Optical constants

Refractive index of L-BBH2 (OHARA)

L-BBH2: n,k 0.3–2.4 µm

Data: formula 2 + tabulated k
Range: 0.3–2.4 µm
Temperature: 298 K
Licence: CC0-1.0

Axis Log x Log y

Click the plot to set the calculator wavelength. Note: k data cover 420-2400 nm only; k = 0 elsewhere in the n range 300-2400 nm.

At one wavelength

Refractive index n: 2.10299
Extinction coefficient k: 6.26283e-08

Permittivity ε₁: 4.42256
Permittivity ε₂: 2.63413e-07

Absorption coefficient α: 0.0133936 cm⁻¹
Penetration depth δ = λ/(2πk): 1.49325e+09 nm

Abbe number V_d: 18.051
Chromatic dispersion dn/dλ: -0.300614 µm⁻¹

Group index n_g: 2.27963
Group velocity dispersion: 664.266 fs²/mm

Dispersion parameter D: -3623.92 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

# L-BBH2 (OHARA): L-BBH2
ohara_l_bbh2 = ls.fetch_refractiveindex("specs", "OHARA-optical", "L-BBH2", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ohara_l_bbh2.range_nm)  # (300, 2400) nm
eps = ohara_l_bbh2.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_3c9cd2e6e9d7/lightsmith"
ohara_l_bbh2 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ohara_l_bbh2.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ohara-l-bbh2/ohara).

# ... load ohara_l_bbh2 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ohara_l_bbh2)],
    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_3c9cd2e6e9d7/lightsmith?model=drude_lorentz"
ohara_l_bbh2_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{2.53279005 λ^{2}}{λ^{2} - 0.0186909889} + \frac{0.583375125 λ^{2}}{λ^{2} - 0.0765409078} + \frac{1.5299288 λ^{2}}{λ^{2} - 112.197368}

Valid from 0.3 to 2.4 µm.

Coefficients as stored

C_i	Value
C1	0.0
C2	2.53279005
C3	0.0186909889
C4	0.583375125
C5	0.0765409078
C6	1.5299288
C7	112.197368

Comments and conditions

Low Softening Temperature

Conditions

temperature: 298 K

Properties

thermal dispersion: type: formula A, coefficients: 1.61e-05 2.23e-08 -5.18e-11 3.36e-06 3.2e-09 0.311
nd: 2.102999
Vd: 18.051064
glass status: preferred
density: value: 6740
thermal expansion: value: 8.4e-06, temperature range: 243 343
dPgF: 0.0439
resistance: acid: 52.1; climatic: 2.0; phosphate: 2.0

Thermo-optic coefficient

Schott thermal-dispersion model (reference temperature 298.0 K): dn/dT = 2.19e-05 K⁻¹ at 633 nm, dn/dT = 1.40e-05 K⁻¹ at 1310 nm, dn/dT = 1.35e-05 K⁻¹ at 1550 nm

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

k data cover 420-2400 nm only; k = 0 elsewhere in the n range 300-2400 nm

References

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp)
See also OHARA glass data sheets

Cite

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp); See also OHARA 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 417 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

