Optical constants

Refractive index of N-SSK8 (SCHOTT)

N-SSK8: n,k 0.35–2.5 µm

Data
formula 2 + tabulated k
Range
0.35–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.35–2.5 µm
Refractive index n
1.61773
Extinction coefficient k
1.57801e-08
Permittivity ε1
2.61704
Permittivity ε2
5.10559e-08
Absorption coefficient α
0.00337473 cm⁻¹
Penetration depth δ = λ/(2πk)
5.92640e+09 nm
Abbe number Vd
49.829
Chromatic dispersion dn/dλ
-0.0635467 µm⁻¹
Group index ng
1.65507
Group velocity dispersion
116.287 fs²/mm
Dispersion parameter D
-634.409 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-SSK8 (SCHOTT): N-SSK8
schott_n_ssk8 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SSK8", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_ssk8.range_nm)  # (350, 2500) nm
eps = schott_n_ssk8.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=1.44857867λ2λ2−0.00869310149+0.117965926λ2λ2−0.0421566593+1.06937528λ2λ2−111.300666

Valid from 0.35 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.44857867
C30.00869310149
C40.117965926
C50.0421566593
C61.06937528
C7111.300666

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 5.34e-07 1.27e-08 -1.75e-11 5.4e-07 7.05e-10 0.224
nd
1.61773
Vd
49.83
glass code
618498.327
glass status
standard
density
value: 3268
thermal expansion
value: 7.21e-06, temperature range: 243 343; value: 8.16e-06, temperature range: 293 573
dPgF
0.0002
resistance
acid: 1.0; stain: 0.0; alkali: 1.3; climatic: 1.0; phosphate: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 1.03e-06 K⁻¹ at 633 nm, dn/dT = 4.18e-07 K⁻¹ at 1310 nm, dn/dT = 3.71e-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 419 wavelengths, the same grid as the API and the library
N-SSK8 (SCHOTT), N-SSK8: n and k versus wavelength
λ (µm)nk
0.351.6546645.130500e-06
0.3517291.6540294.695989e-06
0.3534661.6534044.259331e-06
0.3552121.6527883.820516e-06
0.3569671.652183.379534e-06
0.358731.6515822.936373e-06
0.3605021.6509912.491023e-06
0.3622831.6504092.043474e-06
0.3640731.6498361.593713e-06
0.3651.6495431.360700e-06
0.3658711.649271.287468e-06
0.3676791.6487121.135559e-06
0.3694951.6481629.829000e-07
0.371.648019.404400e-07
0.371321.6476198.826428e-07
0.3731541.6470848.023327e-07
0.3749981.6465567.216260e-07
0.376851.6460356.405206e-07
0.3787121.6455215.590145e-07
0.381.6451715.026000e-07
0.3805821.6450144.885667e-07
0.3824621.6445144.432571e-07
0.3843521.644023.977238e-07
0.386251.6435333.519655e-07
0.3881581.6430533.059812e-07
0.391.6425972.615900e-07
0.3900761.6425782.608436e-07
0.3920021.642112.418002e-07
0.3939391.6416482.226628e-07
0.3958851.6411922.034308e-07
0.397841.6407421.841039e-07
0.3998061.6402971.646814e-07
0.41.6402531.627600e-07
0.4017811.6398581.531701e-07
0.4037651.6394251.424805e-07
0.4051.6391591.358300e-07
0.405761.6389971.332843e-07
0.4077641.6385741.265683e-07
0.4097781.6381571.198190e-07
0.4118031.6377451.130365e-07
0.4138371.6373381.062204e-07
0.4158811.6369379.937062e-08
0.4179351.636549.248704e-08
0.421.6361488.556944e-08
0.421.6361488.556900e-08
0.4220751.6357618.275952e-08
0.424161.6353787.993598e-08
