Optical constants

Refractive index of J-BAF8 (HIKARI)

J-BAF8: n,k 0.365–2.058 µm

Data
formula 3 + tabulated k
Range
0.365–2.058 µm
Temperature
296 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.365–2.058 µm
Refractive index n
1.62374
Extinction coefficient k
2.70488e-08
Permittivity ε1
2.63652
Permittivity ε2
8.78404e-08
Absorption coefficient α
0.00578465 cm⁻¹
Penetration depth δ = λ/(2πk)
3.45743e+09 nm
Abbe number Vd
47.009
Chromatic dispersion dn/dλ
-0.0678725 µm⁻¹
Group index ng
1.66362
Group velocity dispersion
125.461 fs²/mm
Dispersion parameter D
-684.457 ps/(nm·km)
Photon energy
2.11001 eV

ε = (n + ik)², α = 4πk/λ, ng = 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

# J-BAF8 (HIKARI): J-BAF8
hikari_j_baf8 = ls.fetch_refractiveindex("specs", "HIKARI-optical", "J-BAF8", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(hikari_j_baf8.range_nm)  # (365.015, 2058.09) nm
eps = hikari_j_baf8.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

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

Polynomial (formula 3), λ in µm
n2=2.58219095−0.00986301021⁢λ2.0−0.000116286506⁢λ4.0+0.0189733467⁢λ−2.0+0.000219248923⁢λ−4.0+4.98624477×10-5⁢λ−6.0−4.45223153×10-6⁢λ−8.0+3.07817299×10-7⁢λ−10.0

Valid from 0.365015 to 2.05809 µm.

Coefficients as stored
CiValue
C12.58219095
C2-0.00986301021
C32.0
C4-0.000116286506
C54.0
C60.0189733467
C7-2.0
C80.000219248923
C9-4.0
C104.98624477e-05
C11-6.0
C12-4.45223153e-06
C13-8.0
C143.07817299e-07
C15-10.0

Comments and conditions

Conditions

temperature
296 K

Properties

thermal dispersion
type: formula A, coefficients: 2.8794e-06 1.3033e-08 -1.4861e-13 6.4096e-07 7.6954e-10 0.22875
nd
1.623740
Vd
47.008663
glass status
preferred
density
value: 3140
thermal expansion
value: 6.7e-06, temperature range: 243 343
dPgF
-0.0005
resistance
phosphate: 2.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 296.0 K): dn/dT = 2.37e-06 K⁻¹ at 633 nm, dn/dT = 1.60e-06 K⁻¹ at 1310 nm, dn/dT = 1.54e-06 K⁻¹ at 1550 nm

