from 1.0 to 12.0 µm.

Coefficients as stored

C_i	Value
C1	3.74971
C2	3.07065
C3	0.498392
C4	0.953206
C5	40.7557

Comments and conditions

20 °C

References

SCHOTT Infrared Chalcogenide Glasses - IRG 23 Product flyer (Version May 2013)

Cite

SCHOTT Infrared Chalcogenide Glasses - IRG 23 Product flyer (Version May 2013); Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

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

IRG 23 (SCHOTT), IRG 23: n and k versus wavelength
λ (µm)	n
1	2.972304
1.00625	2.969501
1.01253	2.966753
1.01886	2.964058
1.02522	2.961415
1.03163	2.958822
1.03807	2.956278
1.04456	2.953782
1.05108	2.951333
1.05765	2.94893
1.06426	2.946572
1.07091	2.944257
1.0776	2.941984
1.08433	2.939753
1.0911	2.937563
1.09792	2.935412
1.10478	2.9333
1.11168	2.931226
1.11863	2.929189
1.12561	2.927188
1.13265	2.925222
1.13972	2.923291
1.14684	2.921394
1.15401	2.91953
1.16122	2.917698
1.16847	2.915898
1.17577	2.914129
1.18312	2.91239
1.19051	2.91068
1.19794	2.909
1.20543	2.907349
1.21296	2.905725
1.22054	2.904128
1.22816	2.902558
1.23583	2.901014
1.24356	2.899496
1.25132	2.898003
1.25914	2.896535
1.26701	2.89509
1.27492	2.893669
1.28289	2.892272
1.2909	2.890897
1.29897	2.889544
1.30708	2.888213
1.31525	2.886903
1.32346	2.885615
1.33173	2.884347
1.34005	2.883099
1.34842	2.881871
1.35685	2.880662
1.36532	2.879472
1.37385	2.878301
1.38244	2.877149
1.39107	2.876014
1.39976	2.874897
1.40851	2.873797
1.41731	2.872714
1.42616	2.871648
1.43507	2.870598
1.44404	2.869565
1.45306	2.868547
1.46214	2.867545
1.47127	2.866558
1.48046	2.865585
1.48971	2.864628
1.49902	2.863685
1.50838	2.862756
1.5178	2.861841
1.52729	2.86094
1.53683	2.860052
1.54643	2.859177
1.55609	2.858316
1.56581	2.857467
1.57559	2.856631
1.58544	2.855807
1.59534	2.854995
1.60531	2.854194
1.61534	2.853406
1.62543	2.852629
1.63558	2.851864
1.6458	2.851109
1.65608	2.850366
1.66643	2.849633
1.67684	2.848911
1.68731	2.848199
1.69786	2.847497
1.70846	2.846806
1.71914	2.846124
1.72988	2.845452
1.74068	2.844789
1.75156	2.844136
1.7625	2.843492
1.77351	2.842858
1.78459	2.842232
1.79574	2.841615
1.80696	2.841007
1.81825	2.840407
1.82961	2.839816
1.84104	2.839232
1.85254	2.838657
1.86411	2.83809
1.87576	2.837531
1.88747	2.83698
1.89927	2.836436
1.91113	2.8359
1.92307	2.835371
1.93508	2.834849
1.94717	2.834335
1.95934	2.833827
1.97158	2.833327
1.98389	2.832833
1.99629	2.832346
2.00876	2.831865
2.02131	2.831392
2.03394	2.830924
2.04664	2.830463
2.05943	2.830008
2.0723	2.829559
2.08524	2.829116
2.09827	2.828679
2.11138	2.828248
2.12457	2.827823
2.13784	2.827403
2.1512	2.826989
2.16463	2.82658
2.17816	2.826177
2.19177	2.825779
2.20546	2.825387
2.21924	2.824999
2.2331	2.824617
2.24705	2.824239
2.26109	2.823867
2.27521	2.823499
2.28943	2.823137
2.30373	2.822779
2.31812	2.822425
2.33261	2.822076
2.34718	2.821732
2.36184	2.821392
2.3766	2.821056
2.39144	2.820725
2.40638	2.820398
2.42142	2.820075
2.43654	2.819757
2.45177	2.819442
2.46708	2.819131
2.48249	2.818825
2.498	2.818522
2.51361	2.818223
2.52931	2.817928
2.54511	2.817636
2.56101	2.817348
2.57701	2.817064
2.59311	2.816783
2.60931	2.816506
2.62561	2.816232
2.64202	2.815962
2.65852	2.815694
2.67513	2.815431
2.69184	2.81517
2.70866	2.814913
2.72558	2.814658
2.74261	2.814407
2.75974	2.814159
2.77698	2.813914
2.79433	2.813672
2.81179	2.813433
2.82935	2.813196
2.84703	2.812963
2.86482	2.812732
2.88271	2.812504
2.90072	2.812279
2.91884	2.812056
2.93708	2.811836
2.95543	2.811619
2.97389	2.811404
2.99247	2.811192
3.01116	2.810982
3.02998	2.810774
3.04891	2.810569
3.06795	2.810366
3.08712	2.810166
3.10641	2.809968
3.12581	2.809772
3.14534	2.809578
