Optical constants

Refractive index of F2G12 (SCHOTT)

F2G12: n,k 0.39–2.5 µm

Data: formula 2 + tabulated k
Range: 0.39–2.5 µm
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength. Note: k data cover 400-2500 nm only; k = 0 elsewhere in the n range 390-2500 nm.

At one wavelength

Refractive index n: 1.62072
Extinction coefficient k: 5.04273e-08

Permittivity ε₁: 2.62673
Permittivity ε₂: 1.63457e-07

Absorption coefficient α: 0.0107843 cm⁻¹
Penetration depth δ = λ/(2πk): 1.85454e+09 nm

Abbe number V_d: 36.559
Chromatic dispersion dn/dλ: -0.0861044 µm⁻¹

Group index n_g: 1.67131
Group velocity dispersion: 167.385 fs²/mm

Dispersion parameter D: -913.175 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

# F2G12 (SCHOTT): F2G12
schott_f2g12 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "F2G12", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_f2g12.range_nm)  # (390, 2500) nm
eps = schott_f2g12.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_69c2794e902e/lightsmith"
schott_f2g12 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(schott_f2g12.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (schott-f2g12/schott).

# ... load schott_f2g12 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=schott_f2g12)],
    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"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_69c2794e902e/lightsmith?model=drude_lorentz"
schott_f2g12_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 (C in µm²) (formula 2), λ in µm

n^{2} - 1 = \frac{1.34702224 λ^{2}}{λ^{2} - 0.00980850553} + \frac{0.210037763 λ^{2}}{λ^{2} - 0.0471788018} + \frac{19.5350768 λ^{2}}{λ^{2} - 2279.1547}

Valid from 0.39 to 2.5 µm.

Coefficients as stored

C_i	Value
C1	0.0
C2	1.34702224
C3	0.00980850553
C4	0.210037763
C5	0.0471788018
C6	19.5350768
C7	2279.1547

Comments and conditions

inquiry glass

Properties

nd: 1.62072
Vd: 36.56
glass code: 621366.360
glass status: special
density: value: 3601
thermal expansion: value: 8.08e-06, temperature range: 243 343; value: 8.95e-06, temperature range: 293 573
dPgF: 0.0008
resistance: acid: 1.0; stain: 0.0; alkali: 1.3; climatic: 1.0; phosphate: 2.3

Notes on the source data (kept exactly as published):

k data cover 400-2500 nm only; k = 0 elsewhere in the n range 390-2500 nm

References

SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com)
See also SCHOTT glass data sheets

Cite

SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com); See also SCHOTT glass data sheets; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 415 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

