Optical constants

Refractive index of J-KF6 (HIKARI)

J-KF6: 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
1.51742
Extinction coefficient k
1.29605e-08
Permittivity ε1
2.30256
Permittivity ε2
3.93330e-08
Absorption coefficient α
0.00277172 cm⁻¹
Penetration depth δ = λ/(2πk)
7.21573e+09 nm
Abbe number Vd
52.204
Chromatic dispersion dn/dλ
-0.0509047 µm⁻¹
Group index ng
1.54733
Group velocity dispersion
91.0707 fs²/mm
Dispersion parameter D
-496.839 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-KF6 (HIKARI): J-KF6
hikari_j_kf6 = ls.fetch_refractiveindex("specs", "HIKARI-optical", "J-KF6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(hikari_j_kf6.range_nm)  # (365.015, 2058.09) nm
eps = hikari_j_kf6.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=2.26653222−0.00974283829⁢λ2.0−8.49115572×10-5⁢λ4.0+0.0127195343⁢λ−2.0+0.000315395806⁢λ−4.0−8.83703038×10-6⁢λ−6.0+1.84064027×10-6⁢λ−8.0

Valid from 0.365015 to 2.05809 µm.

Coefficients as stored
CiValue
C12.26653222
C2-0.00974283829
C32.0
C4-8.49115572e-05
C54.0
C60.0127195343
C7-2.0
C80.000315395806
C9-4.0
C10-8.83703038e-06
C11-6.0
C121.84064027e-06
C13-8.0

