Optical constants

Refractive index of N-BASF2 (SCHOTT)

N-BASF2: n,k 0.37–2.5 µm

Data
formula 2 + tabulated k
Range
0.37–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.37–2.5 µm
Refractive index n
1.66446
Extinction coefficient k
2.52351e-08
Permittivity ε1
2.77042
Permittivity ε2
8.40055e-08
Absorption coefficient α
0.00539676 cm⁻¹
Penetration depth δ = λ/(2πk)
3.70593e+09 nm
Abbe number Vd
36.001
Chromatic dispersion dn/dλ
-0.0934035 µm⁻¹
Group index ng
1.71934
Group velocity dispersion
182.731 fs²/mm
Dispersion parameter D
-996.895 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

# N-BASF2 (SCHOTT): N-BASF2
schott_n_basf2 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-BASF2", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_basf2.range_nm)  # (370, 2500) nm
eps = schott_n_basf2.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

Sellmeier (C in µm²) (formula 2), λ in µm
n2−1=1.53652081λ2λ2−0.0108435729+0.156971102λ2λ2−0.0562278762+1.30196815λ2λ2−131.3397

Valid from 0.37 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.53652081
C30.0108435729
C40.156971102
C50.0562278762
C61.30196815
C7131.3397

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.89e-06 1.22e-08 -1.61e-11 7.77e-07 9.96e-10 0.256
nd
1.66446
Vd
36
glass code
664360.315
glass status
standard
density
value: 3151
thermal expansion
value: 7.12e-06, temperature range: 243 343; value: 8.13e-06, temperature range: 293 573
dPgF
0.0057
resistance
acid: 1.0; stain: 0.0; alkali: 1.0; climatic: 1.0; phosphate: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 2.23e-06 K⁻¹ at 633 nm, dn/dT = 1.22e-06 K⁻¹ at 1310 nm, dn/dT = 1.14e-06 K⁻¹ at 1550 nm

