Optical constants

Refractive index of AgGaS₂ (Silver gallium sulfide, AGS)

Takaoka and Kato 1999: n(o) 0.58–10.59 µm

Data: formula 4
Range: 0.58–10.59 µm
Temperature: 293 K
Optical axis: o
Licence: CC0-1.0

Uniaxial crystal, axes: oe

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 2.57536
Extinction coefficient k: 0

Permittivity ε₁: 6.6325
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.690406 µm⁻¹

Group index n_g: 2.98105
Group velocity dispersion: 1618.29 fs²/mm

Dispersion parameter D: -8828.63 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

# AgGaS2 (Silver gallium sulfide, AGS): Takaoka and Kato 1999: n(o) 0.58–10.59 µm
aggas2 = ls.fetch_refractiveindex("main", "AgGaS2", "Takaoka-o", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(aggas2.range_nm)  # (580, 10590) nm
eps = aggas2.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_b805fa80fe42/lightsmith"
aggas2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(aggas2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (aggas2/takaoka-kato-1999-o).

# ... load aggas2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=aggas2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=580, 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.

Dispersion formula

RefractiveIndex.INFO (formula 4), λ in µm

n^{2} = 5.7975 + \frac{0.2311 λ^{0.0}}{λ^{2} - {0.0688}^{1.0}} - 0.00257 λ^{2.0}

Valid from 0.58 to 10.59 µm.

Coefficients as stored

C_i	Value
C1	5.7975
C2	0.2311
C3	0.0
C4	0.0688
C5	1.0
C6	0.0
C7	0.0
C8	0.0
C9	1.0
C10	-0.00257
C11	2.0

Comments and conditions

Ordinary ray (o); 20.0 °C

Conditions

temperature: 293 K
direction: o

References

E. Takaoka and K. Kato. Thermo-optic dispersion formula for AgGaS₂. Appl. Opt., 38, 4577-4580 (1999)

doi:10.1364/ao.38.004577 Thermo-optic dispersion formula for AgGaS_2, Applied Optics (1999)

Cite

Eiko Takaoka and Kiyoshi Kato. Thermo-optic dispersion formula for AgGaS_2. Applied Optics, 38, 4577 (1999), doi:10.1364/ao.38.004577; 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

