Optical constants

Refractive index of AgGaSe₂ (Silver gallium selenide, AGSe)

Kato et al. 2021: n(o) 0.81–18 µm

Data: formula 4
Range: 0.81–18 µm
Temperature: 294 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: 2.61956
Extinction coefficient k: 0

Permittivity ε₁: 6.86209
Permittivity ε₂: 0

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

Abbe number V_d: —
Chromatic dispersion dn/dλ: -0.0047978 µm⁻¹

Group index n_g: 2.63789
Group velocity dispersion: 190.442 fs²/mm

Dispersion parameter D: -24.5831 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(o) 0.81–18 µm
aggase2 = ls.fetch_refractiveindex("main", "AgGaSe2", "Kato-o", 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_5b698a2ce4da/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-o).

# ... 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} = 11.62264 + \frac{0.43221 λ^{0.0}}{λ^{2} - {0.15597}^{1.0}} + \frac{18868.52 λ^{0.0}}{λ^{2} - {3953.34}^{1.0}}

Valid from 0.81 to 18.0 µm.

Coefficients as stored

C_i	Value
C1	11.62264
C2	0.43221
C3	0.0
C4	0.15597
C5	1.0
C6	18868.52
C7	0.0
C8	3953.34
C9	1.0

Comments and conditions

Ordinary ray (o) 20–22 °C.

