Optical constants

Refractive index of N-SF8 (SCHOTT)

N-SF8: 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
1.68893
Extinction coefficient k
2.75127e-08
Permittivity ε1
2.85249
Permittivity ε2
9.29342e-08
Absorption coefficient α
0.00588385 cm⁻¹
Penetration depth δ = λ/(2πk)
3.39914e+09 nm
Abbe number Vd
31.308
Chromatic dispersion dn/dλ
-0.110831 µm⁻¹
Group index ng
1.75406
Group velocity dispersion
221.553 fs²/mm
Dispersion parameter D
-1208.69 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-SF8 (SCHOTT): N-SF8
schott_n_sf8 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SF8", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_sf8.range_nm)  # (370, 2500) nm
eps = schott_n_sf8.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=1.55075812λ2λ2−0.0114338344+0.209816918λ2λ2−0.0582725652+1.46205491λ2λ2−133.24165

Valid from 0.37 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.55075812
C30.0114338344
C40.209816918
C50.0582725652
C61.46205491
C7133.24165

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -1.94e-06 9.7e-09 -2.34e-11 8.32e-07 1.15e-09 0.276
nd
1.68894
Vd
31.31
glass code
689313.290
glass status
standard
density
value: 2904
thermal expansion
value: 8.56e-06, temperature range: 243 343; value: 9.92e-06, temperature range: 293 573
dPgF
0.0087
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 = 3.40e-07 K⁻¹ at 633 nm, dn/dT = -7.59e-07 K⁻¹ at 1310 nm, dn/dT = -8.34e-07 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-SF8 (SCHOTT), N-SF8: n and k versus wavelength
λ (µm)nk
0.371.7481113.131900e-06
0.3717761.7469542.789270e-06
0.373561.7458172.444995e-06
0.3753531.7447012.099068e-06
0.3771551.7436051.751480e-06
0.3789651.7425291.402224e-06
0.381.7419241.202600e-06
0.3807841.7414711.153268e-06
0.3826121.7404311.038300e-06
0.3844481.7394099.227810e-07
0.3862941.7384058.067074e-07
0.3881481.7374176.900766e-07
0.391.7364525.735700e-07
0.3900111.7364465.733082e-07
0.3918831.7354915.282328e-07
0.3937641.7345524.829411e-07
0.3956541.7336284.374320e-07
0.3975531.7327193.917045e-07
0.3994611.7318253.457574e-07
0.41.7315763.327800e-07
0.4013781.7309453.159279e-07
0.4033051.7300792.923740e-07
0.4051.7293322.716500e-07
0.4052411.7292272.700332e-07
0.4071861.7283882.569688e-07
0.409141.7275612.438416e-07
0.4111041.7267482.306515e-07
0.4130771.7259472.173980e-07
0.415061.7251582.040809e-07
0.4170521.7243811.906999e-07
0.4190541.7236161.772547e-07
0.421.723261.709000e-07
0.4210651.7228621.678307e-07
0.4230861.7221191.620076e-07
0.4251171.7213871.561565e-07
0.4271581.7206661.502774e-07
0.4292081.7199561.443700e-07
0.4312681.7192551.384343e-07
0.4333381.7185651.324701e-07
0.4354181.7178841.264773e-07
0.4361.7176961.248000e-07
0.4375081.7172131.226514e-07
0.4396081.7165521.196590e-07
0.4417181.71591.166522e-07
0.4438381.7152561.136309e-07
0.4459681.7146221.105952e-07
0.4481091.7139971.075449e-07
0.450261.713381.044800e-07
0.4524211.7127711.014003e-07
0.4545921.7121719.830587e-08
0.4567741.7115799.519659e-08
0.4589671.7109959.207237e-08
0.461.7107239.060000e-08
0.461171.7104188.970529e-08
0.4633831.7098498.801216e-08
0.4656071.7092888.631091e-08
0.4678421.7087348.460149e-08
0.4700881.7081888.288386e-08
0.4723441.7076488.115800e-08
0.4746111.7071167.942384e-08
0.4768891.706597.768137e-08
0.4791781.7060717.593053e-08
0.4814781.7055597.417128e-08