References

Cite

NIKON Zemax catalog 2017-11 (obtained from http://www.nikon.com); See also HIKARI 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 421 wavelengths, the same grid as the API and the library
J-BAF8 (HIKARI), J-BAF8: n and k versus wavelength
λ (µm)nk
0.3650151.6582871.249871e-06
0.3666011.6577371.109326e-06
0.3681931.6571949.681706e-07
0.3697931.6566588.264021e-07
0.371.656598.080400e-07
0.3713991.656137.490625e-07
0.3730131.6556086.810590e-07
0.3746331.6550946.127601e-07
0.3762611.6545855.441645e-07
0.3778951.6540844.752709e-07
0.3795371.6535884.060780e-07
0.381.653453.865600e-07
0.3811861.6530993.662451e-07
0.3828421.6526163.378736e-07
0.3845051.6521393.093788e-07
0.3861751.6516682.807602e-07
0.3878531.6512032.520172e-07
0.3895381.6507432.231494e-07
0.391.6506182.152300e-07
0.391231.6502892.047392e-07
0.392931.6498411.902434e-07
0.3946371.6493981.756846e-07
0.3963511.648961.610625e-07
0.3980731.6485271.463769e-07
0.3998021.64811.316275e-07
0.41.6480511.299400e-07
0.4015391.6476771.251371e-07
0.4032831.647261.196931e-07
0.4050351.6468471.142256e-07
0.4067951.646441.087342e-07
0.4085621.6460371.032190e-07
0.4103371.6456389.767984e-08
0.412121.6452449.211661e-08
0.413911.6448558.652921e-08
0.4157081.644478.091755e-08
0.4175141.644097.528150e-08
0.4193281.6437136.962097e-08
0.421.6435756.752300e-08
0.4211491.6433416.647950e-08
0.4229791.6429736.481853e-08
0.4248171.642616.315033e-08
0.4266621.642256.147490e-08
0.4285161.6418945.979218e-08
0.4303771.6415425.810215e-08
0.4322471.6411945.640478e-08
0.4341251.640855.470004e-08
0.436011.6405095.298789e-08
0.4379051.6401735.126830e-08
0.4398071.639844.954124e-08
0.441.6398064.936600e-08
0.4417181.639514.860365e-08
0.4436371.6391844.775193e-08
0.4455641.6388614.689652e-08
0.4474991.6385424.603739e-08
0.4494431.6382264.517452e-08
0.4513961.6379144.430791e-08
0.4533571.6376054.343753e-08
0.4553261.6372994.256338e-08
0.4573041.6369964.168542e-08
0.4592911.6366974.080365e-08
0.461.6365914.048900e-08
0.4612861.63643.985817e-08
0.463291.6361073.887544e-08
0.4653031.6358163.788844e-08
0.4673241.6355293.689716e-08
0.4693541.6352453.590156e-08
0.4713931.6349633.490164e-08
0.4734411.6346843.389738e-08
0.4754981.6344093.288876e-08
0.4775641.6341363.187575e-08
0.4796381.6338653.085834e-08
0.481.6338193.068100e-08
0.4817221.6335983.010102e-08
0.4838151.6333332.939619e-08
0.4859171.6330712.868831e-08
0.4880271.6328112.797734e-08
0.4901481.6325542.726329e-08
0.4922771.63232.654614e-08
0.4944151.6320482.582587e-08
0.4965631.6317982.510247e-08
0.4987211.6315512.437593e-08
0.51.6314062.394500e-08
0.5008871.6313062.390941e-08
0.5030631.6310642.382211e-08
0.5052481.6308242.373443e-08
0.5074431.6305872.364637e-08
0.5096481.6303512.355793e-08
0.5118621.6301182.346910e-08
0.5140861.6298882.337989e-08
0.5163191.6296592.329029e-08
0.5185621.6294332.320030e-08
0.5208151.6292092.310992e-08
0.5230771.6289872.301915e-08
0.5253491.6287672.292798e-08
0.5276321.6285492.283641e-08
0.5299241.6283332.274445e-08
0.5322261.6281192.265209e-08
0.5345381.6279072.255933e-08
0.536861.6276982.246617e-08