Comments and conditions

Conditions

temperature
296 K

Properties

thermal dispersion
type: formula A, coefficients: 1.0458e-06 1.7479e-08 -2.0062e-12 4.8402e-07 3.8942e-10 0.23771
nd
1.517420
Vd
52.203782
density
value: 2470
thermal expansion
value: 6.8e-06, temperature range: 243 343
dPgF
0.0011
resistance
phosphate: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 296.0 K): dn/dT = 1.05e-06 K⁻¹ at 633 nm, dn/dT = 5.60e-07 K⁻¹ at 1310 nm, dn/dT = 5.21e-07 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-KF6 (HIKARI), J-KF6: n and k versus wavelength
λ (µm)nk
0.3650151.542913.709130e-07
0.3666011.5425073.300049e-07
0.3681931.5421092.889190e-07
0.3697931.5417162.476546e-07
0.371.5416662.423100e-07
0.3713991.5413282.305531e-07
0.3730131.5409462.169970e-07
0.3746331.5405682.033819e-07
0.3762611.5401951.897077e-07
0.3778951.5398271.759741e-07
0.3795371.5394631.621808e-07
0.381.5393611.582900e-07
0.3811861.5391041.514899e-07
0.3828421.5387491.419930e-07
0.3845051.5383991.324548e-07
0.3861751.5380531.228752e-07
0.3878531.5377111.132539e-07
0.3895381.5373731.035909e-07
0.391.5372821.009400e-07
0.391231.537049.843681e-08
0.392931.536719.497796e-08
0.3946371.5363859.150409e-08
0.3963511.5360638.801513e-08
0.3980731.5357458.451101e-08
0.3998021.5354318.099166e-08
0.41.5353968.058900e-08
0.4015391.5351217.879748e-08
0.4032831.5348147.676685e-08
0.4050351.5345117.472739e-08
0.4067951.5342117.267908e-08
0.4085621.5339157.062187e-08
0.4103371.5336226.855572e-08
0.412121.5333326.648060e-08
0.413911.5330466.439646e-08
0.4157081.5327636.230326e-08
0.4175141.5324836.020098e-08
0.4193281.5322065.808956e-08
0.421.5321045.730700e-08
0.4211491.5319325.664666e-08
0.4229791.5316625.559557e-08
0.4248171.5313945.453992e-08
0.4266621.5311295.347968e-08
0.4285161.5308675.241483e-08
0.4303771.5306085.134536e-08
0.4322471.5303525.027124e-08
0.4341251.5300994.919245e-08
0.436011.5298484.810898e-08
0.4379051.52964.702080e-08
0.4398071.5293554.592790e-08
0.441.529334.581700e-08
0.4417181.5291124.472435e-08
0.4436371.5288724.350363e-08
0.4455641.5286344.227760e-08
0.4474991.5283994.104625e-08
0.4494431.5281663.980955e-08
0.4513961.5279363.856747e-08
0.4533571.5277083.732000e-08
0.4553261.5274823.606711e-08
0.4573041.5272593.480878e-08
0.4592911.5270383.354498e-08
0.461.526963.309400e-08
0.4612861.526823.244394e-08
0.463291.5266033.143125e-08
0.4653031.5263893.041417e-08
0.4673241.5261772.939266e-08
0.4693541.5259672.836671e-08
0.4713931.5257592.733631e-08
0.4734411.5255532.630143e-08
0.4754981.525352.526206e-08
0.4775641.5251482.421817e-08
0.4796381.5249482.316975e-08
0.481.5249142.298700e-08
0.4817221.524752.272499e-08
0.4838151.5245552.240659e-08
0.4859171.5243612.208680e-08
0.4880271.5241692.176562e-08
0.4901481.5239782.144304e-08
0.4922771.523792.111907e-08
0.4944151.5236042.079369e-08
0.4965631.5234192.046689e-08
0.4987211.5232362.013867e-08
0.51.5231291.994400e-08
0.5008871.5230551.974562e-08
0.5030631.5228751.925900e-08
0.5052481.5226981.877026e-08
0.5074431.5225221.827941e-08
0.5096481.5223471.778641e-08
0.5118621.5221741.729128e-08
0.5140861.5220031.679400e-08
0.5163191.5218341.629456e-08
0.5185621.5216661.579294e-08
0.5208151.5214991.528915e-08
0.5230771.5213341.478317e-08
0.5253491.5211711.427499e-08
0.5276321.5210091.376460e-08
0.5299241.5208491.325200e-08
0.5322261.520691.273717e-08
0.5345381.5205321.222010e-08
0.536861.5203761.170079e-08
0.5391931.5202211.117922e-08
0.5415351.5200681.065538e-08
0.5438871.5199161.012927e-08
0.546251.5197659.600875e-09
0.5486231.5196169.070182e-09
0.551.519538.762300e-09
0.5510071.5194688.874693e-09
0.55341.5193219.141960e-09
0.5558041.5191769.410387e-09
0.5582191.5190329.679981e-09
0.5606441.5188899.950746e-09
0.563081.5187481.022269e-08
0.5655261.5186071.049581e-08
0.5679821.5184681.077012e-08
0.570451.518331.104562e-08
0.5729281.5181931.132232e-08
0.5754171.5180581.160022e-08
0.5779171.5179231.187932e-08
0.5804271.517791.215964e-08
0.5829491.5176581.244118e-08
0.5854811.5175261.272394e-08
0.5880251.5173961.300793e-08
0.5905791.5172681.329315e-08
0.5931451.517141.357961e-08
0.5957221.5170131.386732e-08
0.598311.5168871.415627e-08
0.61.5168061.434500e-08