0.4262551.6357.709849e-08
0.428361.6346277.424698e-08
0.4304761.6342587.138139e-08
0.4326031.6338946.850165e-08
0.434741.6335346.560768e-08
0.4361.6333246.390100e-08
0.4368871.6331786.324323e-08
0.4390451.6328276.164335e-08
0.4412141.6324796.003556e-08
0.4433941.6321365.841983e-08
0.4455841.6317975.679612e-08
0.4477851.6314625.516438e-08
0.4499971.6311315.352459e-08
0.452221.6308035.187670e-08
0.4544541.630485.022066e-08
0.4566991.630164.855645e-08
0.4589551.6298444.688402e-08
0.461.6296994.610900e-08
0.4612221.6295314.548478e-08
0.46351.6292224.432067e-08
0.465791.6289174.315081e-08
0.468091.6286154.197517e-08
0.4704031.6283164.079372e-08
0.4727261.6280213.960644e-08
0.4750621.6277293.841329e-08
0.4774081.6274413.721425e-08
0.4797671.6271553.600928e-08
0.4821361.6268733.479837e-08
0.4845181.6265943.358147e-08
0.4869121.6263183.235856e-08
0.4893171.6260453.112961e-08
0.4917341.6257762.989458e-08
0.4941631.6255092.865346e-08
0.4966041.6252452.740621e-08
0.4990571.6249842.615280e-08
0.51.6248842.567100e-08
0.5015221.6247252.528345e-08
0.5041.624472.465273e-08
0.5064891.6242172.401890e-08
0.5089911.6239672.338194e-08
0.5115061.623722.274184e-08
0.5140321.6234762.209857e-08
0.5165711.6232342.145212e-08
0.5191231.6229942.080248e-08
0.5216881.6227572.014963e-08
0.5242651.6225231.949356e-08
0.5268541.6222911.883424e-08
0.5294571.6220621.817167e-08
0.5320721.6218351.750583e-08
0.5347011.621611.683669e-08
0.5373421.6213881.616426e-08
0.5399961.6211681.548850e-08
0.5426641.620951.480940e-08
0.5453441.6207351.412694e-08
0.5461.6206821.396000e-08
0.5480381.6205211.401209e-08
0.5507451.620311.408128e-08
0.5534661.6201011.415082e-08
0.55621.6198951.422070e-08
0.5589471.619691.429092e-08
0.5617081.6194871.436149e-08
0.5644831.6192871.443241e-08
0.5672721.6190881.450368e-08
0.5700741.6188921.457530e-08
0.572891.6186971.464727e-08
0.575721.6185041.471960e-08
0.5785641.6183141.479229e-08
0.581.6182181.482900e-08
0.5814221.6181251.500691e-08
0.5842941.6179381.536635e-08
0.587181.6177531.572757e-08
0.590081.6175691.609057e-08
0.5929951.6173881.645536e-08
0.5959251.6172081.682196e-08
0.5988681.617031.719037e-08
0.6018271.6168531.756059e-08
0.6047991.6166791.793265e-08
0.6077871.6165061.830654e-08
0.6107891.6163341.868228e-08
0.6138061.6161651.905988e-08
0.6168391.6159971.943934e-08
0.6198861.615831.982068e-08
0.621.6158241.983500e-08
0.6229481.6156651.977295e-08
0.6260251.6155021.970818e-08
0.6291171.615341.964308e-08
0.6322251.6151791.957766e-08
0.6353481.615021.951192e-08
0.6384861.6148631.944586e-08
0.641641.6147071.937947e-08
0.644811.6145521.931275e-08
0.6479951.6143991.924570e-08
0.6511961.6142471.917832e-08
0.6544131.6140971.911061e-08
0.6576461.6139481.904256e-08
0.661.613841.899300e-08
0.6608941.61381.886818e-08
0.6641591.6136531.841243e-08
0.667441.6135081.795443e-08
0.6707371.6133641.749417e-08
0.674051.6132211.703164e-08
0.677381.613081.656682e-08
0.6807261.612941.609970e-08
0.6840881.6128011.563028e-08
0.6874671.6126631.515854e-08
0.6908631.6125261.468447e-08
0.6942761.6123911.420806e-08
0.6977061.6122561.372929e-08