AgGaS2 (Silver gallium sulfide, AGS), Takaoka and Kato 1999: n(o) 0.58–10.59 µm: n and k versus wavelength
λ (µm)	n
0.58	2.580744
0.584238	2.57771
0.588506	2.57474
0.592806	2.571829
0.597137	2.568978
0.6015	2.566184
0.605895	2.563446
0.610322	2.560763
0.614781	2.558134
0.619273	2.555556
0.623798	2.553029
0.628355	2.550552
0.632946	2.548123
0.637571	2.545741
0.642229	2.543405
0.646922	2.541114
0.651648	2.538867
0.656409	2.536663
0.661205	2.534501
0.666036	2.53238
0.670903	2.530299
0.675804	2.528256
0.680742	2.526252
0.685716	2.524286
0.690726	2.522355
0.695773	2.520461
0.700856	2.518601
0.705977	2.516775
0.711135	2.514983
0.716331	2.513223
0.721565	2.511495
0.726837	2.509799
0.732147	2.508133
0.737496	2.506497
0.742885	2.50489
0.748313	2.503311
0.75378	2.501761
0.759287	2.500239
0.764835	2.498743
0.770423	2.497273
0.776052	2.495829
0.781722	2.494411
0.787434	2.493017
0.793187	2.491647
0.798982	2.490302
0.80482	2.488979
0.8107	2.487679
0.816624	2.486402
0.82259	2.485146
0.8286	2.483912
0.834654	2.482699
0.840753	2.481506
0.846896	2.480334
0.853083	2.479181
0.859316	2.478048
0.865595	2.476934
0.871919	2.475838
0.87829	2.474761
0.884707	2.473702
0.891171	2.47266
0.897682	2.471636
0.904241	2.470628
0.910847	2.469638
0.917502	2.468663
0.924206	2.467705
0.930958	2.466762
0.93776	2.465834
0.944612	2.464922
0.951514	2.464025
0.958466	2.463142
0.965469	2.462273
0.972523	2.461419
0.979628	2.460578
0.986786	2.45975
0.993996	2.458936
1.00126	2.458135
1.00857	2.457347
1.01594	2.456571
1.02337	2.455808
1.03084	2.455056
1.03837	2.454317
1.04596	2.453589
1.0536	2.452873
1.0613	2.452168
1.06906	2.451474
1.07687	2.450791
1.08473	2.450118
1.09266	2.449456
1.10064	2.448804
1.10868	2.448162
1.11679	2.447531
1.12494	2.446909
1.13316	2.446296
1.14144	2.445693
1.14978	2.445099
1.15818	2.444514
1.16665	2.443939
1.17517	2.443371
1.18376	2.442813
1.19241	2.442263
1.20112	2.441721
1.20989	2.441187
1.21873	2.440662
1.22764	2.440144
1.23661	2.439634
1.24564	2.439132
1.25474	2.438637
1.26391	2.438149
1.27315	2.437669
1.28245	2.437196
1.29182	2.436729
1.30126	2.43627
1.31076	2.435817
1.32034	2.435371
1.32999	2.434931
1.3397	2.434498
1.34949	2.434071
1.35935	2.43365
1.36928	2.433235
1.37929	2.432826
1.38937	2.432423
1.39952	2.432026
1.40974	2.431635
1.42004	2.431248
1.43042	2.430868
1.44087	2.430493
1.4514	2.430122
1.462	2.429758
1.47268	2.429398
1.48344	2.429043
1.49428	2.428693
1.5052	2.428348
1.5162	2.428008
1.52728	2.427672
1.53843	2.427341
1.54967	2.427014
1.561	2.426692
1.5724	2.426374
1.58389	2.42606
1.59546	2.425751
1.60712	2.425446
1.61886	2.425144
1.63069	2.424847
1.6426	2.424553
1.65461	2.424263
1.6667	2.423977
1.67887	2.423695
1.69114	2.423416
1.7035	2.423141
1.71594	2.42287
1.72848	2.422601
1.74111	2.422336
1.75383	2.422075
1.76664	2.421816
1.77955	2.421561
1.79255	2.421309
1.80565	2.42106
1.81884	2.420814
1.83213	2.42057
1.84552	2.42033
1.859	2.420093
1.87258	2.419858
1.88627	2.419626
1.90005	2.419396
1.91393	2.41917
1.92791	2.418945
1.942	2.418724
1.95619	2.418504
1.97048	2.418287
1.98488	2.418073
1.99938	2.417861
2.01399	2.417651
2.0287	2.417443
2.04353	2.417237
2.05846	2.417033
2.0735	2.416832
2.08865	2.416632
2.10391	2.416435
2.11928	2.416239
2.13476	2.416046
2.15036	2.415854
2.16607	2.415664
2.1819	2.415475
2.19784	2.415289
2.2139	2.415104
2.23007	2.41492
2.24637	2.414738
2.26278	2.414558
2.27931	2.414379
2.29597	2.414202
2.31274	2.414026
2.32964	2.413852
2.34666	2.413679
2.36381	2.413507
2.38108	2.413336
2.39847	2.413167
2.416	2.412999
2.43365	2.412832
2.45143	2.412666
2.46934	2.412501
2.48738	2.412337
2.50556	2.412175
2.52386	2.412013
2.5423	2.411852
2.56088	2.411692
2.57959	2.411533
2.59844	2.411375
2.61742	2.411217
2.63655	2.41106
2.65581	2.410904
2.67521	2.410749
2.69476	2.410595
2.71445	2.410441
2.73428	2.410287
2.75426	2.410134
2.77438	2.409982
2.79465	2.40983
2.81507	2.409679
2.83564	2.409528
2.85636	2.409377
2.87723	2.409227
2.89825	2.409077
2.91943	2.408927
2.94076	2.408778
2.96224	2.408629
2.98389	2.40848
3.00569	2.408331
3.02765	2.408183
3.04977	2.408034
3.07205	2.407886
3.0945	2.407737
3.11711	2.407589
3.13988	2.40744
3.16282	2.407292
3.18593	2.407143
3.20921	2.406994
3.23266	2.406845
3.25627	2.406696
3.28007	2.406547
3.30403	2.406397
3.32817	2.406247
3.35249	2.406097
3.37698	2.405947
3.40166	2.405796
3.42651	2.405644
3.45155	2.405493
3.47676	2.40534
3.50217	2.405187
3.52775	2.405034
3.55353	2.40488
3.57949	2.404726
3.60565	2.40457
3.63199	2.404415
3.65853	2.404258
3.68526	2.404101
3.71218	2.403942
3.73931	2.403783
3.76663	2.403624
3.79415	2.403463
3.82187	2.403301
3.84979	2.403139
3.87792	2.402975
3.90625	2.402811
3.93479	2.402645
3.96354	2.402478
3.9925	2.40231
4.02167	2.402141
4.05106	2.401971
4.08065	2.4018
4.11047	2.401627
4.1405	2.401453
4.17075	2.401277
4.20123	2.4011
4.23192	2.400922
4.26284	2.400742
4.29399	2.400561
4.32536	2.400378
4.35696	2.400194
4.3888	2.400008
4.42086	2.39982
4.45316	2.399631
4.4857	2.39944
4.51847	2.399247
4.55149	2.399052
4.58474	2.398856
4.61824	2.398657
4.65198	2.398457
4.68597	2.398254
4.72021	2.39805
4.7547	2.397843
4.78944	2.397635
4.82443	2.397424
4.85968	2.397211
4.89519	2.396995
4.93095	2.396778
4.96698	2.396558
5.00327	2.396335
5.03982	2.396111
5.07665	2.395883
5.11374	2.395653
5.1511	2.395421
5.18874	2.395186
5.22665	2.394948
5.26484	2.394707
5.3033	2.394464
5.34205	2.394217
5.38108	2.393968
5.4204	2.393716
5.46	2.393461
5.49989	2.393202
5.54008	2.392941
5.58056	2.392676
5.62133	2.392409
5.6624	2.392138
5.70377	2.391863
5.74545	2.391585
5.78742	2.391304
5.82971	2.391019
5.8723	2.39073
5.91521	2.390438
5.95843	2.390142
6.00196	2.389842
6.04581	2.389539
6.08999	2.389231
6.13448	2.38892
6.1793	2.388604
6.22445	2.388285
6.26993	2.387961
6.31574	2.387633
6.36188	2.3873
6.40837	2.386963
6.45519	2.386622
6.50235	2.386276
6.54986	2.385926
6.59772	2.38557
6.64592	2.38521
6.69448	2.384845
6.74339	2.384475
6.79266	2.384101
6.84229	2.383721
6.89228	2.383335
6.94264	2.382945
6.99337	2.382549
7.04446	2.382148
7.09593	2.381741
7.14778	2.381329
7.2	2.380911
7.25261	2.380487
7.3056	2.380057
7.35897	2.379621
7.41274	2.379179
7.4669	2.378731
7.52146	2.378277
7.57641	2.377816
7.63177	2.377348
7.68753	2.376875
7.7437	2.376394
7.80027	2.375907
7.85727	2.375412
7.91467	2.374911
7.9725	2.374403
8.03075	2.373887
8.08943	2.373364
8.14853	2.372834
8.20807	2.372296
8.26804	2.37175
8.32845	2.371196
8.3893	2.370635
8.45059	2.370065
8.51234	2.369487
8.57453	2.368901
8.63718	2.368307
8.70028	2.367703
8.76385	2.367092
8.82788	2.366471
8.89238	2.365841
8.95735	2.365202
9.0228	2.364554
9.08872	2.363896
9.15513	2.363229
9.22202	2.362552
9.2894	2.361865
9.35727	2.361168
9.42564	2.360461
9.49451	2.359744
9.56388	2.359016
9.63375	2.358277
9.70414	2.357528
9.77504	2.356768
9.84646	2.355996
9.9184	2.355213
9.99087	2.354418
10.0639	2.353612
10.1374	2.352794
10.2115	2.351964
10.2861	2.351121
10.3612	2.350266
10.4369	2.349399
10.5132	2.348518
10.59	2.347625