F2G12 (SCHOTT), F2G12: n and k versus wavelength
λ (µm)	n	k
0.39	1.656217	0
0.39182	1.655554	0
0.393649	1.654901	0
0.395486	1.654256	0
0.397332	1.65362	0
0.399186	1.652993	0
0.4	1.652722	3.582100e-06
0.40105	1.652375	3.403922e-06
0.402921	1.651765	3.086166e-06
0.404802	1.651164	2.766927e-06
0.405	1.651101	2.733300e-06
0.406691	1.65057	2.563241e-06
0.408589	1.649985	2.372378e-06
0.410496	1.649407	2.180624e-06
0.412412	1.648837	1.987976e-06
0.414337	1.648274	1.794427e-06
0.416271	1.647719	1.599976e-06
0.418214	1.647171	1.404617e-06
0.42	1.646676	1.225000e-06
0.420166	1.646631	1.218508e-06
0.422127	1.646097	1.141643e-06
0.424097	1.64557	1.064418e-06
0.426076	1.64505	9.868331e-07
0.428065	1.644537	9.088861e-07
0.430063	1.64403	8.305753e-07
0.43207	1.64353	7.518990e-07
0.434086	1.643036	6.728555e-07
0.436	1.642575	5.978500e-07
0.436112	1.642548	5.961641e-07
0.438148	1.642066	5.656417e-07
0.440193	1.64159	5.349769e-07
0.442247	1.64112	5.041690e-07
0.444311	1.640656	4.732173e-07
0.446385	1.640198	4.421212e-07
0.448468	1.639746	4.108799e-07
0.450562	1.639298	3.794928e-07
0.452664	1.638857	3.479592e-07
0.454777	1.63842	3.162784e-07
0.4569	1.637989	2.844498e-07
0.459032	1.637564	2.524726e-07
0.46	1.637373	2.379600e-07
0.461175	1.637143	2.340136e-07
0.463327	1.636727	2.267820e-07
0.465489	1.636316	2.195167e-07
0.467662	1.63591	2.122174e-07
0.469845	1.635509	2.048841e-07
0.472038	1.635113	1.975166e-07
0.474241	1.634721	1.901147e-07
0.476454	1.634334	1.826782e-07
0.478678	1.633951	1.752070e-07
0.480912	1.633573	1.677010e-07
0.483157	1.6332	1.601599e-07
0.485412	1.63283	1.525836e-07
0.487677	1.632465	1.449720e-07
0.489953	1.632104	1.373248e-07
0.49224	1.631747	1.296420e-07
0.494537	1.631394	1.219233e-07
0.496845	1.631045	1.141686e-07
0.499164	1.6307	1.063776e-07
0.5	1.630577	1.035700e-07
0.501494	1.630359	1.023343e-07
0.503835	1.630022	1.003985e-07
0.506186	1.629688	9.845363e-08
0.508549	1.629359	9.649969e-08
0.510922	1.629033	9.453664e-08
0.513307	1.62871	9.256442e-08
0.515703	1.628391	9.058299e-08
0.518109	1.628076	8.859232e-08
0.520528	1.627764	8.659236e-08
0.522957	1.627455	8.458306e-08
0.525398	1.62715	8.256438e-08
0.52785	1.626848	8.053629e-08
0.530314	1.62655	7.849872e-08
0.532789	1.626255	7.645165e-08
0.535275	1.625962	7.439502e-08
0.537774	1.625673	7.232880e-08
0.540283	1.625388	7.025293e-08
0.542805	1.625105	6.816737e-08
0.545339	1.624825	6.607208e-08
0.546	1.624753	6.552500e-08
0.547884	1.624548	6.479953e-08
0.550441	1.624274	6.381474e-08
0.55301	1.624003	6.282536e-08
0.555591	1.623735	6.183136e-08
0.558184	1.623469	6.083272e-08
0.560789	1.623207	5.982941e-08
0.563407	1.622947	5.882143e-08
0.566036	1.62269	5.780874e-08
0.568678	1.622435	5.679133e-08
0.571332	1.622183	5.576916e-08
0.573999	1.621934	5.474223e-08
0.576678	1.621687	5.371050e-08
0.579369	1.621443	5.267396e-08
0.58	1.621386	5.243100e-08
0.582073	1.621201	5.188440e-08
0.58479	1.620962	5.116815e-08
0.587519	1.620725	5.044855e-08
0.590261	1.620491	4.972560e-08
0.593016	1.620259	4.899927e-08
0.595784	1.620029	4.826955e-08
0.598565	1.619801	4.753643e-08
0.601358	1.619576	4.679988e-08
0.604165	1.619353	4.605990e-08
0.606985	1.619132	4.531646e-08
0.609818	1.618914	4.456956e-08
0.612664	1.618697	4.381916e-08