L-BBH2 (OHARA), L-BBH2: n and k versus wavelength
λ (µm)	n	k
0.3	2.845422	0
0.301568	2.805445	0
0.303143	2.769401	0
0.304727	2.73671	0
0.30632	2.706903	0
0.30792	2.679597	0
0.309529	2.654473	0
0.311147	2.631266	0
0.312772	2.609752	0
0.314407	2.589743	0
0.316049	2.571075	0
0.317701	2.553612	0
0.319361	2.537232	0
0.32103	2.521831	0
0.322707	2.507319	0
0.324393	2.493615	0
0.326088	2.480649	0
0.327792	2.468359	0
0.329505	2.45669	0
0.331227	2.445592	0
0.332958	2.435021	0
0.334697	2.424939	0
0.336446	2.415308	0
0.338204	2.406098	0
0.339971	2.39728	0
0.341748	2.388826	0
0.343534	2.380713	0
0.345329	2.37292	0
0.347133	2.365426	0
0.348947	2.358213	0
0.35077	2.351264	0
0.352603	2.344565	0
0.354446	2.3381	0
0.356298	2.331857	0
0.358159	2.325824	0
0.360031	2.31999	0
0.361912	2.314343	0
0.363803	2.308876	0
0.365704	2.303578	0
0.367615	2.298441	0
0.369536	2.293458	0
0.371467	2.288622	0
0.373408	2.283925	0
0.375359	2.279361	0
0.37732	2.274925	0
0.379292	2.270611	0
0.381274	2.266413	0
0.383266	2.262326	0
0.385269	2.258347	0
0.387282	2.25447	0
0.389305	2.250692	0
0.39134	2.247008	0
0.393384	2.243415	0
0.39544	2.23991	0
0.397506	2.236488	0
0.399583	2.233148	0
0.401671	2.229886	0
0.40377	2.2267	0
0.40588	2.223585	0
0.408001	2.220542	0
0.410133	2.217565	0
0.412276	2.214654	0
0.41443	2.211807	0
0.416595	2.20902	0
0.418772	2.206293	0
0.42	2.204786	3.705400e-06
0.42096	2.203623	3.556792e-06
0.42316	2.201008	3.216410e-06
0.425371	2.198448	2.874249e-06
0.427594	2.195939	2.530301e-06
0.429828	2.193481	2.184555e-06
0.432074	2.191071	1.837003e-06
0.434332	2.18871	1.487634e-06
0.436601	2.186394	1.136441e-06
0.438882	2.184124	7.834117e-07
0.44	2.183032	6.104800e-07
0.441176	2.181896	5.858564e-07
0.443481	2.179712	5.375776e-07
0.445798	2.177568	4.890465e-07
0.448128	2.175464	4.402618e-07
0.450469	2.1734	3.912222e-07
0.452823	2.171373	3.419264e-07
0.455189	2.169383	2.923730e-07
0.457568	2.167428	2.425607e-07
0.459959	2.165509	1.924881e-07
0.46	2.165476	1.916200e-07
0.462362	2.163624	1.808743e-07
0.464778	2.161772	1.698830e-07
0.467206	2.159953	1.588342e-07
0.469648	2.158165	1.477276e-07
0.472102	2.156407	1.365631e-07
0.474569	2.15468	1.253402e-07
0.477048	2.152982	1.140586e-07
0.479541	2.151313	1.027181e-07
0.48	2.151009	1.006300e-07
0.482047	2.149671	9.731347e-08
0.484566	2.148057	9.323199e-08
0.487098	2.146469	8.912919e-08
0.489643	2.144908	8.500495e-08
0.492201	2.143372	8.085915e-08
0.494773	2.14186	7.669170e-08
0.497358	2.140373	7.250247e-08
0.499957	2.13891	6.829135e-08
0.5	2.138886	6.822200e-08
0.50257	2.137469	6.720387e-08
0.505196	2.136052	6.616338e-08
0.507835	2.134657	6.511745e-08
0.510489	2.133283	6.406606e-08
0.513156	2.131931	6.300917e-08
0.515838	2.130599	6.194676e-08
0.518533	2.129288	6.087880e-08
0.521243	2.127997	5.980526e-08
0.523966	2.126725	5.872611e-08
0.526704	2.125473	5.764132e-08
0.529456	2.124239	5.655086e-08
0.532223	2.123023	5.545470e-08
0.535004	2.121826	5.435282e-08
0.537799	2.120646	5.324518e-08
0.540609	2.119484	5.213175e-08
0.543434	2.118338	5.101250e-08
0.546274	2.117209	4.988741e-08
0.549128	2.116096	4.875643e-08
0.55	2.115761	4.841100e-08
0.551998	2.115	4.916630e-08
0.554882	2.113919	5.025692e-08
0.557781	2.112853	5.135323e-08
0.560696	2.111802	5.245528e-08
0.563626	2.110767	5.356308e-08
0.566571	2.109745	5.467667e-08
0.569531	2.108738	5.579609e-08
0.572507	2.107745	5.692135e-08
0.575498	2.106766	5.805249e-08
0.578506	2.1058	5.918954e-08
0.581528	2.104848	6.033253e-08
0.584567	2.103908	6.148149e-08
0.587622	2.102981	6.263646e-08
0.590692	2.102067	6.379746e-08
0.593779	2.101165	6.496453e-08
0.596881	2.100275	6.613770e-08
0.6	2.099397	6.731700e-08
0.603135	2.098531	6.766876e-08
0.606287	2.097676	6.802236e-08
0.609455	2.096833	6.837781e-08
0.612639	2.096	6.873512e-08
0.61584	2.095179	6.909429e-08
0.619058	2.094368	6.945534e-08
0.622293	2.093567	6.981828e-08
0.625545	2.092778	7.018311e-08
0.628813	2.091998	7.054985e-08
0.632099	2.091228	7.091850e-08
0.635402	2.090468	7.128909e-08
0.638722	2.089718	7.166160e-08