0.4837891.7050537.240360e-08
0.4861111.7045547.062743e-08
0.4884451.7040616.884273e-08
0.4907891.7035746.704946e-08
0.4931451.7030936.524759e-08
0.4955121.7026196.343707e-08
0.497891.702156.161787e-08
0.51.7017416.000400e-08
0.500281.7016875.982023e-08
0.5026811.7012295.824355e-08
0.5050941.7007785.665930e-08
0.5075181.7003315.506745e-08
0.5099541.699895.346796e-08
0.5124021.6994555.186079e-08
0.5148611.6990255.024590e-08
0.5173331.69864.862327e-08
0.5198161.6981794.699284e-08
0.5223111.6977644.535459e-08
0.5248181.6973544.370848e-08
0.5273371.6969494.205446e-08
0.5298681.6965494.039251e-08
0.5324111.6961533.872258e-08
0.5349671.6957613.704464e-08
0.5375341.6953753.535864e-08
0.5401141.6949933.366454e-08
0.5427071.6946153.196232e-08
0.5453121.6942413.025193e-08
0.5461.6941442.980000e-08
0.5479291.6938722.958604e-08
0.5505591.6935072.929435e-08
0.5532021.6931472.900125e-08
0.5558571.692792.870675e-08
0.5585251.6924372.841084e-08
0.5612061.6920882.811350e-08
0.5638991.6917442.781474e-08
0.5666061.6914032.751455e-08
0.5693261.6910652.721291e-08
0.5720581.6907322.690983e-08
0.5748041.6904022.660529e-08
0.5775631.6900762.629929e-08
0.581.6897922.602900e-08
0.5803351.6897532.609444e-08
0.5831211.6894342.663824e-08
0.585921.6891192.718465e-08
0.5887321.6888072.773368e-08
0.5915581.6884982.828535e-08
0.5943971.6881922.883966e-08
0.597251.687892.939664e-08
0.6001171.6875912.995629e-08
0.6029971.6872953.051862e-08
0.6058911.6870033.108366e-08
0.60881.6867133.165140e-08
0.6117221.6864273.222187e-08
0.6146581.6861433.279508e-08
0.6176081.6858623.337104e-08
0.621.6856383.383800e-08
0.6205731.6855853.386925e-08
0.6235511.685313.403180e-08
0.6265441.6850383.419514e-08
0.6295511.6847693.435927e-08
0.6325731.6845033.452418e-08
0.6356091.6842393.468988e-08
0.638661.6839783.485638e-08
0.6417261.683723.502367e-08
0.6448061.6834643.519177e-08
0.6479011.6832113.536068e-08
0.651011.682963.553040e-08
0.6541351.6827123.570093e-08
0.6572751.6824663.587228e-08
0.661.6822563.602100e-08
0.660431.6822233.594725e-08
0.66361.6819823.540321e-08
0.6667851.6817443.485655e-08
0.6699851.6815073.430728e-08
0.6732011.6812743.375537e-08
0.6764321.6810423.320081e-08
0.6796791.6808133.264358e-08
0.6829411.6805863.208369e-08
0.6862191.6803613.152110e-08
0.6895131.6801383.095582e-08
0.6928231.6799173.038782e-08
0.6961481.6796982.981709e-08
0.6994891.6794822.924363e-08
0.71.6794492.915600e-08
0.7028471.6792672.911287e-08
0.706221.6790552.906176e-08
0.709611.6788442.901041e-08
0.7130161.6786362.895881e-08
0.7164381.6784292.890696e-08
0.7198771.6782242.885486e-08
0.7233321.6780212.880251e-08
0.7268041.677822.874991e-08
0.7302931.6776212.869706e-08
0.7337981.6774232.864396e-08
0.737321.6772272.859060e-08
0.7408591.6770332.853698e-08
0.7444151.6768412.848311e-08
0.7479881.676652.842898e-08
0.7515781.6764622.837459e-08
0.7551861.6762742.831993e-08
0.7588111.6760892.826502e-08
0.7624531.6759042.820984e-08
0.7661121.6757222.815440e-08
0.769791.6755412.809869e-08
0.7734841.6753622.804271e-08
0.7771971.6751842.798646e-08
0.7809271.6750072.792995e-08
0.7846761.6748322.787316e-08
0.7884421.6746592.781610e-08
0.7922261.6744872.775877e-08
0.7960291.6743162.770116e-08
0.799851.6741472.764328e-08
0.8036891.6739792.758511e-08
0.8075461.6738122.752667e-08
0.8114221.6736472.746795e-08
0.8153171.6734832.740895e-08
0.8192311.673322.734966e-08