3.16499	2.809387
3.18476	2.809198
3.20466	2.80901
3.22468	2.808825
3.24482	2.808642
3.2651	2.808461
3.28549	2.808282
3.30602	2.808105
3.32667	2.80793
3.34745	2.807757
3.36837	2.807585
3.38941	2.807416
3.41058	2.807248
3.43189	2.807082
3.45333	2.806917
3.47491	2.806755
3.49661	2.806594
3.51846	2.806435
3.54044	2.806277
3.56256	2.806121
3.58481	2.805967
3.60721	2.805814
3.62974	2.805663
3.65242	2.805513
3.67524	2.805365
3.6982	2.805218
3.7213	2.805072
3.74455	2.804928
3.76794	2.804786
3.79148	2.804644
3.81517	2.804504
3.839	2.804366
3.86299	2.804228
3.88712	2.804092
3.9114	2.803957
3.93584	2.803824
3.96043	2.803691
3.98517	2.80356
4.01007	2.80343
4.03512	2.803301
4.06033	2.803173
4.08569	2.803046
4.11122	2.80292
4.1369	2.802795
4.16274	2.802671
4.18875	2.802549
4.21492	2.802427
4.24125	2.802306
4.26775	2.802186
4.29441	2.802067
4.32124	2.801949
4.34823	2.801832
4.3754	2.801716
4.40273	2.8016
4.43024	2.801486
4.45791	2.801372
4.48576	2.801259
4.51379	2.801146
4.54199	2.801035
4.57036	2.800924
4.59891	2.800814
4.62764	2.800704
4.65655	2.800596
4.68564	2.800487
4.71492	2.80038
4.74437	2.800273
4.77401	2.800167
4.80384	2.800061
4.83385	2.799956
4.86405	2.799851
4.89443	2.799747
4.92501	2.799644
4.95578	2.799541
4.98674	2.799438
5.01789	2.799336
5.04924	2.799234
5.08078	2.799133
5.11252	2.799032
5.14446	2.798932
5.1766	2.798832
5.20894	2.798732
5.24148	2.798633
5.27423	2.798534
5.30718	2.798435
5.34033	2.798337
5.3737	2.798238
5.40727	2.798141
5.44105	2.798043
5.47504	2.797945
5.50924	2.797848
5.54366	2.797751
5.57829	2.797654
5.61314	2.797558
5.64821	2.797461
5.68349	2.797365
5.719	2.797269
5.75473	2.797173
5.79068	2.797076
5.82686	2.79698
5.86326	2.796885
5.89989	2.796789
5.93675	2.796693
5.97383	2.796597
6.01115	2.796501
6.04871	2.796405
6.0865	2.796309
6.12452	2.796213
6.16278	2.796117
6.20128	2.796021
6.24002	2.795924
6.27901	2.795828
6.31823	2.795731
6.3577	2.795635
6.39742	2.795538
6.43739	2.79544
6.47761	2.795343
6.51807	2.795246
6.55879	2.795148
6.59977	2.79505
6.641	2.794951
6.68249	2.794853
6.72423	2.794754
6.76624	2.794654
6.80851	2.794555
6.85105	2.794455
6.89385	2.794354
6.93691	2.794254
6.98025	2.794153
7.02386	2.794051
7.06774	2.793949
7.11189	2.793846
7.15632	2.793743
7.20103	2.79364
7.24602	2.793536
7.29128	2.793431
7.33684	2.793326
7.38267	2.79322
7.42879	2.793114
7.4752	2.793007
7.5219	2.792899
7.56889	2.792791
7.61618	2.792682
7.66376	2.792572
7.71164	2.792462
7.75981	2.792351
7.80829	2.792239
7.85707	2.792127
7.90616	2.792013
7.95555	2.791899
8.00525	2.791784
8.05526	2.791668
8.10558	2.791551
8.15622	2.791433
8.20717	2.791315
8.25845	2.791195
8.31004	2.791074
8.36195	2.790953
8.41419	2.79083
8.46676	2.790707
8.51965	2.790582
8.57288	2.790456
8.62644	2.790329
8.68033	2.790201
8.73456	2.790072
8.78912	2.789941
8.84403	2.78981
8.89928	2.789677
8.95488	2.789543
9.01082	2.789407
9.06711	2.789271
9.12376	2.789132
9.18076	2.788993
9.23811	2.788852
9.29582	2.78871
9.3539	2.788566
9.41233	2.788421
9.47114	2.788274
9.5303	2.788125
9.58984	2.787975
9.64975	2.787824
9.71004	2.787671
9.7707	2.787516
9.83174	2.787359
9.89316	2.787201
9.95497	2.787041
10.0172	2.786879
10.0797	2.786715
10.1427	2.78655
10.2061	2.786382
10.2698	2.786212
10.334	2.786041
10.3986	2.785867
10.4635	2.785692
10.5289	2.785514
10.5947	2.785334
10.6608	2.785152
10.7274	2.784968
10.7945	2.784782
10.8619	2.784593
10.9298	2.784402
10.998	2.784208
11.0667	2.784012
11.1359	2.783814
11.2055	2.783612
11.2755	2.783409
11.3459	2.783203
11.4168	2.782994
11.4881	2.782782
11.5599	2.782568
11.6321	2.782351
11.7048	2.78213
11.7779	2.781907
11.8515	2.781681
11.9255	2.781452
12	2.78122