0.642059	2.088977	7.203607e-08
0.645414	2.088246	7.241249e-08
0.648787	2.087524	7.279088e-08
0.65	2.087267	7.292700e-08
0.652177	2.086811	7.267980e-08
0.655585	2.086107	7.229281e-08
0.65901	2.085411	7.190380e-08
0.662454	2.084724	7.151276e-08
0.665915	2.084046	7.111967e-08
0.669395	2.083376	7.072453e-08
0.672892	2.082715	7.032733e-08
0.676409	2.082061	6.992805e-08
0.679943	2.081415	6.952668e-08
0.683496	2.080778	6.912322e-08
0.687067	2.080148	6.871765e-08
0.690657	2.079525	6.830996e-08
0.694266	2.07891	6.790014e-08
0.697894	2.078303	6.748817e-08
0.7	2.077955	6.724900e-08
0.701541	2.077702	6.709966e-08
0.705206	2.077109	6.674431e-08
0.708891	2.076523	6.638710e-08
0.712595	2.075943	6.602802e-08
0.716319	2.075371	6.566707e-08
0.720062	2.074805	6.530423e-08
0.723824	2.074246	6.493949e-08
0.727606	2.073693	6.457285e-08
0.731408	2.073147	6.420429e-08
0.73523	2.072607	6.383381e-08
0.739072	2.072073	6.346139e-08
0.742934	2.071545	6.308702e-08
0.746816	2.071024	6.271070e-08
0.750718	2.070508	6.233241e-08
0.754641	2.069998	6.195215e-08
0.758584	2.069494	6.156990e-08
0.762547	2.068996	6.118565e-08
0.766532	2.068503	6.079939e-08
0.770537	2.068016	6.041112e-08
0.774564	2.067534	6.002081e-08
0.778611	2.067057	5.962847e-08
0.782679	2.066586	5.923408e-08
0.786769	2.06612	5.883762e-08
0.79088	2.065659	5.843910e-08
0.795012	2.065203	5.803849e-08
0.799167	2.064752	5.763579e-08
0.8	2.064662	5.755500e-08
0.803342	2.064305	5.635048e-08
0.80754	2.063864	5.483777e-08
0.81176	2.063427	5.331716e-08
0.816001	2.062996	5.178860e-08
0.820265	2.062568	5.025205e-08
0.824551	2.062145	4.870748e-08
0.82886	2.061727	4.715483e-08
0.833191	2.061313	4.559407e-08
0.837544	2.060904	4.402516e-08
0.841921	2.060498	4.244805e-08
0.84632	2.060097	4.086270e-08
0.850742	2.0597	3.926906e-08
0.855187	2.059307	3.766710e-08
0.859656	2.058918	3.605676e-08
0.864148	2.058534	3.443801e-08
0.868663	2.058153	3.281081e-08
0.873202	2.057776	3.117510e-08
0.877765	2.057402	2.953084e-08
0.882351	2.057033	2.787799e-08
0.886962	2.056667	2.621651e-08
0.891597	2.056304	2.454634e-08
0.896255	2.055946	2.286745e-08
0.9	2.055661	2.151800e-08
0.900939	2.055591	2.161539e-08
0.905646	2.055239	2.210390e-08
0.910378	2.054891	2.259496e-08
0.915135	2.054546	2.308859e-08
0.919917	2.054204	2.358480e-08
0.924724	2.053866	2.408360e-08
0.929556	2.053531	2.458500e-08
0.934413	2.053199	2.508903e-08
0.939295	2.05287	2.559569e-08
0.944204	2.052544	2.610500e-08
0.949137	2.052222	2.661697e-08
0.954097	2.051902	2.713161e-08
0.959082	2.051585	2.764894e-08
0.964093	2.051271	2.816898e-08
0.969131	2.05096	2.869173e-08
0.974195	2.050652	2.921722e-08
0.979285	2.050346	2.974545e-08
0.984402	2.050044	3.027644e-08
0.989546	2.049744	3.081021e-08
0.994717	2.049446	3.134676e-08
0.999914	2.049151	3.188612e-08
1	2.049147	3.189500e-08
1.00514	2.048859	3.205891e-08
1.01039	2.048569	3.222643e-08
1.01567	2.048282	3.239482e-08
1.02098	2.047997	3.256409e-08
1.02631	2.047715	3.273425e-08
1.03168	2.047435	3.290529e-08
1.03707	2.047157	3.307723e-08
1.04249	2.046881	3.325007e-08
1.04793	2.046608	3.342380e-08
1.05341	2.046337	3.359845e-08
1.05891	2.046068	3.377401e-08
1.06445	2.045801	3.395049e-08
1.07001	2.045537	3.412789e-08
1.0756	2.045274	3.430621e-08
1.08122	2.045014	3.448547e-08
1.08687	2.044755	3.466567e-08
1.09255	2.044499	3.484680e-08
1.09826	2.044244	3.502889e-08
1.104	2.043991	3.521192e-08
1.10976	2.04374	3.539591e-08
1.11556	2.043491	3.558086e-08
1.12139	2.043244	3.576678e-08
1.12725	2.042999	3.595367e-08
1.13314	2.042755	3.614154e-08
1.13906	2.042513	3.633039e-08
1.14501	2.042272	3.652022e-08
1.151	2.042034	3.671105e-08
1.15701	2.041797	3.690287e-08
1.16306	2.041561	3.709570e-08
1.16913	2.041327	3.728953e-08
1.17524	2.041094	3.748438e-08
1.18138	2.040863	3.768024e-08
1.18756	2.040634	3.787713e-08
1.19376	2.040406	3.807505e-08
1.2	2.040179	3.827400e-08
1.2	2.040179	3.827400e-08
1.20627	2.039954	3.847399e-08
1.21257	2.03973	3.867503e-08
1.21891	2.039507	3.887711e-08
1.22528	2.039286	3.908025e-08
1.23168	2.039065	3.928446e-08