References

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 417 wavelengths, the same grid as the API and the library
N-BASF2 (SCHOTT), N-BASF2: n and k versus wavelength
λ (µm)nk
0.371.7128093.313500e-06
0.3717761.7118932.969804e-06
0.373561.7109922.624459e-06
0.3753531.7101062.277456e-06
0.3771551.7092351.928787e-06
0.3789651.7083781.578445e-06
0.381.7078971.378200e-06
0.3807841.7075361.323147e-06
0.3826121.7067071.194849e-06
0.3844481.7058911.065934e-06
0.3862941.7050889.364011e-07
0.3881481.7042988.062463e-07
0.391.7035246.762300e-07
0.3900111.703526.758930e-07
0.3918831.7027546.178729e-07
0.3937641.7025.595743e-07
0.3956541.7012585.009959e-07
0.3975531.7005274.421364e-07
0.3994611.6998073.829943e-07
0.41.6996063.662900e-07
0.4013781.6990983.446163e-07
0.4033051.6983993.143233e-07
0.4051.6977962.876700e-07
0.4052411.6977112.855537e-07
0.4071861.6970332.684525e-07
0.409141.6963642.512693e-07
0.4111041.6957062.340036e-07
0.4130771.6950572.166551e-07
0.415061.6944171.992232e-07
0.4170521.6937861.817077e-07
0.4190541.6931651.641081e-07
0.421.6928751.557900e-07
0.4210651.6925521.521235e-07
0.4230861.6919471.451673e-07
0.4251171.6913511.381778e-07
0.4271581.6907641.311547e-07
0.4292081.6901841.240979e-07
0.4312681.6896121.170072e-07
0.4333381.6890481.098825e-07
0.4354181.6884921.027237e-07
0.4361.6883381.007200e-07
0.4375081.6879439.901394e-08
0.4396081.6874029.663784e-08
0.4417181.6868679.425034e-08
0.4438381.686349.185138e-08
0.4459681.685828.944090e-08
0.4481091.6853078.701885e-08
0.450261.68488.458518e-08
0.4524211.68438.213983e-08
0.4545921.6838067.968274e-08
0.4567741.6833197.721385e-08
0.4589671.6828387.473312e-08
0.461.6826147.356400e-08
0.461171.6823637.278243e-08
0.4633831.6818947.130341e-08
0.4656071.6814316.981728e-08
0.4678421.6809746.832403e-08
0.4700881.6805236.682360e-08
0.4723441.6800776.531598e-08
0.4746111.6796376.380112e-08
0.4768891.6792026.227899e-08
0.4791781.6787726.074955e-08
0.4814781.6783485.921277e-08
0.4837891.6779295.766861e-08
0.4861111.6775155.611705e-08
0.4884451.6771065.455803e-08
0.4907891.6767035.299153e-08
0.4931451.6763035.141752e-08
0.4955121.6759094.983595e-08
0.497891.6755194.824678e-08
0.51.6751794.683700e-08
0.500281.6751344.671185e-08
0.5026811.6747544.563807e-08
0.5050941.6743784.455914e-08
0.5075181.6740064.347503e-08
0.5099541.6736394.238572e-08
0.5124021.6732764.129118e-08
0.5148611.6729184.019139e-08
0.5173331.6725633.908631e-08
0.5198161.6722123.797594e-08
0.5223111.6718663.686023e-08
0.5248181.6715233.573917e-08
0.5273371.6711853.461273e-08
0.5298681.670853.348088e-08
0.5324111.6705193.234360e-08
0.5349671.6701923.120086e-08
0.5375341.6698683.005263e-08
0.5401141.6695482.889889e-08
0.5427071.6692322.773962e-08
0.5453121.6689192.657478e-08
0.5461.6688372.626700e-08
0.5479291.6686092.614734e-08
0.5505591.6683032.598420e-08
0.5532021.6680012.582029e-08
0.5558571.6677012.565558e-08
0.5585251.6674052.549009e-08
0.5612061.6671132.532380e-08
0.5638991.6668232.515671e-08
0.5666061.6665362.498882e-08
0.5693261.6662532.482012e-08
0.5720581.6659722.465062e-08
0.5748041.6656952.448030e-08
0.5775631.665422.430917e-08
0.581.6651812.415800e-08
0.5803351.6651492.420551e-08
0.5831211.664882.460028e-08
0.585921.6646142.499695e-08
0.5887321.6643512.539552e-08
0.5915581.6640912.579601e-08
0.5943971.6638332.619842e-08
0.597251.6635782.660276e-08
0.6001171.6633262.700904e-08
0.6029971.6630762.741727e-08
0.6058911.6628292.782746e-08
0.60881.6625852.823962e-08
0.6117221.6623432.865376e-08
0.6146581.6621032.906989e-08
0.6176081.6618662.948801e-08
0.621.6616762.982700e-08
0.6205731.6616312.985454e-08
0.6235511.6613982.999781e-08
0.6265441.6611683.014177e-08
0.6295511.6609413.028642e-08
0.6325731.6607153.043177e-08
0.6356091.6604923.057781e-08
0.638661.6602713.072455e-08
0.6417261.6600523.087200e-08
0.6448061.6598353.102016e-08
0.6479011.659623.116902e-08
0.651011.6594083.131860e-08
0.6541351.6591973.146890e-08
0.6572751.6589883.161992e-08
0.661.658813.175100e-08
0.660431.6587823.165047e-08