0.5391931.627492.237260e-08
0.5415351.6272842.227862e-08
0.5438871.627082.218424e-08
0.546251.6268782.208944e-08
0.5486231.6266772.199423e-08
0.551.6265632.193900e-08
0.5510071.6264792.207580e-08
0.55341.6262822.240110e-08
0.5558041.6260882.272782e-08
0.5582191.6258952.305596e-08
0.5606441.6257032.338552e-08
0.563081.6255142.371651e-08
0.5655261.6253262.404895e-08
0.5679821.625142.438282e-08
0.570451.6249552.471815e-08
0.5729281.6247722.505493e-08
0.5754171.6245912.539318e-08
0.5779171.6244112.573289e-08
0.5804271.6242332.607408e-08
0.5829491.6240572.641676e-08
0.5854811.6238822.676092e-08
0.5880251.6237092.710658e-08
0.5905791.6235372.745374e-08
0.5931451.6233662.780240e-08
0.5957221.6231972.815258e-08
0.598311.623032.850429e-08
0.61.6229222.873400e-08
0.6009091.6228642.877754e-08
0.6035191.6226992.890258e-08
0.6061411.6225362.902816e-08
0.6087741.6223742.915430e-08
0.6114191.6222142.928097e-08
0.6140751.6220552.940820e-08
0.6167431.6218972.953599e-08
0.6194221.6217412.966432e-08
0.6221131.6215862.979322e-08
0.6248161.6214322.992267e-08
0.627531.621283.005269e-08
0.6302561.6211283.018327e-08
0.6329941.6209783.031442e-08
0.6357441.620833.044614e-08
0.6385061.6206823.057843e-08
0.641281.6205363.071130e-08
0.6440661.6203913.084474e-08
0.6468641.6202473.097876e-08
0.6496741.6201043.111337e-08
0.651.6200873.112900e-08
0.6524961.6199623.124851e-08
0.6553311.6198223.138423e-08
0.6581781.6196823.152054e-08
0.6610371.6195443.165744e-08
0.6639081.6194073.179494e-08
0.6667931.619273.193303e-08
0.6696891.6191353.207173e-08
0.6725991.6190013.221102e-08
0.6755211.6188683.235092e-08
0.6784551.6187363.249143e-08
0.6814031.6186053.263255e-08
0.6843631.6184753.277429e-08
0.6873361.6183473.291664e-08
0.6903221.6182193.305960e-08
0.6933211.6180923.320319e-08
0.6963331.6179653.334740e-08
0.6993581.617843.349224e-08
0.71.6178143.352300e-08
0.7023961.6177163.440687e-08
0.7054471.6175933.553262e-08
0.7085121.617473.666325e-08
0.711591.6173493.779879e-08
0.7146811.6172283.893927e-08
0.7177861.6171094.008471e-08
0.7209041.616994.123511e-08
0.7240361.6168724.239052e-08
0.7271811.6167554.355094e-08
0.730341.6166384.471641e-08
0.7335131.6165234.588694e-08
0.73671.6164084.706256e-08
0.73991.6162944.824328e-08
0.7431141.6161814.942913e-08
0.7463421.6160685.062013e-08
0.7495851.6159575.181631e-08
0.7528411.6158465.301768e-08
0.7561121.6157365.422427e-08
0.7593961.6156275.543611e-08
0.7626951.6155185.665321e-08
0.7660091.615415.787559e-08
0.7693361.6153035.910329e-08
0.7726791.6151966.033632e-08
0.7760351.615096.157470e-08
0.7794071.6149856.281847e-08
0.7827931.6148816.406764e-08
0.7861931.6147776.532223e-08
0.7896091.6146746.658228e-08
0.7930391.6145716.784780e-08
0.7964841.6144696.911882e-08
0.7999441.6143687.039536e-08
0.81.6143667.041600e-08
0.8034191.6142676.825335e-08
0.8069091.6141676.604576e-08
0.8104151.6140686.382857e-08
0.8139351.6139696.160176e-08
0.8174711.6138715.936527e-08
0.8210231.6137735.711907e-08
0.8245891.6136765.486311e-08
0.8281721.6135795.259735e-08
0.8317691.6134835.032174e-08
0.8353831.6133874.803625e-08
0.8390121.6132924.574083e-08
0.8426571.6131984.343544e-08