1.23812	2.038847	3.948973e-08
1.24459	2.038629	3.969607e-08
1.25109	2.038412	3.990349e-08
1.25763	2.038197	4.011200e-08
1.2642	2.037983	4.032159e-08
1.2708	2.037769	4.053228e-08
1.27744	2.037557	4.074407e-08
1.28412	2.037346	4.095697e-08
1.29083	2.037136	4.117098e-08
1.29757	2.036927	4.138611e-08
1.30435	2.036719	4.160236e-08
1.31117	2.036512	4.181974e-08
1.31802	2.036306	4.203826e-08
1.32491	2.0361	4.225792e-08
1.33183	2.035896	4.247873e-08
1.33879	2.035692	4.270069e-08
1.34578	2.035489	4.292381e-08
1.35282	2.035287	4.314810e-08
1.35989	2.035086	4.337356e-08
1.36699	2.034885	4.360020e-08
1.37413	2.034685	4.382802e-08
1.38131	2.034486	4.405703e-08
1.38853	2.034288	4.428724e-08
1.39579	2.03409	4.451865e-08
1.4	2.033976	4.465300e-08
1.40308	2.033892	4.573840e-08
1.41041	2.033696	4.832115e-08
1.41778	2.0335	5.091740e-08
1.42519	2.033304	5.352721e-08
1.43264	2.033109	5.615066e-08
1.44012	2.032914	5.878782e-08
1.44765	2.03272	6.143876e-08
1.45521	2.032527	6.410355e-08
1.46282	2.032333	6.678227e-08
1.47046	2.03214	6.947498e-08
1.47814	2.031948	7.218177e-08
1.48587	2.031756	7.490269e-08
1.49363	2.031564	7.763783e-08
1.50144	2.031372	8.038727e-08
1.50928	2.031181	8.315107e-08
1.51717	2.03099	8.592931e-08
1.52509	2.0308	8.872208e-08
1.53306	2.030609	9.152943e-08
1.54107	2.030419	9.435145e-08
1.54913	2.030228	9.718822e-08
1.55722	2.030038	1.000398e-07
1.56536	2.029848	1.029063e-07
1.57354	2.029659	1.057878e-07
1.58176	2.029469	1.086843e-07
1.59002	2.029279	1.115960e-07
1.59833	2.029089	1.145228e-07
1.6	2.029051	1.151100e-07
1.60668	2.0289	1.189849e-07
1.61508	2.02871	1.238513e-07
1.62352	2.02852	1.287430e-07
1.632	2.02833	1.336604e-07
1.64053	2.02814	1.386034e-07
1.6491	2.02795	1.435722e-07
1.65772	2.02776	1.485670e-07
1.66638	2.02757	1.535880e-07
1.67509	2.027379	1.586351e-07
1.68384	2.027188	1.637086e-07
1.69264	2.026997	1.688087e-07
1.70148	2.026806	1.739354e-07
1.71037	2.026615	1.790888e-07
1.71931	2.026423	1.842692e-07
1.7283	2.026231	1.894767e-07
1.73733	2.026038	1.947114e-07
1.7464	2.025845	1.999734e-07
1.75553	2.025652	2.052629e-07
1.7647	2.025458	2.105801e-07
1.77392	2.025264	2.159250e-07
1.78319	2.025069	2.212979e-07
1.79251	2.024874	2.266989e-07
1.8	2.024718	2.310400e-07
1.80188	2.024678	2.337296e-07
1.81129	2.024482	2.472207e-07
1.82076	2.024285	2.607823e-07
1.83027	2.024088	2.744147e-07
1.83983	2.02389	2.881184e-07
1.84945	2.023691	3.018937e-07
1.85911	2.023492	3.157410e-07
1.86883	2.023292	3.296606e-07
1.87859	2.023091	3.436529e-07
1.88841	2.02289	3.577184e-07
1.89827	2.022687	3.718574e-07
1.90819	2.022484	3.860702e-07
1.91816	2.02228	4.003573e-07
1.92819	2.022076	4.147191e-07
1.93826	2.02187	4.291559e-07
1.94839	2.021663	4.436681e-07
1.95857	2.021456	4.582562e-07
1.9688	2.021248	4.729205e-07
1.97909	2.021038	4.876614e-07
1.98943	2.020828	5.024793e-07
1.99983	2.020616	5.173747e-07
2	2.020613	5.176200e-07
2.01028	2.020404	5.748851e-07
2.02078	2.02019	6.334080e-07
2.03134	2.019975	6.922368e-07
2.04196	2.019759	7.513730e-07
2.05263	2.019542	8.108182e-07
2.06335	2.019324	8.705740e-07
2.07413	2.019105	9.306421e-07
2.08497	2.018884	9.910240e-07
2.09586	2.018662	1.051721e-06
2.10682	2.018438	1.112736e-06
2.11782	2.018213	1.174069e-06
2.12889	2.017987	1.235723e-06
2.14001	2.01776	1.297699e-06
2.1512	2.017531	1.359999e-06
2.16244	2.0173	1.422625e-06
2.17374	2.017068	1.485577e-06
2.1851	2.016835	1.548859e-06
2.19651	2.0166	1.612471e-06
2.2	2.016528	1.631900e-06
2.20799	2.016363	1.727485e-06
2.21953	2.016125	1.865505e-06
2.23112	2.015885	2.004247e-06
2.24278	2.015643	2.143713e-06
2.2545	2.015399	2.283908e-06
2.26628	2.015154	2.424836e-06
2.27812	2.014907	2.566500e-06
2.29003	2.014658	2.708905e-06
2.30199	2.014408	2.852053e-06
2.31402	2.014155	2.995950e-06
2.32611	2.0139	3.140598e-06
2.33827	2.013644	3.286003e-06
2.35049	2.013385	3.432167e-06
2.36277	2.013125	3.579094e-06
2.37511	2.012862	3.726790e-06
2.38752	2.012597	3.875257e-06
2.4	2.01233	4.024500e-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: —