0.66361.6585773.090895e-08
0.6667851.6583753.016386e-08
0.6699851.6581742.941520e-08
0.6732011.6579752.866294e-08
0.6764321.6577792.790707e-08
0.6796791.6575842.714758e-08
0.6829411.657392.638444e-08
0.6862191.6571992.561763e-08
0.6895131.6570092.484715e-08
0.6928231.6568212.407297e-08
0.6961481.6566352.329507e-08
0.6994891.6564512.251344e-08
0.71.6564232.239400e-08
0.7028471.6562682.229707e-08
0.706221.6560872.218221e-08
0.709611.6559072.206680e-08
0.7130161.6557292.195084e-08
0.7164381.6555532.183432e-08
0.7198771.6553782.171724e-08
0.7233321.6552052.159959e-08
0.7268041.6550332.148139e-08
0.7302931.6548632.136261e-08
0.7337981.6546942.124327e-08
0.737321.6545272.112335e-08
0.7408591.6543612.100286e-08
0.7444151.6541972.088179e-08
0.7479881.6540342.076013e-08
0.7515781.6538722.063790e-08
0.7551861.6537122.051507e-08
0.7588111.6535532.039166e-08
0.7624531.6533962.026766e-08
0.7661121.6532392.014306e-08
0.769791.6530842.001786e-08
0.7734841.6529311.989206e-08
0.7771971.6527781.976566e-08
0.7809271.6526271.963865e-08
0.7846761.6524771.951103e-08
0.7884421.6523281.938279e-08
0.7922261.6521811.925395e-08
0.7960291.6520341.912448e-08
0.799851.6518891.899439e-08
0.8036891.6517451.886368e-08
0.8075461.6516021.873234e-08
0.8114221.651461.860037e-08
0.8153171.6513191.846777e-08
0.8192311.6511791.833453e-08
0.8231631.651041.820065e-08
0.8271141.6509021.806613e-08
0.8310841.6507661.793096e-08
0.8350731.650631.779515e-08
0.8390811.6504951.765868e-08
0.8431081.6503611.752156e-08
0.8471551.6502291.738378e-08
0.8512211.6500971.724533e-08
0.8553071.6499661.710623e-08
0.8594121.6498361.696645e-08
0.8635371.6497071.682601e-08
0.8676821.6495781.668489e-08
0.8718471.6494511.654309e-08
0.8760321.6493251.640061e-08
0.8802361.6491991.625745e-08
0.8844611.6490741.611361e-08
0.8887071.648951.596907e-08
0.8929721.6488271.582383e-08
0.8972581.6487041.567790e-08
0.9015651.6485831.553127e-08
0.9058921.6484621.538394e-08
0.910241.6483421.523590e-08
0.9146091.6482221.508715e-08
0.9189991.6481041.493768e-08
0.923411.6479861.478750e-08
0.9278431.6478691.463659e-08
0.9322961.6477521.448497e-08
0.9367711.6476361.433261e-08
0.9412671.6475211.417952e-08
0.9457851.6474061.402570e-08
0.9503251.6472921.387114e-08
0.9548861.6471791.371584e-08
0.9594691.6470661.355979e-08
0.9640751.6469541.340299e-08
0.9687021.6468431.324544e-08
0.9733521.6467321.308714e-08
0.9780231.6466211.292807e-08
0.9827181.6465121.276824e-08
0.9874351.6464021.260765e-08
0.9921741.6462941.244628e-08
0.9969361.6461851.228414e-08
1.001721.6460781.212122e-08
1.006531.645971.195752e-08
1.011361.6458641.179303e-08
1.016221.6457571.162776e-08
1.021091.6456521.146169e-08
1.025991.6455461.129482e-08
1.030921.6454411.112715e-08
1.035871.6453371.095868e-08
1.040841.6452331.078940e-08
1.045831.6451291.061930e-08
1.050851.6450261.044839e-08
1.05591.6449231.027666e-08
1.061.644841.013700e-08
1.060971.6448211.026747e-08
1.066061.6447191.095515e-08
1.071181.6446171.164614e-08
1.076321.6445161.234044e-08
1.081481.6444151.303808e-08
1.086671.6443141.373906e-08
1.091891.6442131.444341e-08
1.097131.6441131.515114e-08
1.10241.6440141.586226e-08
1.107691.6439141.657680e-08
1.1131.6438151.729477e-08
1.118351.6437161.801618e-08
1.123711.6436171.874106e-08
1.129111.6435191.946942e-08
1.134531.643422.020127e-08
1.139971.6433222.093664e-08
1.145451.6432252.167553e-08
1.150941.6431272.241797e-08
1.156471.643032.316398e-08
1.162021.6429322.391356e-08
1.16761.6428352.466675e-08
1.17321.6427392.542354e-08
1.178831.6426422.618398e-08
1.184491.6425452.694806e-08
1.190171.6424492.771580e-08
1.195891.6423532.848724e-08
1.201631.6422562.926237e-08
1.207391.642163.004123e-08
1.213191.6420643.082383e-08
1.219011.6419693.161018e-08
1.224861.6418733.240030e-08
1.230741.6417773.319422e-08
1.236651.6416813.399195e-08
1.242591.6415863.479351e-08
1.248551.641493.559891e-08
1.254541.6413953.640818e-08
1.260561.6412993.722134e-08
1.266621.6412043.803840e-08
1.272691.6411083.885938e-08
1.27881.6410133.968430e-08
1.284941.6409174.051318e-08