Conditions

temperature: 294 K
direction: o

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(o) 0.81–18 µm: n and k versus wavelength
λ (µm)	n
0.81	2.777272
0.81632	2.774135
0.822689	2.771072
0.829108	2.768081
0.835577	2.765159
0.842097	2.762305
0.848667	2.759517
0.855289	2.756792
0.861962	2.75413
0.868688	2.751527
0.875466	2.748983
0.882296	2.746495
0.88918	2.744062
0.896118	2.741683
0.90311	2.739356
0.910157	2.73708
0.917258	2.734853
0.924415	2.732674
0.931628	2.730542
0.938897	2.728455
0.946222	2.726412
0.953605	2.724412
0.961046	2.722454
0.968544	2.720538
0.976101	2.71866
0.983717	2.716822
0.991392	2.715022
0.999128	2.713258
1.00692	2.71153
1.01478	2.709838
1.0227	2.708179
1.03068	2.706554
1.03872	2.704961
1.04682	2.7034
1.05499	2.70187
1.06322	2.700371
1.07152	2.698901
1.07988	2.697459
1.0883	2.696046
1.0968	2.69466
1.10535	2.693301
1.11398	2.691969
1.12267	2.690662
1.13143	2.689379
1.14026	2.688122
1.14915	2.686888
1.15812	2.685678
1.16716	2.68449
1.17626	2.683325
1.18544	2.682182
1.19469	2.68106
1.20401	2.679959
1.21341	2.678878
1.22287	2.677817
1.23242	2.676776
1.24203	2.675754
1.25172	2.674751
1.26149	2.673766
1.27133	2.672799
1.28125	2.671849
1.29125	2.670917
1.30132	2.670001
1.31148	2.669102
1.32171	2.668219
1.33202	2.667352
1.34241	2.6665
1.35289	2.665664
1.36344	2.664842
1.37408	2.664034
1.3848	2.663241
1.39561	2.662462
1.4065	2.661697
1.41747	2.660944
1.42853	2.660205
1.43968	2.659479
1.45091	2.658765
1.46223	2.658064
1.47364	2.657375
1.48514	2.656697
1.49673	2.656031
1.5084	2.655377
1.52017	2.654733
1.53203	2.654101
1.54399	2.653479
1.55603	2.652868
1.56818	2.652267
1.58041	2.651676
1.59274	2.651095
1.60517	2.650524
1.61769	2.649962
1.63032	2.64941
1.64304	2.648867
1.65586	2.648332
1.66878	2.647807
1.6818	2.64729
1.69492	2.646782
1.70814	2.646282
1.72147	2.64579
1.7349	2.645306
1.74844	2.64483
1.76208	2.644361
1.77583	2.643901
1.78968	2.643447
1.80365	2.643001
1.81772	2.642562
1.8319	2.64213
1.8462	2.641705
1.8606	2.641286
1.87512	2.640874
1.88975	2.640469
1.90449	2.64007
1.91935	2.639677
1.93433	2.63929
1.94942	2.638909
1.96463	2.638534
1.97996	2.638165
1.99541	2.637802
2.01098	2.637444
2.02667	2.637092
2.04248	2.636745
2.05842	2.636403
2.07448	2.636066
2.09067	2.635734
2.10698	2.635408
2.12342	2.635086
2.13999	2.634769
2.15668	2.634456
2.17351	2.634148
2.19047	2.633845
2.20756	2.633546
2.22478	2.633252
2.24214	2.632961
2.25964	2.632675
2.27727	2.632393
2.29504	2.632115
2.31294	2.631841
2.33099	2.63157
2.34918	2.631304
2.36751	2.631041
2.38598	2.630782
2.4046	2.630526
2.42336	2.630274
2.44227	2.630025
2.46132	2.629779
2.48053	2.629537
2.49988	2.629298
2.51938	2.629062
2.53904	2.62883
2.55885	2.6286
2.57882	2.628373
2.59894	2.628149
2.61922	2.627928
2.63965	2.62771
2.66025	2.627494
2.68101	2.627281
2.70192	2.627071
2.72301	2.626863
2.74425	2.626658
2.76566	2.626455
2.78724	2.626254
2.80899	2.626056
2.83091	2.62586
2.85299	2.625667
2.87526	2.625475
2.89769	2.625286
2.9203	2.625098
2.94308	2.624913
2.96605	2.62473
2.98919	2.624548
3.01251	2.624369
3.03602	2.624191
3.05971	2.624015
3.08358	2.623841
3.10764	2.623668
3.13189	2.623498
3.15632	2.623328
3.18095	2.623161
3.20577	2.622994
3.23078	2.62283
3.25599	2.622666
3.28139	2.622505
3.307	2.622344
3.3328	2.622185
3.3588	2.622027
3.38501	2.62187
3.41142	2.621714
3.43804	2.62156
3.46486	2.621407
3.4919	2.621254
3.51914	2.621103
3.5466	2.620953
3.57427	2.620804
3.60216	2.620655
3.63027	2.620508
3.65859	2.620361
3.68714	2.620215
3.71591	2.62007
3.7449	2.619925