0.8231631.6731592.729009e-08
0.8271141.6729992.723023e-08
0.8310841.672842.717008e-08
0.8350731.6726822.710965e-08
0.8390811.6725252.704892e-08
0.8431081.672372.698791e-08
0.8471551.6722162.692660e-08
0.8512211.6720632.686500e-08
0.8553071.6719112.680310e-08
0.8594121.671762.674090e-08
0.8635371.671612.667841e-08
0.8676821.6714622.661562e-08
0.8718471.6713142.655252e-08
0.8760321.6711672.648912e-08
0.8802361.6710222.642542e-08
0.8844611.6708772.636141e-08
0.8887071.6707342.629710e-08
0.8929721.6705912.623247e-08
0.8972581.6704492.616754e-08
0.9015651.6703092.610229e-08
0.9058921.6701692.603673e-08
0.910241.670032.597086e-08
0.9146091.6698922.590467e-08
0.9189991.6697552.583816e-08
0.923411.6696192.577133e-08
0.9278431.6694832.570419e-08
0.9322961.6693492.563672e-08
0.9367711.6692152.556892e-08
0.9412671.6690822.550080e-08
0.9457851.668952.543236e-08
0.9503251.6688182.536358e-08
0.9548861.6686882.529448e-08
0.9594691.6685582.522504e-08
0.9640751.6684292.515527e-08
0.9687021.66832.508517e-08
0.9733521.6681732.501472e-08
0.9780231.6680452.494394e-08
0.9827181.6679192.487283e-08
0.9874351.6677932.480137e-08
0.9921741.6676682.472956e-08
0.9969361.6675442.465741e-08
1.001721.667422.458492e-08
1.006531.6672972.451208e-08
1.011361.6671752.443889e-08
1.016221.6670532.436534e-08
1.021091.6669312.429145e-08
1.025991.666812.421719e-08
1.030921.666692.414259e-08
1.035871.666572.406762e-08
1.040841.6664512.399230e-08
1.045831.6663322.391661e-08
1.050851.6662142.384056e-08
1.05591.6660962.376414e-08
1.061.6660012.370200e-08
1.060971.6659792.395821e-08
1.066061.6658622.530866e-08
1.071181.6657462.666559e-08
1.076321.665632.802904e-08
1.081481.6655152.939902e-08
1.086671.6653993.077559e-08
1.091891.6652853.215876e-08
1.097131.665173.354857e-08
1.10241.6650573.494505e-08
1.107691.6649433.634824e-08
1.1131.664833.775815e-08
1.118351.6647173.917484e-08
1.123711.6646044.059833e-08
1.129111.6644924.202865e-08
1.134531.664384.346583e-08
1.139971.6642694.490991e-08
1.145451.6641574.636092e-08
1.150941.6640464.781890e-08
1.156471.6639354.928388e-08
1.162021.6638255.075589e-08
1.16761.6637155.223496e-08
1.17321.6636055.372113e-08
1.178831.6634955.521444e-08
1.184491.6633855.671491e-08
1.190171.6632765.822259e-08
1.195891.6631665.973750e-08
1.201631.6630576.125968e-08
1.207391.6629486.278917e-08
1.213191.6628396.432600e-08
1.219011.6627316.587021e-08
1.224861.6626226.742183e-08
1.230741.6625146.898089e-08
1.236651.6624067.054744e-08
1.242591.6622977.212151e-08
1.248551.6621897.370313e-08
1.254541.6620817.529235e-08
1.260561.6619737.688919e-08
1.266621.6618657.849370e-08
1.272691.6617578.010591e-08
1.27881.661658.172586e-08
1.284941.6615428.335358e-08
1.291111.6614348.498912e-08
1.297311.6613268.663250e-08
1.303531.6612188.828378e-08
1.309791.661118.994298e-08
1.316081.6610029.161014e-08
1.322391.6608949.328531e-08
1.328741.6607869.496851e-08
1.335121.6606789.665980e-08
1.341531.660579.835920e-08
1.347971.6604621.000668e-07
1.354441.6603531.017825e-07
1.360941.6602451.035065e-07
1.367471.6601361.052388e-07
1.374031.6600281.069794e-07
1.380631.6599191.087283e-07
1.387251.659811.104856e-07
1.393911.6597011.122514e-07
1.40061.6595911.140256e-07
1.407331.6594821.158084e-07
1.414081.6593721.175997e-07
1.420871.6592621.193996e-07
1.427691.6591521.212082e-07
1.434541.6590411.230254e-07
