Optical constants

Refractive index of AgGaSe₂ (Silver gallium selenide, AGSe)

Kato et al. 2021: n(e) 0.81–18 µm

Data: formula 4
Range: 0.81–18 µm
Temperature: 294 K
Optical axis: e
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: 2.58698
Extinction coefficient k: 0

Permittivity ε₁: 6.69244
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.00508993 µm⁻¹

Group index n_g: 2.60642
Group velocity dispersion: 210.977 fs²/mm

Dispersion parameter D: -27.2338 ps/(nm·km)
Photon energy: 0.324566 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

# AgGaSe2 (Silver gallium selenide, AGSe): Kato et al. 2021: n(e) 0.81–18 µm
aggase2 = ls.fetch_refractiveindex("main", "AgGaSe2", "Kato-e", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(aggase2.range_nm)  # (810, 18000) nm
eps = aggase2.eps([3820])  # 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_a444b554cc71/lightsmith"
aggase2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(aggase2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (aggase2/kato-2021-e).

# ... load aggase2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=aggase2)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=810, 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} = 11.33168 + \frac{0.45951 λ^{0.0}}{λ^{2} - {0.21284}^{1.0}} + \frac{17816.81 λ^{0.0}}{λ^{2} - {3828.78}^{1.0}}

Valid from 0.81 to 18.0 µm.

Coefficients as stored

C_i	Value
C1	11.33168
C2	0.45951
C3	0.0
C4	0.21284
C5	1.0
C6	17816.81
C7	0.0
C8	3828.78
C9	1.0

Comments and conditions

Extraordinary ray (e). 20–22 °C.

Conditions

temperature: 294 K
direction: e

References

K. Kato, K. Miyata, V. Petrov. Refined Sellmeier equations for AgGaSe₂ up to 18 µm. Appl. Opt., 60, 805–808 (2021)

doi:10.1364/ao.401828 Refined Sellmeier equations for AgGaSe<sub>2</sub> up to 18 µm, Applied Optics (2021)

Cite

Kiyoshi Kato, Kentaro Miyata and Valentin Petrov. Refined Sellmeier equations for AgGaSe<sub>2</sub> up to 18 µm. Applied Optics, 60, 805 (2021), doi:10.1364/ao.401828; 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