L-BBH2 (OHARA): all datasets

BBH (Barium borate, high-index)

L-BBH2 n,k 0.3–2.4 µm default

About L-BBH2 (OHARA)

Ohara Group is an international group of companies with headquarters in Japan and subsidiaries in Japan (Ohara, Inc.), United States (Ohara Corporation), and Germany (Ohara, GmbH). Ohara is known for its specialization in high-quality optical glass, ceramics, and other advanced materials. With a history spanning over a century, Ohara has been at the forefront of optical innovations, producing a wide range of specialized glass types including low-dispersion and high-refractive-index materials. These are used in various demanding applications like telescopes, microscopes, and high-performance camera lenses. The company's commitment to research and development has led to groundbreaking products such as low thermal expansion glass-ceramics and other specialty materials used in semiconductor manufacturing and space telescopes. With stringent quality control procedures, Ohara ensures that its optical glass meets the highest standards of clarity, consistency, and performance. Their materials are widely regarded for their exceptional quality and are often used in scientific research, aerospace, and other fields where precision and reliability are paramount. Ohara's reputation for technical excellence and innovation makes it a key player in the global optics and materials science industries, providing cutting-edge solutions for a range of complex applications.

More about L-BBH2 (OHARA) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/specs/ohara/optical/L-BBH2.yml
ID: ds_3c9cd2e6e9d7
API: /v1/datasets/ds_3c9cd2e6e9d7

Plot