0.8463171.6131044.112004e-08
0.8499941.613013.879457e-08
0.8536871.6129183.645900e-08
0.8573951.6128253.411329e-08
0.861121.6127333.175739e-08
0.8648611.6126412.939125e-08
0.8686181.612552.701483e-08
0.8723911.612462.462809e-08
0.8761811.612372.223098e-08
0.8799881.612281.982346e-08
0.8838111.6121911.740547e-08
0.887651.6121021.497699e-08
0.8915061.6120131.253795e-08
0.8953791.6119251.008832e-08
0.8992691.6118387.628046e-09
0.91.6118217.165600e-09
0.9031751.611757.697287e-09
0.9070991.6116648.354232e-09
0.911041.6115779.014030e-09
0.9149981.6114919.676696e-09
0.9189721.6114051.034224e-08
0.9229651.611321.101068e-08
0.9269741.6112351.168201e-08
0.9310011.611151.235627e-08
0.9350461.6110661.303345e-08
0.9391081.6109821.371358e-08
0.9431881.6108981.439666e-08
0.9472851.6108151.508271e-08
0.95141.6107321.577174e-08
0.9555331.6106491.646376e-08
0.9596841.6105671.715879e-08
0.9638531.6104851.785684e-08
0.9680411.6104031.855792e-08
0.9722461.6103211.926205e-08
0.976471.610241.996923e-08
0.9807121.6101592.067949e-08
0.9849721.6100782.139283e-08
0.9892511.6099982.210927e-08
0.9935491.6099182.282883e-08
0.9978651.6098372.355151e-08
11.6097982.390900e-08
1.00221.6097582.375111e-08
1.006551.6096782.343862e-08
1.010931.6095992.312477e-08
1.015321.609522.280956e-08
1.019731.6094412.249298e-08
1.024161.6093622.217502e-08
1.028611.6092832.185568e-08
1.033081.6092052.153496e-08
1.037561.6091272.121284e-08
1.042071.6090492.088932e-08
1.04661.6089712.056440e-08
1.051151.6088932.023806e-08
1.055711.6088161.991031e-08
1.06031.6087381.958113e-08
1.06491.6086611.925052e-08
1.069531.6085841.891848e-08
1.074181.6085071.858500e-08
1.078841.608431.825006e-08
1.083531.6083531.791367e-08
1.088241.6082761.757582e-08
1.092961.60821.723651e-08
1.097711.6081231.689571e-08
1.102481.6080471.655344e-08
1.107271.6079711.620968e-08
1.112081.6078951.586443e-08
1.116911.6078181.551768e-08
1.121761.6077421.516942e-08
1.126641.6076661.481964e-08
1.131531.607591.446835e-08
1.136451.6075141.411554e-08
1.141381.6074391.376119e-08
1.146341.6073631.340530e-08
1.151321.6072871.304786e-08
1.156321.6072111.268887e-08
1.161351.6071351.232832e-08
1.166391.607061.196621e-08
1.171461.6069841.160252e-08
1.176551.6069081.123725e-08
1.181661.6068321.087040e-08
1.186791.6067571.050195e-08
1.191951.6066811.013190e-08
1.197131.6066059.760247e-09
1.21.6065639.554100e-09
1.202331.6065291.074646e-08
1.207551.6064531.342115e-08
1.21281.6063771.610746e-08
1.218071.6063011.880544e-08
1.223361.6062252.151514e-08
1.228671.6061492.423662e-08
1.234011.6060732.696991e-08
1.239371.6059962.971508e-08
1.244751.605923.247218e-08
1.250161.6058443.524125e-08
1.255591.6057673.802235e-08
1.261051.605694.081554e-08
1.266531.6056144.362086e-08
1.272031.6055374.643836e-08
1.277551.605464.926811e-08
1.28311.6053835.211015e-08
1.288681.6053055.496453e-08
1.294281.6052285.783132e-08
1.29991.6051516.071056e-08
1.305551.6050736.360231e-08
1.311221.6049956.650662e-08
1.316911.6049176.942354e-08
1.322641.6048397.235314e-08
1.328381.604767.529547e-08
1.334151.6046827.825057e-08
1.339951.6046038.121852e-08