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: —

IRG 23 (SCHOTT): all datasets

IRG 23 n 1–12 µm default

About IRG 23 (SCHOTT)

SCHOTT AG is a German multinational company renowned for its expertise in specialty glass and glass-ceramics. Founded in 1884, the company has been a pioneer in the field, with innovations that have significantly impacted a variety of industries, including healthcare, home appliances, electronics, and optics. In the optical domain, SCHOTT offers a comprehensive range of high-quality glass types, including crown and flint glasses, as well as specialty materials like laser glasses and radiation-shielding glasses. These materials are used in a myriad of applications, from consumer electronics and camera lenses to scientific instruments and aerospace technologies. SCHOTT's glass products are highly regarded for their quality, consistency, and durability, meeting rigorous industry standards. With a strong focus on research and development, the company has continued to introduce innovative products that address the evolving needs of the optical industry. SCHOTT's commitment to quality and innovation has established it as a leading provider of specialty glass solutions, making it a go-to choice for designers and manufacturers seeking high-performance materials. SCHOTT also publishes a glass catalog (SCHOTT Optical Glass Datasheets), which is a standard reference for the properties of many optical glasses.

More about IRG 23 (SCHOTT) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/specs/schott/infrared/IRG23.yml
ID: ds_b5abefb62346
API: /v1/datasets/ds_b5abefb62346

Plot