3.77412	2.619782
3.80357	2.619639
3.83324	2.619496
3.86315	2.619354
3.89329	2.619213
3.92367	2.619072
3.95429	2.618932
3.98514	2.618792
4.01623	2.618652
4.04757	2.618513
4.07915	2.618374
4.11098	2.618235
4.14305	2.618097
4.17538	2.617959
4.20796	2.617821
4.24079	2.617683
4.27388	2.617546
4.30723	2.617408
4.34083	2.617271
4.3747	2.617133
4.40883	2.616996
4.44323	2.616858
4.4779	2.616721
4.51284	2.616583
4.54805	2.616445
4.58354	2.616307
4.6193	2.616169
4.65534	2.61603
4.69167	2.615891
4.72827	2.615752
4.76516	2.615613
4.80234	2.615473
4.83981	2.615332
4.87758	2.615191
4.91563	2.61505
4.95399	2.614908
4.99264	2.614766
5.0316	2.614623
5.07085	2.614479
5.11042	2.614334
5.15029	2.614189
5.19048	2.614043
5.23098	2.613897
5.27179	2.613749
5.31292	2.613601
5.35438	2.613451
5.39615	2.613301
5.43826	2.61315
5.48069	2.612998
5.52345	2.612844
5.56655	2.61269
5.60998	2.612534
5.65375	2.612378
5.69787	2.61222
5.74232	2.612061
5.78713	2.6119
5.83228	2.611738
5.87779	2.611575
5.92365	2.611411
5.96987	2.611244
6.01645	2.611077
6.06339	2.610908
6.1107	2.610737
6.15838	2.610565
6.20643	2.610391
6.25485	2.610215
6.30366	2.610037
6.35284	2.609858
6.40241	2.609677
6.45236	2.609494
6.50271	2.609309
6.55344	2.609122
6.60458	2.608933
6.65611	2.608741
6.70804	2.608548
6.76038	2.608353
6.81313	2.608155
6.86629	2.607955
6.91986	2.607752
6.97385	2.607547
7.02827	2.60734
7.0831	2.60713
7.13837	2.606918
7.19407	2.606703
7.2502	2.606485
7.30677	2.606265
7.36378	2.606042
7.42123	2.605816
7.47914	2.605587
7.53749	2.605355
7.5963	2.60512
7.65557	2.604882
7.71531	2.60464
7.7755	2.604396
7.83617	2.604148
7.89731	2.603897
7.95893	2.603643
8.02103	2.603385
8.08361	2.603123
8.14669	2.602858
8.21025	2.602589
8.27431	2.602316
8.33887	2.60204
8.40393	2.601759
8.4695	2.601475
8.53559	2.601186
8.60219	2.600894
8.6693	2.600597
8.73695	2.600296
8.80512	2.59999
8.87382	2.59968
8.94305	2.599365
9.01283	2.599046
9.08315	2.598722
9.15402	2.598393
9.22545	2.598059
9.29743	2.59772
9.36997	2.597376
9.44308	2.597027
9.51676	2.596673
9.59101	2.596313
9.66585	2.595948
9.74126	2.595577
9.81727	2.5952
9.89387	2.594817
9.97107	2.594429
10.0489	2.594035
10.1273	2.593634
10.2063	2.593227
10.2859	2.592814
10.3662	2.592394
10.4471	2.591968
10.5286	2.591534
10.6107	2.591094
10.6935	2.590647
10.7769	2.590193
10.861	2.589732
10.9458	2.589263
11.0312	2.588786
11.1172	2.588302
11.204	2.58781
11.2914	2.587311
11.3795	2.586803
11.4683	2.586286
11.5578	2.585762
11.648	2.585228
11.7388	2.584686
11.8304	2.584135
11.9227	2.583575
12.0158	2.583006
12.1095	2.582427
12.204	2.581839
12.2992	2.58124
12.3952	2.580632
12.4919	2.580014
12.5894	2.579385
12.6876	2.578746
12.7866	2.578096
12.8864	2.577435
12.9869	2.576763
13.0882	2.576079
13.1903	2.575384
13.2933	2.574677
13.397	2.573958
13.5015	2.573226
13.6069	2.572482
13.713	2.571725
13.82	2.570955
13.9278	2.570172
14.0365	2.569376
14.146	2.568565
14.2564	2.56774
14.3676	2.566901
14.4798	2.566047
14.5927	2.565179
14.7066	2.564295
14.8213	2.563395
14.937	2.56248
15.0535	2.561548
15.171	2.5606
15.2893	2.559635
15.4086	2.558652
15.5289	2.557652
15.65	2.556634
15.7721	2.555598
15.8952	2.554543
16.0192	2.55347
16.1442	2.552376
16.2702	2.551263
16.3971	2.550129
16.5251	2.548975
16.654	2.5478
16.7839	2.546603
16.9149	2.545383
17.0469	2.544142
17.1799	2.542877
17.3139	2.541589
17.449	2.540276
17.5852	2.53894
17.7224	2.537578
17.8606	2.53619
18	2.534776

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-o.yml
ID: ds_5b698a2ce4da
API: /v1/datasets/ds_5b698a2ce4da

Plot