0.6009091.5167621.436674e-08
0.6035191.5166391.442918e-08
0.6061411.5165161.449190e-08
0.6087741.5163941.455488e-08
0.6114191.5162731.461814e-08
0.6140751.5161531.468168e-08
0.6167431.5160351.474549e-08
0.6194221.5159171.480958e-08
0.6221131.51581.487395e-08
0.6248161.5156841.493859e-08
0.627531.5155691.500352e-08
0.6302561.5154541.506873e-08
0.6329941.5153411.513422e-08
0.6357441.5152281.520000e-08
0.6385061.5151171.526606e-08
0.641281.5150061.533241e-08
0.6440661.5148961.539905e-08
0.6468641.5147871.546598e-08
0.6496741.5146791.553319e-08
0.651.5146661.554100e-08
0.6524961.5145711.560065e-08
0.6553311.5144641.566840e-08
0.6581781.5143591.573644e-08
0.6610371.5142531.580478e-08
0.6639081.5141491.587341e-08
0.6667931.5140461.594234e-08
0.6696891.5139431.601158e-08
0.6725991.5138411.608111e-08
0.6755211.5137391.615094e-08
0.6784551.5136391.622108e-08
0.6814031.5135391.629152e-08
0.6843631.5134391.636227e-08
0.6873361.5133411.643332e-08
0.6903221.5132431.650469e-08
0.6933211.5131461.657636e-08
0.6963331.5130491.664835e-08
0.6993581.5129531.672065e-08
0.71.5129331.673600e-08
0.7023961.5128581.725291e-08
0.7054471.5127631.791128e-08
0.7085121.512671.857250e-08
0.711591.5125761.923660e-08
0.7146811.5124831.990358e-08
0.7177861.5123912.057346e-08
0.7209041.51232.124625e-08
0.7240361.5122092.192196e-08
0.7271811.5121182.260061e-08
0.730341.5120292.328220e-08
0.7335131.5119392.396676e-08
0.73671.5118512.465429e-08
0.73991.5117632.534481e-08
0.7431141.5116752.603832e-08
0.7463421.5115882.673485e-08
0.7495851.5115012.743441e-08
0.7528411.5114152.813700e-08
0.7561121.511332.884265e-08
0.7593961.5112452.955136e-08
0.7626951.511163.026315e-08
0.7660091.5110763.097804e-08
0.7693361.5109933.169603e-08
0.7726791.510913.241714e-08
0.7760351.5108273.314138e-08
0.7794071.5107453.386876e-08
0.7827931.5106633.459931e-08
0.7861931.5105823.533303e-08
0.7896091.5105013.606994e-08
0.7930391.510423.681005e-08
0.7964841.510343.755337e-08
0.7999441.5102613.829993e-08
0.81.5102593.831200e-08
0.8034191.5101823.724704e-08
0.8069091.5101033.615996e-08
0.8104151.5100243.506815e-08
0.8139351.5099463.397160e-08
0.8174711.5098693.287029e-08
0.8210231.5097913.176419e-08
0.8245891.5097143.065329e-08
0.8281721.5096382.953756e-08
0.8317691.5095622.841698e-08
0.8353831.5094862.729154e-08
0.8390121.509412.616121e-08
0.8426571.5093352.502596e-08
0.8463171.509262.388579e-08
0.8499941.5091862.274066e-08
0.8536871.5091112.159055e-08
0.8573951.5090382.043545e-08
0.861121.5089641.927534e-08
0.8648611.5088911.811018e-08
0.8686181.5088181.693996e-08
0.8723911.5087451.576466e-08
0.8761811.5086721.458425e-08
0.8799881.50861.339871e-08
0.8838111.5085281.220802e-08
0.887651.5084561.101216e-08
0.8915061.5083859.811108e-09
0.8953791.5083148.604835e-09
0.8992691.5082437.393322e-09
0.91.508237.165600e-09
0.9031751.5081727.190880e-09
0.9070991.5081027.222116e-09
0.911041.5080317.253487e-09
0.9149981.5079617.284995e-09
0.9189721.5078917.316640e-09
0.9229651.5078227.348422e-09
0.9269741.5077527.380342e-09
0.9310011.5076837.412401e-09
0.9350461.5076147.444599e-09
0.9391081.5075457.476937e-09
0.9431881.5074767.509416e-09
0.9472851.5074087.542036e-09
0.95141.5073397.574797e-09
0.9555331.5072717.607701e-09
0.9596841.5072037.640747e-09
0.9638531.5071357.673937e-09
0.9680411.5070677.707272e-09
0.9722461.5077.740751e-09
0.976471.5069327.774375e-09
0.9807121.5068657.808146e-09
0.9849721.5067977.842063e-09
0.9892511.506737.876128e-09
0.9935491.5066637.910341e-09
0.9978651.5065967.944702e-09
11.5065637.961700e-09
1.00221.5065297.979215e-09
1.006551.5064628.013880e-09
1.010931.5063968.048695e-09
1.015321.5063298.083662e-09
1.019731.5062638.118781e-09
1.024161.5061968.154052e-09
1.028611.506138.189476e-09
1.033081.5060638.225055e-09
1.037561.5059978.260787e-09
1.042071.5059318.296676e-09
1.04661.5058648.332720e-09
1.051151.5057988.368920e-09
1.055711.5057328.405278e-09
1.06031.5056668.441794e-09
1.06491.50568.478468e-09
1.069531.5055348.515302e-09
1.074181.5054688.552296e-09
1.078841.5054028.589450e-09
1.083531.5053368.626766e-09
1.088241.5052698.664244e-09
1.092961.5052038.701885e-09
1.097711.5051378.739689e-09
1.102481.5050718.777658e-09
1.107271.5050058.815791e-09