0.615523	1.618483	4.306527e-08
0.618396	1.618271	4.230786e-08
0.62	1.618154	4.188500e-08
0.621282	1.618061	4.162853e-08
0.624182	1.617853	4.104859e-08
0.627095	1.617646	4.046595e-08
0.630022	1.617442	3.988059e-08
0.632963	1.61724	3.929250e-08
0.635917	1.61704	3.870166e-08
0.638885	1.616842	3.810806e-08
0.641867	1.616645	3.751169e-08
0.644862	1.616451	3.691254e-08
0.647872	1.616258	3.631060e-08
0.650896	1.616067	3.570584e-08
0.653934	1.615878	3.509826e-08
0.656986	1.615691	3.448785e-08
0.66	1.615508	3.388500e-08
0.660052	1.615505	3.387591e-08
0.663133	1.615321	3.333795e-08
0.666228	1.615139	3.279749e-08
0.669337	1.614959	3.225450e-08
0.672461	1.61478	3.170898e-08
0.6756	1.614603	3.116091e-08
0.678753	1.614427	3.061029e-08
0.681921	1.614253	3.005709e-08
0.685103	1.614081	2.950131e-08
0.688301	1.61391	2.894294e-08
0.691513	1.613741	2.838196e-08
0.694741	1.613573	2.781837e-08
0.697983	1.613407	2.725214e-08
0.7	1.613305	2.690000e-08
0.701241	1.613242	2.684221e-08
0.704514	1.613079	2.668981e-08
0.707802	1.612917	2.653670e-08
0.711106	1.612756	2.638288e-08
0.714425	1.612597	2.622834e-08
0.717759	1.612439	2.607308e-08
0.721109	1.612283	2.591709e-08
0.724474	1.612128	2.576037e-08
0.727856	1.611974	2.560293e-08
0.731253	1.611822	2.544475e-08
0.734666	1.611671	2.528583e-08
0.738095	1.611521	2.512617e-08
0.74154	1.611373	2.496576e-08
0.745	1.611225	2.480460e-08
0.748478	1.611079	2.464270e-08
0.751971	1.610934	2.448003e-08
0.755481	1.610791	2.431661e-08
0.759007	1.610648	2.415243e-08
0.762549	1.610507	2.398748e-08
0.766108	1.610367	2.382175e-08
0.769684	1.610228	2.365526e-08
0.773276	1.61009	2.348799e-08
0.776885	1.609953	2.331994e-08
0.780511	1.609817	2.315110e-08
0.784154	1.609683	2.298147e-08
0.787814	1.609549	2.281106e-08
0.791491	1.609416	2.263985e-08
0.795185	1.609285	2.246784e-08
0.798896	1.609154	2.229502e-08
0.802625	1.609025	2.212140e-08
0.806371	1.608896	2.194697e-08
0.810134	1.608769	2.177173e-08
0.813915	1.608642	2.159566e-08
0.817714	1.608517	2.141878e-08
0.82153	1.608392	2.124107e-08
0.825365	1.608268	2.106253e-08
0.829217	1.608145	2.088316e-08
0.833087	1.608023	2.070295e-08
0.836975	1.607902	2.052190e-08
0.840882	1.607782	2.034000e-08
0.844806	1.607662	2.015726e-08
0.848749	1.607544	1.997366e-08
0.852711	1.607426	1.978920e-08
0.85669	1.607309	1.960389e-08
0.860689	1.607193	1.941771e-08
0.864706	1.607078	1.923066e-08
0.868742	1.606963	1.904274e-08
0.872796	1.60685	1.885394e-08
0.87687	1.606737	1.866426e-08
0.880962	1.606624	1.847369e-08
0.885074	1.606513	1.828224e-08
0.889205	1.606402	1.808989e-08
0.893355	1.606292	1.789664e-08
0.897524	1.606183	1.770249e-08
0.901713	1.606074	1.750744e-08
0.905922	1.605966	1.731147e-08
0.91015	1.605859	1.711459e-08
0.914398	1.605752	1.691679e-08
0.918666	1.605646	1.671807e-08
0.922953	1.605541	1.651842e-08
0.927261	1.605436	1.631784e-08
0.931589	1.605332	1.611633e-08
0.935937	1.605229	1.591387e-08
0.940305	1.605126	1.571046e-08
0.944694	1.605023	1.550611e-08
0.949103	1.604922	1.530081e-08
0.953532	1.60482	1.509454e-08
0.957983	1.60472	1.488732e-08
0.962454	1.60462	1.467912e-08
0.966946	1.60452	1.446996e-08
0.971459	1.604421	1.425982e-08
0.975993	1.604323	1.404869e-08
0.980548	1.604225	1.383659e-08
0.985125	1.604127	1.362349e-08