1.441431.6589311.248513e-07
1.448341.658821.266861e-07
1.45531.6587091.285296e-07
1.462281.6585971.303819e-07
1.46931.6584851.322432e-07
1.476351.6583731.341134e-07
1.483441.6582611.359926e-07
1.490561.6581481.378808e-07
1.497711.6580351.397780e-07
1.50491.6579221.416844e-07
1.512131.6578081.435999e-07
1.519381.6576941.455246e-07
1.526681.657581.474586e-07
1.531.6575271.483400e-07
1.5341.6574651.549367e-07
1.541371.6573491.670676e-07
1.548771.6572341.792568e-07
1.55621.6571181.915044e-07
1.563671.6570012.038109e-07
1.571171.6568842.161764e-07
1.578711.6567672.286012e-07
1.586291.6566492.410858e-07
1.593911.656532.536302e-07
1.601561.6564112.662348e-07
1.609241.6562922.789000e-07
1.616971.6561722.916259e-07
1.624731.6560513.044129e-07
1.632531.655933.172613e-07
1.640361.6558093.301713e-07
1.648241.6556873.431433e-07
1.656151.6555643.561776e-07
1.66411.655443.692745e-07
1.672081.6553163.824342e-07
1.680111.6551923.956570e-07
1.688171.6550674.089434e-07
1.696281.6549414.222935e-07
1.704421.6548144.357077e-07
1.71261.6546874.491863e-07
1.720821.6545594.627295e-07
1.729081.6544314.763378e-07
1.737381.6543014.900114e-07
1.745721.6541715.037506e-07
1.75411.654045.175558e-07
1.762521.6539095.314272e-07
1.770981.6537765.453652e-07
1.779481.6536435.593701e-07
1.788021.6535095.734423e-07
1.79661.6533755.875819e-07
1.805221.6532396.017895e-07
1.813891.6531036.160652e-07
1.822591.6529666.304095e-07
1.831341.6528276.448226e-07
1.840131.6526886.593049e-07
1.848971.6525496.738567e-07
1.857841.6524086.884783e-07
1.866761.6522667.031701e-07
1.875721.6521237.179325e-07
1.884721.651987.327657e-07
1.893771.6518357.476701e-07
1.902861.6516897.626460e-07
1.911991.6515437.776938e-07
1.921171.6513957.928139e-07
1.930391.6512478.080065e-07
1.939651.6510978.232720e-07
1.948961.6509468.386108e-07
1.958321.6507948.540233e-07
1.967721.6506418.695097e-07
1.971.6506048.732700e-07
1.977161.6504879.319249e-07
1.986651.6503321.009642e-06
1.996191.6501751.087732e-06
2.005771.6500181.166198e-06
2.01541.6498591.245039e-06
2.025071.6496991.324259e-06
2.034791.6495381.403860e-06
2.044561.6493761.483842e-06
2.054371.6492121.564209e-06
2.064231.6490471.644961e-06
2.074141.6488811.726100e-06
2.084091.6487131.807630e-06
2.09411.6485441.889550e-06
2.104151.6483741.971864e-06
2.114251.6482022.054573e-06
2.12441.6480292.137678e-06
2.134591.6478552.221183e-06
2.144841.6476792.305088e-06
2.155131.6475022.389397e-06
2.165481.6473232.474109e-06
2.175871.6471432.559229e-06
2.186321.6469612.644757e-06
2.196811.6467782.730695e-06
2.207351.6465932.817046e-06
2.217951.6464072.903812e-06
2.228591.6462192.990994e-06
2.239291.6460293.078594e-06
2.250041.6458383.166615e-06
2.260841.6456453.255058e-06
2.271691.645453.343926e-06
2.282591.6452543.433221e-06
2.293551.6450563.522944e-06
2.304561.6448563.613097e-06
2.315621.6446553.703684e-06
2.3251.6444833.780500e-06
2.326731.6444513.800920e-06
2.33791.6442463.932395e-06
2.349121.6440394.064501e-06
2.36041.643834.197241e-06
2.371731.643624.330618e-06
2.383111.6434074.464635e-06
2.394551.6431924.599295e-06
2.406041.6429764.734602e-06
2.417591.6427574.870558e-06
2.42921.6425375.007167e-06
2.440861.6423145.144431e-06
2.452571.6420895.282355e-06
2.464341.6418625.420940e-06
2.476171.6416335.560191e-06
2.488061.6414025.700110e-06
2.51.6411695.840700e-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
—