1.112081.5049398.854090e-09
1.116911.5048728.892556e-09
1.121761.5048068.931189e-09
1.126641.504748.969989e-09
1.131531.5046739.008958e-09
1.136451.5046079.048097e-09
1.141381.504549.087405e-09
1.146341.5044749.126884e-09
1.151321.5044079.166535e-09
1.156321.504349.206357e-09
1.161351.5042739.246353e-09
1.166391.5042069.286523e-09
1.171461.5041399.326867e-09
1.176551.5040729.367386e-09
1.181661.5040059.408082e-09
1.186791.5039389.448954e-09
1.191951.503879.490004e-09
1.197131.5038029.531232e-09
1.21.5037659.554100e-09
1.202331.5037351.087755e-08
1.207551.5036671.384631e-08
1.21281.5035991.682796e-08
1.218071.503531.982257e-08
1.223361.5034622.283019e-08
1.228671.5033942.585087e-08
1.234011.5033252.888467e-08
1.239371.5032563.193166e-08
1.244751.5031873.499188e-08
1.250161.5031183.806540e-08
1.255591.5030484.115226e-08
1.261051.5029794.425254e-08
1.266531.5029094.736629e-08
1.272031.5028395.049356e-08
1.277551.5027695.363442e-08
1.28311.5026985.678892e-08
1.288681.5026285.995713e-08
1.294281.5025576.313910e-08
1.29991.5024866.633490e-08
1.305551.5024146.954457e-08
1.311221.5023437.276820e-08
1.316911.5022717.600582e-08
1.322641.5021997.925751e-08
1.328381.5021268.252333e-08
1.334151.5020548.580333e-08
1.339951.5019818.909758e-08
1.345771.5019089.240615e-08
1.351621.5018349.572908e-08
1.357491.501769.906646e-08
1.363381.5016861.024183e-07
1.369311.5016121.057848e-07
1.375261.5015371.091658e-07
1.381231.5014621.125616e-07
1.387231.5013871.159721e-07
1.393261.5013111.193974e-07
1.399311.5012351.228376e-07
1.41.5012261.232300e-07
1.405391.5011591.219743e-07
1.411491.5010821.205516e-07
1.417631.5010051.191227e-07
1.423781.5009271.176876e-07
1.429971.500851.162462e-07
1.436181.5007721.147986e-07
1.442421.5006931.133447e-07
1.448691.5006141.118845e-07
1.454981.5005351.104179e-07
1.46131.5004551.089450e-07
1.467651.5003751.074657e-07
1.474031.5002941.059799e-07
1.480431.5002131.044877e-07
1.486861.5001321.029890e-07
1.493321.500051.014838e-07
1.499811.4999689.997208e-08
1.506321.4998859.845377e-08
1.512871.4998029.692886e-08
1.519441.4997189.539733e-08
1.526041.4996349.385915e-08
1.532671.4995499.231428e-08
1.539331.4994649.076271e-08
1.546011.4993798.920439e-08
1.552731.4992938.763930e-08
1.559481.4992068.606742e-08
1.566251.4991198.448870e-08
1.573051.4990318.290313e-08
1.579891.4989438.131067e-08
1.586751.4988547.971129e-08
1.593641.4987657.810496e-08
1.61.4986837.662400e-08
1.600571.4986757.681521e-08
1.607521.4985857.915622e-08
1.61451.4984948.150741e-08
1.621521.4984038.386881e-08
1.628561.4983118.624047e-08
1.635641.4982188.862244e-08
1.642741.4981259.101475e-08
1.649881.4980319.341745e-08
1.657051.4979379.583059e-08
1.664251.4978419.825422e-08
1.671481.4977461.006884e-07
1.678741.4976491.031331e-07
1.686031.4975521.055884e-07
1.693351.4974551.080545e-07
1.700711.4973561.105312e-07
1.70811.4972571.130187e-07
1.715521.4971581.155170e-07
1.722971.4970571.180261e-07
1.730461.4969561.205462e-07
1.737971.4968551.230772e-07
1.745521.4967521.256191e-07
1.753111.4966491.281722e-07
1.760721.4965451.307363e-07
1.768371.496441.333116e-07
1.776051.4963351.358980e-07
1.783771.4962291.384957e-07
1.791521.4961221.411047e-07
1.79931.4960141.437250e-07
1.81.4960051.439600e-07
1.807121.4959061.473975e-07
1.814971.4957961.511886e-07
1.822851.4956861.549961e-07
1.830771.4955751.588201e-07
1.838731.4954641.626608e-07
1.846711.4953511.665181e-07
1.854741.4952381.703922e-07
1.862791.4951231.742831e-07
1.870891.4950081.781909e-07
1.879011.4948921.821157e-07
1.887181.4947751.860576e-07
1.895371.4946571.900166e-07
1.903611.4945391.939927e-07
1.911881.4944191.979862e-07
1.920181.4942982.019970e-07
1.928531.4941772.060252e-07
1.93691.4940542.100709e-07
1.945321.4939312.141342e-07
1.953771.4938072.182152e-07
1.962261.4936812.223139e-07
1.970781.4935552.264303e-07
1.979341.4934272.305647e-07
1.987941.4932992.347170e-07
1.996581.493172.388874e-07
21.4931182.405400e-07
2.005251.4930392.720523e-07
2.013961.4929083.243270e-07
2.022711.4927753.768287e-07
2.03151.4926414.295586e-07
2.040321.4925064.825175e-07
2.049191.4923715.357064e-07
2.058091.4922345.891265e-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
—