0.989722	1.60403	1.340940e-08
0.994342	1.603934	1.319430e-08
0.998983	1.603838	1.297821e-08
1.00365	1.603742	1.276110e-08
1.00833	1.603647	1.254299e-08
1.01304	1.603552	1.232385e-08
1.01776	1.603458	1.210369e-08
1.02251	1.603364	1.188251e-08
1.02729	1.603271	1.166029e-08
1.03208	1.603178	1.143703e-08
1.0369	1.603085	1.121274e-08
1.04174	1.602993	1.098739e-08
1.0466	1.602901	1.076100e-08
1.05148	1.602809	1.053355e-08
1.05639	1.602718	1.030503e-08
1.06	1.602652	1.013700e-08
1.06132	1.602628	1.025999e-08
1.06628	1.602537	1.072088e-08
1.07125	1.602447	1.118392e-08
1.07625	1.602357	1.164913e-08
1.08127	1.602268	1.211650e-08
1.08632	1.602179	1.258606e-08
1.09139	1.60209	1.305781e-08
1.09649	1.602001	1.353176e-08
1.1016	1.601913	1.400792e-08
1.10674	1.601825	1.448631e-08
1.11191	1.601737	1.496692e-08
1.1171	1.60165	1.544979e-08
1.12231	1.601563	1.593490e-08
1.12755	1.601476	1.642228e-08
1.13281	1.601389	1.691193e-08
1.1381	1.601302	1.740387e-08
1.14341	1.601216	1.789810e-08
1.14875	1.60113	1.839465e-08
1.15411	1.601044	1.889350e-08
1.1595	1.600958	1.939469e-08
1.16491	1.600873	1.989822e-08
1.17035	1.600788	2.040409e-08
1.17581	1.600703	2.091233e-08
1.1813	1.600618	2.142294e-08
1.18681	1.600533	2.193593e-08
1.19235	1.600448	2.245132e-08
1.19791	1.600364	2.296911e-08
1.2035	1.600279	2.348932e-08
1.20912	1.600195	2.401196e-08
1.21476	1.600111	2.453703e-08
1.22043	1.600027	2.506456e-08
1.22613	1.599943	2.559455e-08
1.23185	1.599859	2.612701e-08
1.2376	1.599775	2.666196e-08
1.24338	1.599691	2.719940e-08
1.24918	1.599608	2.773936e-08
1.25501	1.599524	2.828183e-08
1.26087	1.599441	2.882683e-08
1.26675	1.599357	2.937438e-08
1.27267	1.599274	2.992449e-08
1.27861	1.59919	3.047716e-08
1.28457	1.599107	3.103241e-08
1.29057	1.599024	3.159025e-08
1.29659	1.59894	3.215070e-08
1.30264	1.598857	3.271376e-08
1.30872	1.598773	3.327945e-08
1.31483	1.59869	3.384778e-08
1.32097	1.598607	3.441876e-08
1.32713	1.598523	3.499241e-08
1.33333	1.59844	3.556873e-08
1.33955	1.598356	3.614775e-08
1.3458	1.598273	3.672946e-08
1.35208	1.598189	3.731390e-08
1.35839	1.598105	3.790105e-08
1.36473	1.598022	3.849095e-08
1.3711	1.597938	3.908361e-08
1.3775	1.597854	3.967903e-08
1.38393	1.59777	4.027723e-08
1.39039	1.597686	4.087822e-08
1.39688	1.597601	4.148201e-08
1.4034	1.597517	4.208862e-08
1.40995	1.597433	4.269807e-08
1.41653	1.597348	4.331036e-08
1.42314	1.597263	4.392550e-08
1.42978	1.597178	4.454352e-08
1.43646	1.597093	4.516442e-08
1.44316	1.597008	4.578822e-08
1.4499	1.596922	4.641493e-08
1.45667	1.596837	4.704457e-08
1.46346	1.596751	4.767715e-08
1.47029	1.596665	4.831267e-08
1.47716	1.596579	4.895117e-08
1.48405	1.596492	4.959264e-08
1.49098	1.596406	5.023711e-08
1.49794	1.596319	5.088458e-08
1.50493	1.596232	5.153508e-08
1.51195	1.596145	5.218861e-08
1.51901	1.596057	5.284520e-08
1.5261	1.595969	5.350484e-08
1.53	1.595921	5.386800e-08
1.53322	1.595881	5.680375e-08
1.54038	1.595793	6.332868e-08
1.54756	1.595704	6.988406e-08
1.55479	1.595615	7.647003e-08
1.56204	1.595526	8.308674e-08
1.56933	1.595436	8.973434e-08
1.57666	1.595346	9.641296e-08
1.58402	1.595256	1.031228e-07
1.59141	1.595165	1.098639e-07
1.59884	1.595075	1.166364e-07
1.6063	1.594983	1.234406e-07
1.6138	1.594892	1.302765e-07