1.291111.6408214.134604e-08
1.297311.6407264.218289e-08
1.303531.640634.302377e-08
1.309791.6405354.386867e-08
1.316081.6404394.471764e-08
1.322391.6403434.557068e-08
1.328741.6402474.642781e-08
1.335121.6401514.728906e-08
1.341531.6400554.815444e-08
1.347971.6399594.902398e-08
1.354441.6398624.989768e-08
1.360941.6397665.077559e-08
1.367471.6396695.165770e-08
1.374031.6395735.254405e-08
1.380631.6394765.343466e-08
1.387251.6393795.432954e-08
1.393911.6392815.522871e-08
1.40061.6391845.613220e-08
1.407331.6390865.704003e-08
1.414081.6389885.795221e-08
1.420871.638895.886878e-08
1.427691.6387925.978974e-08
1.434541.6386936.071512e-08
1.441431.6385946.164494e-08
1.448341.6384956.257923e-08
1.45531.6383966.351800e-08
1.462281.6382966.446128e-08
1.46931.6381976.540908e-08
1.476351.6380966.636144e-08
1.483441.6379966.731836e-08
1.490561.6378956.827988e-08
1.497711.6377946.924601e-08
1.50491.6376927.021679e-08
1.512131.6375917.119222e-08
1.519381.6374887.217233e-08
1.526681.6373867.315714e-08
1.531.6373397.360600e-08
1.5341.6372837.707723e-08
1.541371.637188.346062e-08
1.548771.6370768.987465e-08
1.55621.6369729.631947e-08
1.563671.6368671.027952e-07
1.571171.6367621.093021e-07
1.578711.6366571.158401e-07
1.586291.6365511.224096e-07
1.593911.6364441.290105e-07
1.601561.6363371.356432e-07
1.609241.636231.423077e-07
1.616971.6361221.490042e-07
1.624731.6360141.557328e-07
1.632531.6359051.624937e-07
1.640361.6357961.692871e-07
1.648241.6356861.761131e-07
1.656151.6355751.829718e-07
1.66411.6354641.898635e-07
1.672081.6353531.967882e-07
1.680111.635242.037462e-07
1.688171.6351272.107376e-07
1.696281.6350142.177625e-07
1.704421.63492.248212e-07
1.71261.6347852.319137e-07
1.720821.634672.390403e-07
1.729081.6345542.462011e-07
1.737381.6344372.533962e-07
1.745721.634322.606259e-07
1.75411.6342022.678903e-07
1.762521.6340832.751896e-07
1.770981.6339642.825239e-07
1.779481.6338432.898934e-07
1.788021.6337222.972982e-07
1.79661.6336013.047386e-07
1.805221.6334783.122148e-07
1.813891.6333553.197268e-07
1.822591.6332313.272748e-07
1.831341.6331063.348591e-07
1.840131.632983.424798e-07
1.848971.6328543.501371e-07
1.857841.6327263.578311e-07
1.866761.6325983.655621e-07
1.875721.6324693.733301e-07
1.884721.6323393.811355e-07
1.893771.6322083.889783e-07
1.902861.6320763.968588e-07
1.911991.6319434.047770e-07
1.921171.6318094.127333e-07
1.930391.6316754.207278e-07
1.939651.6315394.287607e-07
1.948961.6314024.368321e-07
1.958321.6312654.449422e-07
1.967721.6311264.530913e-07
1.971.6310924.550700e-07
1.977161.6309864.868652e-07
1.986651.6308465.289936e-07
1.996191.6307045.713243e-07
2.005771.6305616.138580e-07
2.01541.6304176.565960e-07
2.025071.6302726.995391e-07
2.034791.6301257.426883e-07
2.044561.6299787.860446e-07
2.054371.6298298.296090e-07
2.064231.6296798.733825e-07
2.074141.6295289.173661e-07
2.084091.6293769.615608e-07
2.09411.6292231.005968e-06
2.104151.6290681.050588e-06
2.114251.6289121.095422e-06
2.12441.6287551.140471e-06
2.134591.6285971.185737e-06
2.144841.6284371.231220e-06
2.155131.6282761.276921e-06
2.165481.6281131.322841e-06
2.175871.6279491.368982e-06
2.186321.6277841.415345e-06
2.196811.6276171.461930e-06
2.207351.6274491.508738e-06
2.217951.627281.555771e-06
2.228591.6271091.603030e-06
2.239291.6269361.650516e-06
2.250041.6267621.698230e-06
2.260841.6265861.746172e-06
2.271691.6264091.794345e-06
2.282591.6262311.842749e-06
2.293551.626051.891386e-06
2.304561.6258691.940256e-06
2.315621.6256851.989360e-06
2.3251.6255292.031000e-06
2.326731.62552.041288e-06
2.33791.6253132.107530e-06
2.349121.6251252.174089e-06
2.36041.6249342.240968e-06
2.371731.6247422.308168e-06
2.383111.6245492.375691e-06
2.394551.6243532.443537e-06
2.406041.6241562.511710e-06
2.417591.6239572.580209e-06
2.42921.6237562.649037e-06
2.440861.6235532.718196e-06
2.452571.6233482.787686e-06
2.464341.6231412.857510e-06
2.476171.6229322.927670e-06
2.488061.6227222.998166e-06
2.51.6225093.069000e-06

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
—