AgGaSe2 (Silver gallium selenide, AGSe), Kato et al. 2021: n(e) 0.81–18 µm: n and k versus wavelength
λ (µm)	n
0.81	2.777436
0.81632	2.773201
0.822689	2.769086
0.829108	2.765086
0.835577	2.761196
0.842097	2.757412
0.848667	2.753732
0.855289	2.75015
0.861962	2.746663
0.868688	2.743269
0.875466	2.739963
0.882296	2.736743
0.88918	2.733606
0.896118	2.730549
0.90311	2.727569
0.910157	2.724664
0.917258	2.721831
0.924415	2.719068
0.931628	2.716373
0.938897	2.713743
0.946222	2.711177
0.953605	2.708672
0.961046	2.706227
0.968544	2.703839
0.976101	2.701508
0.983717	2.699231
0.991392	2.697007
0.999128	2.694834
1.00692	2.69271
1.01478	2.690635
1.0227	2.688606
1.03068	2.686623
1.03872	2.684684
1.04682	2.682788
1.05499	2.680934
1.06322	2.679121
1.07152	2.677346
1.07988	2.675611
1.0883	2.673912
1.0968	2.67225
1.10535	2.670623
1.11398	2.669031
1.12267	2.667473
1.13143	2.665946
1.14026	2.664452
1.14915	2.662989
1.15812	2.661556
1.16716	2.660152
1.17626	2.658777
1.18544	2.65743
1.19469	2.656111
1.20401	2.654818
1.21341	2.65355
1.22287	2.652309
1.23242	2.651091
1.24203	2.649898
1.25172	2.648729
1.26149	2.647582
1.27133	2.646458
1.28125	2.645356
1.29125	2.644275
1.30132	2.643215
1.31148	2.642175
1.32171	2.641155
1.33202	2.640155
1.34241	2.639174
1.35289	2.638211
1.36344	2.637266
1.37408	2.636339
1.3848	2.63543
1.39561	2.634537
1.4065	2.633661
1.41747	2.632801
1.42853	2.631957
1.43968	2.631129
1.45091	2.630316
1.46223	2.629517
1.47364	2.628733
1.48514	2.627964
1.49673	2.627208
1.5084	2.626466
1.52017	2.625737
1.53203	2.625021
1.54399	2.624318
1.55603	2.623627
1.56818	2.622948
1.58041	2.622282
1.59274	2.621627
1.60517	2.620984
1.61769	2.620352
1.63032	2.619731
1.64304	2.61912
1.65586	2.61852
1.66878	2.617931
1.6818	2.617352
1.69492	2.616782
1.70814	2.616222
1.72147	2.615672
1.7349	2.615131
1.74844	2.6146
1.76208	2.614077
1.77583	2.613563
1.78968	2.613057
1.80365	2.61256
1.81772	2.612071
1.8319	2.611591
1.8462	2.611118
1.8606	2.610653
1.87512	2.610196
1.88975	2.609746
1.90449	2.609303
1.91935	2.608868
1.93433	2.608439
1.94942	2.608018
1.96463	2.607603
1.97996	2.607195
1.99541	2.606793
2.01098	2.606397
2.02667	2.606008
2.04248	2.605625
2.05842	2.605248
2.07448	2.604877
2.09067	2.604512
2.10698	2.604152
2.12342	2.603798
2.13999	2.603449
2.15668	2.603106
2.17351	2.602767
2.19047	2.602434
2.20756	2.602106
2.22478	2.601783
2.24214	2.601464
2.25964	2.601151
2.27727	2.600842
2.29504	2.600537
2.31294	2.600237
2.33099	2.599941
2.34918	2.59965
2.36751	2.599362
2.38598	2.599079
2.4046	2.5988
2.42336	2.598524
2.44227	2.598253
2.46132	2.597985
2.48053	2.597721
2.49988	2.597461
2.51938	2.597204
2.53904	2.596951
2.55885	2.596701
2.57882	2.596454
2.59894	2.596211
2.61922	2.59597
2.63965	2.595733
2.66025	2.595499
2.68101	2.595268
2.70192	2.59504
2.72301	2.594815
2.74425	2.594592
2.76566	2.594373
2.78724	2.594156
2.80899	2.593941
2.83091	2.593729
2.85299	2.59352
2.87526	2.593313
2.89769	2.593108
2.9203	2.592906
2.94308	2.592706
2.96605	2.592508
2.98919	2.592313
3.01251	2.592119
3.03602	2.591928
3.05971	2.591739
3.08358	2.591551
3.10764	2.591366
3.13189	2.591182
3.15632	2.591
3.18095	2.59082
3.20577	2.590642
3.23078	2.590465
3.25599	2.59029
3.28139	2.590116
3.307	2.589944
3.3328	2.589774
3.3588	2.589605
3.38501	2.589437
3.41142	2.58927
3.43804	2.589105
3.46486	2.588942
3.4919	2.588779
3.51914	2.588618
3.5466	2.588457
3.57427	2.588298
3.60216	2.58814
3.63027	2.587983
3.65859	2.587827
3.68714	2.587672
3.71591	2.587517
3.7449	2.587364
3.77412	2.587211
3.80357	2.587059
3.83324	2.586908
3.86315	2.586758
3.89329	2.586608
3.92367	2.586459
3.95429	2.58631
3.98514	2.586162
4.01623	2.586014
4.04757	2.585867
4.07915	2.585721
4.11098	2.585574
4.14305	2.585428
4.17538	2.585283
4.20796	2.585137
4.24079	2.584992
4.27388	2.584847
4.30723	2.584703
4.34083	2.584558
4.3747	2.584413
4.40883	2.584269
4.44323	2.584125
4.4779	2.58398
4.51284	2.583836
4.54805	2.583691
4.58354	2.583546
4.6193	2.583401
4.65534	2.583256
4.69167	2.583111
4.72827	2.582965
4.76516	2.582819
4.80234	2.582673
4.83981	2.582526
4.87758	2.582379
4.91563	2.582232
4.95399	2.582084
4.99264	2.581935
5.0316	2.581786
5.07085	2.581636
5.11042	2.581486
5.15029	2.581335
5.19048	2.581183
5.23098	2.58103
5.27179	2.580877
5.31292	2.580723
5.35438	2.580568
5.39615	2.580412
5.43826	2.580255
5.48069	2.580097
5.52345	2.579938
5.56655	2.579778
5.60998	2.579617
5.65375	2.579454
5.69787	2.579291
5.74232	2.579126
5.78713	2.57896
5.83228	2.578793
5.87779	2.578624
5.92365	2.578454
5.96987	2.578282
6.01645	2.578109
6.06339	2.577934
6.1107	2.577758
6.15838	2.57758
6.20643	2.5774
6.25485	2.577219
6.30366	2.577036
6.35284	2.576851
6.40241	2.576664
6.45236	2.576476
6.50271	2.576285
6.55344	2.576092
6.60458	2.575898
6.65611	2.575701
6.70804	2.575502
6.76038	2.575301
6.81313	2.575097
6.86629	2.574891
6.91986	2.574683
6.97385	2.574473
7.02827	2.57426
7.0831	2.574044
7.13837	2.573826
7.19407	2.573605
7.2502	2.573381
7.30677	2.573155
7.36378	2.572926
7.42123	2.572693
7.47914	2.572458
7.53749	2.57222
7.5963	2.571979
7.65557	2.571735
7.71531	2.571487
7.7755	2.571237
7.83617	2.570983
7.89731	2.570725
7.95893	2.570464
8.02103	2.570199
8.08361	2.569931
8.14669	2.569659
8.21025	2.569384
8.27431	2.569104
8.33887	2.568821
8.40393	2.568534
8.4695	2.568242
8.53559	2.567947
8.60219	2.567647
8.6693	2.567343
8.73695	2.567034
8.80512	2.566721
8.87382	2.566403
8.94305	2.566081
9.01283	2.565754
9.08315	2.565422
9.15402	2.565086
9.22545	2.564744
9.29743	2.564397
9.36997	2.564045
9.44308	2.563687
9.51676	2.563325
9.59101	2.562956
9.66585	2.562582
9.74126	2.562203
9.81727	2.561817
9.89387	2.561426
9.97107	2.561028
10.0489	2.560624
10.1273	2.560214
10.2063	2.559798
10.2859	2.559375
10.3662	2.558945
10.4471	2.558509
10.5286	2.558066
10.6107	2.557616
10.6935	2.557158
10.7769	2.556693
10.861	2.556221
10.9458	2.555741
11.0312	2.555254
11.1172	2.554759
11.204	2.554255
11.2914	2.553744
11.3795	2.553224
11.4683	2.552696
11.5578	2.552159
11.648	2.551613
11.7388	2.551058
11.8304	2.550494
11.9227	2.549921
12.0158	2.549338
12.1095	2.548746
12.204	2.548144
12.2992	2.547532
12.3952	2.546909
12.4919	2.546276
12.5894	2.545633
12.6876	2.544979
12.7866	2.544313
12.8864	2.543637
12.9869	2.542949
13.0882	2.542249
13.1903	2.541537
13.2933	2.540813
13.397	2.540077
13.5015	2.539328
13.6069	2.538566
13.713	2.537791
13.82	2.537003
13.9278	2.536201
14.0365	2.535385
14.146	2.534555
14.2564	2.53371
14.3676	2.53285
14.4798	2.531976
14.5927	2.531086
14.7066	2.53018
14.8213	2.529259
14.937	2.528321
15.0535	2.527366
15.171	2.526394
15.2893	2.525405
15.4086	2.524399
15.5289	2.523374
15.65	2.52233
15.7721	2.521268
15.8952	2.520187
16.0192	2.519086
16.1442	2.517965
16.2702	2.516823
16.3971	2.515661
16.5251	2.514477
16.654	2.513271
16.7839	2.512043
16.9149	2.510792
17.0469	2.509518
17.1799	2.508221
17.3139	2.506899
17.449	2.505552
17.5852	2.504179
17.7224	2.502781
17.8606	2.501357
18	2.499905