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: —

AgGaS₂ (Silver gallium sulfide, AGS): all datasets

About AgGaS2 (Silver gallium sulfide, AGS)

AgGaS₂, commonly abbreviated as AGS, is a ternary chalcogenide compound that has gained considerable attention for its nonlinear optical properties. This material crystallizes in a tetragonal structure and possesses a wide transparency range, extending from the visible to the mid-infrared spectrum. AGS is particularly renowned for its high nonlinear optical coefficients, which make it an attractive material for frequency conversion processes like second-harmonic generation (SHG) and difference-frequency generation (DFG). Due to these attributes, AGS has been utilized in a range of optoelectronic applications, including optical parametric oscillators and tunable infrared lasers. Its nonlinear optical performance is highly anisotropic, meaning that the material's properties can vary depending on the crystallographic orientation, a factor that must be considered in device design and fabrication. Like many chalcogenides, AGS is sensitive to thermal and mechanical stress, requiring careful handling and environmental control. Overall, AgGaS₂ serves as a critical material in the realm of nonlinear optics, offering a unique combination of wide transparency and high nonlinear coefficients that continue to make it a subject of ongoing research and technological development.

More about AgGaS2 (Silver gallium sulfide, AGS) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/AgGaS2/nk/Takaoka-o.yml
ID: ds_b805fa80fe42
API: /v1/datasets/ds_b805fa80fe42

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