1.62133	1.5948	1.371444e-07
1.6289	1.594707	1.440443e-07
1.6365	1.594615	1.509764e-07
1.64414	1.594522	1.579408e-07
1.65181	1.594428	1.649378e-07
1.65952	1.594334	1.719674e-07
1.66727	1.59424	1.790298e-07
1.67505	1.594145	1.861252e-07
1.68286	1.59405	1.932537e-07
1.69072	1.593954	2.004155e-07
1.69861	1.593858	2.076107e-07
1.70654	1.593762	2.148395e-07
1.7145	1.593665	2.221020e-07
1.7225	1.593568	2.293984e-07
1.73054	1.59347	2.367289e-07
1.73862	1.593371	2.440935e-07
1.74674	1.593272	2.514926e-07
1.75489	1.593173	2.589262e-07
1.76308	1.593073	2.663945e-07
1.77131	1.592972	2.738976e-07
1.77957	1.592871	2.814358e-07
1.78788	1.59277	2.890091e-07
1.79622	1.592668	2.966178e-07
1.80461	1.592565	3.042620e-07
1.81303	1.592462	3.119419e-07
1.82149	1.592358	3.196576e-07
1.82999	1.592254	3.274093e-07
1.83853	1.592149	3.351972e-07
1.84712	1.592043	3.430215e-07
1.85574	1.591937	3.508822e-07
1.8644	1.59183	3.587797e-07
1.8731	1.591723	3.667140e-07
1.88184	1.591614	3.746854e-07
1.89062	1.591506	3.826939e-07
1.89945	1.591396	3.907399e-07
1.90831	1.591286	3.988234e-07
1.91722	1.591175	4.069446e-07
1.92617	1.591064	4.151037e-07
1.93516	1.590952	4.233009e-07
1.94419	1.590839	4.315364e-07
1.95326	1.590725	4.398102e-07
1.96238	1.590611	4.481228e-07
1.97	1.590515	4.550700e-07
1.97154	1.590495	4.594667e-07
1.98074	1.590379	4.857402e-07
1.98999	1.590263	5.121363e-07
1.99927	1.590145	5.386556e-07
2.0086	1.590027	5.652986e-07
2.01798	1.589908	5.920661e-07
2.0274	1.589788	6.189584e-07
2.03686	1.589668	6.459763e-07
2.04637	1.589546	6.731202e-07
2.05592	1.589424	7.003909e-07
2.06551	1.589301	7.277888e-07
2.07515	1.589177	7.553146e-07
2.08484	1.589052	7.829688e-07
2.09457	1.588926	8.107522e-07
2.10435	1.588799	8.386652e-07
2.11417	1.588672	8.667085e-07
2.12403	1.588543	8.948826e-07
2.13395	1.588414	9.231883e-07
2.14391	1.588283	9.516261e-07
2.15391	1.588152	9.801966e-07
2.16397	1.588019	1.008900e-06
2.17407	1.587886	1.037738e-06
2.18421	1.587752	1.066711e-06
2.19441	1.587617	1.095818e-06
2.20465	1.58748	1.125062e-06
2.21494	1.587343	1.154442e-06
2.22528	1.587204	1.183959e-06
2.23566	1.587065	1.213614e-06
2.2461	1.586925	1.243407e-06
2.25658	1.586783	1.273339e-06
2.26711	1.58664	1.303411e-06
2.27769	1.586497	1.333624e-06
2.28832	1.586352	1.363977e-06
2.299	1.586206	1.394472e-06
2.30973	1.586059	1.425109e-06
2.32051	1.58591	1.455890e-06
2.325	1.585848	1.468700e-06
2.33134	1.585761	1.498448e-06
2.34222	1.58561	1.549470e-06
2.35316	1.585458	1.600730e-06
2.36414	1.585305	1.652230e-06
2.37517	1.585151	1.703970e-06
2.38626	1.584995	1.755952e-06
2.3974	1.584839	1.808176e-06
2.40859	1.584681	1.860644e-06
2.41983	1.584521	1.913357e-06
2.43112	1.584361	1.966316e-06
2.44247	1.584199	2.019522e-06
2.45387	1.584036	2.072976e-06
2.46532	1.583871	2.126680e-06
2.47683	1.583705	2.180634e-06
2.48839	1.583538	2.234841e-06
2.5	1.583369	2.289300e-06

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: —

F2G12 (SCHOTT): all datasets

F (Flint)

F2G12 n,k 0.39–2.5 µm default

About F2G12 (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 F2G12 (SCHOTT) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/specs/schott/optical/F2G12.yml
ID: ds_69c2794e902e
API: /v1/datasets/ds_69c2794e902e

Plot