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: —

AgGaSe₂ (Silver gallium selenide, AGSe): all datasets

About AgGaSe2 (Silver gallium selenide, AGSe)

AgGaSe₂, often abbreviated as AGSe, is a ternary I-III-VI₂ chalcogenide compound known for its exceptional nonlinear optical properties. It crystallizes in a monoclinic structure and has a broad transparency range that extends from the visible to the mid-infrared regions of the electromagnetic spectrum. One of the standout features of AgGaSe₂ is its high nonlinear optical coefficient, which makes it especially useful in applications requiring frequency conversion, such as second-harmonic generation (SHG), sum-frequency generation (SFG), and parametric down-conversion. The compound is commonly employed in optical parametric oscillators (OPOs) and other tunable laser systems designed for mid-infrared applications. Its properties are highly anisotropic, which necessitates precise crystal orientation during device fabrication. While AGSe offers many advantages in terms of its optical characteristics, it is also sensitive to thermal and mechanical stresses, making careful handling and environmental control crucial for maintaining its performance. Overall, AgGaSe₂ is a pivotal material in the field of nonlinear optics, and it continues to be the focus of extensive research aimed at better understanding its properties and potential applications.

More about AgGaSe2 (Silver gallium selenide, AGSe) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/AgGaSe2/nk/Kato-e.yml
ID: ds_a444b554cc71
API: /v1/datasets/ds_a444b554cc71

Plot