1.345771.6045248.419936e-08
1.351621.6044458.719315e-08
1.357491.6043669.019994e-08
1.363381.6042869.321980e-08
1.369311.6042069.625277e-08
1.375261.6041269.929892e-08
1.381231.6040461.023583e-07
1.387231.6039651.054310e-07
1.393261.6038851.085170e-07
1.399311.6038041.116164e-07
1.41.6037941.119700e-07
1.405391.6037221.124008e-07
1.411491.6036411.128889e-07
1.417631.6035591.133792e-07
1.423781.6034771.138715e-07
1.429971.6033941.143661e-07
1.436181.6033121.148627e-07
1.442421.6032291.153615e-07
1.448691.6031451.158625e-07
1.454981.6030621.163657e-07
1.46131.6029781.168710e-07
1.467651.6028931.173786e-07
1.474031.6028091.178883e-07
1.480431.6027241.184003e-07
1.486861.6026381.189145e-07
1.493321.6025531.194309e-07
1.499811.6024661.199495e-07
1.506321.602381.204704e-07
1.512871.6022931.209936e-07
1.519441.6022061.215191e-07
1.526041.6021181.220468e-07
1.532671.602031.225768e-07
1.539331.6019421.231092e-07
1.546011.6018531.236438e-07
1.552731.6017631.241808e-07
1.559481.6016741.247201e-07
1.566251.6015841.252617e-07
1.573051.6014931.258057e-07
1.579891.6014021.263521e-07
1.586751.601311.269008e-07
1.593641.6012181.274519e-07
1.61.6011331.279600e-07
1.600571.6011261.284599e-07
1.607521.6010331.345805e-07
1.61451.6009391.407277e-07
1.621521.6008451.469016e-07
1.628561.600751.531023e-07
1.635641.6006551.593299e-07
1.642741.600561.655846e-07
1.649881.6004631.718665e-07
1.657051.6003671.781756e-07
1.664251.6002691.845122e-07
1.671481.6001721.908763e-07
1.678741.6000731.972680e-07
1.686031.5999742.036876e-07
1.693351.5998752.101350e-07
1.700711.5997742.166104e-07
1.70811.5996742.231139e-07
1.715521.5995722.296457e-07
1.722971.599472.362059e-07
1.730461.5993672.427945e-07
1.737971.5992642.494118e-07
1.745521.599162.560578e-07
1.753111.5990552.627327e-07
1.760721.598952.694366e-07
1.768371.5988442.761697e-07
1.776051.5987372.829320e-07
1.783771.598632.897236e-07
1.791521.5985222.965448e-07
1.79931.5984133.033956e-07
1.81.5984033.040100e-07
1.807121.5983033.127847e-07
1.814971.5981933.224617e-07
1.822851.5980823.321807e-07
1.830771.597973.419419e-07
1.838731.5978573.517455e-07
1.846711.5977443.615918e-07
1.854741.597633.714808e-07
1.862791.5975153.814128e-07
1.870891.5973993.913879e-07
1.879011.5972824.014063e-07
1.887181.5971654.114683e-07
1.895371.5970464.215740e-07
1.903611.5969274.317235e-07
1.911881.5968074.419172e-07
1.920181.5966864.521552e-07
1.928531.5965644.624376e-07
1.93691.5964424.727647e-07
1.945321.5963184.831367e-07
1.953771.5961944.935537e-07
1.962261.5960685.040160e-07
1.970781.5959425.145237e-07
1.979341.5958145.250771e-07
1.987941.5956865.356763e-07
1.996581.5955565.463216e-07
21.5955055.505400e-07
2.005251.5954265.840058e-07
2.013961.5952956.395211e-07
2.022711.5951626.952775e-07
2.03151.5950297.512762e-07
2.040321.5948948.075181e-07
2.049191.5947598.640043e-07
2.058091.5946229.207360e-07

Optical transmission calculator

Free-standing sample in vacuum, normal incidence
Method
Transmittance T
—
Reflectance R
—

Fresnel reflection calculator

Direction
Rp
—
Rs
—
R = (Rp+Rs)/2
—
Phase φp
—
Phase φs
—
Brewster angle θB
—
Critical angle θC
—