0.71.6121671.340900e-08
0.7011521.6121231.344194e-08
0.7046161.6119911.354097e-08
0.7080961.611861.364049e-08
0.7115941.611731.374050e-08
0.7151091.6116011.384100e-08
0.7186421.6114731.394200e-08
0.7221921.6113461.404350e-08
0.7257591.611221.414550e-08
0.7293441.6110961.424800e-08
0.7329471.6109721.435101e-08
0.7365681.6108491.445453e-08
0.7402061.6107271.455856e-08
0.7438621.6106061.466310e-08
0.7475371.6104861.476816e-08
0.751231.6103671.487374e-08
0.754941.6102481.497984e-08
0.758671.6101311.508647e-08
0.7624171.6100151.519362e-08
0.7661841.6098991.530130e-08
0.7699681.6097841.540951e-08
0.7737721.609671.551826e-08
0.7775941.6095571.562754e-08
0.7814351.6094451.573737e-08
0.7852951.6093331.584773e-08
0.7891741.6092231.595864e-08
0.7930731.6091131.607010e-08
0.796991.6090041.618212e-08
0.8009271.6088951.629468e-08
0.8048841.6087871.640780e-08
0.808861.608681.652148e-08
0.8128551.6085741.663572e-08
0.816871.6084681.675052e-08
0.8209061.6083641.686589e-08
0.8249611.6082591.698183e-08
0.8290361.6081561.709835e-08
0.8331311.6080531.721544e-08
0.8372471.6079511.733311e-08
0.8413821.6078491.745136e-08
0.8455391.6077481.757019e-08
0.8497151.6076481.768961e-08
0.8539131.6075481.780962e-08
0.8581311.6074481.793022e-08
0.862371.607351.805142e-08
0.866631.6072521.817322e-08
0.8709111.6071541.829562e-08
0.8752131.6070571.841862e-08
0.8795361.6069611.854224e-08
0.8838811.6068651.866646e-08
0.8882471.6067691.879129e-08
0.8926351.6066741.891675e-08
0.8970441.606581.904282e-08
0.9014751.6064861.916951e-08
0.9059281.6063921.929683e-08
0.9104031.6062991.942478e-08
0.9149011.6062071.955337e-08
0.919421.6061141.968258e-08
0.9239621.6060231.981244e-08
0.9285261.6059311.994293e-08
0.9331131.605842.007408e-08
0.9377221.605752.020586e-08
0.9423541.605662.033830e-08
0.9470091.605572.047140e-08
0.9516871.6054812.060515e-08
0.9563881.6053922.073956e-08
0.9611121.6053032.087464e-08
0.965861.6052152.101038e-08
0.9706311.6051272.114680e-08
0.9754261.6050392.128389e-08
0.9802441.6049522.142165e-08
0.9850861.6048652.156010e-08
0.9899531.6047782.169923e-08
0.9948431.6046912.183904e-08
0.9997571.6046052.197955e-08
1.00471.6045192.212075e-08
1.009661.6044342.226265e-08
1.014651.6043482.240525e-08
1.019661.6042632.254856e-08
1.024691.6041782.269257e-08
1.029761.6040932.283729e-08
1.034841.6040092.298273e-08
1.039961.6039252.312889e-08
1.045091.6038412.327577e-08
1.050251.6037572.342337e-08
1.055441.6036732.357171e-08
1.061.60362.370200e-08
1.060661.6035892.380634e-08
1.06591.6035062.463893e-08
1.071161.6034232.547564e-08
1.076451.603342.631648e-08
1.081771.6032572.716148e-08
1.087111.6031742.801064e-08
1.092481.6030912.886401e-08
1.097881.6030082.972159e-08
1.10331.6029263.058340e-08
1.108751.6028433.144947e-08
1.114231.6027613.231982e-08
1.119731.6026793.319447e-08
1.125271.6025963.407344e-08
1.130821.6025143.495675e-08
1.136411.6024323.584443e-08
1.142021.602353.673649e-08
1.147671.6022683.763296e-08
1.153331.6021863.853385e-08
1.159031.6021043.943920e-08
1.164761.6020224.034902e-08
1.170511.601944.126333e-08
1.176291.6018584.218216e-08
1.18211.6017764.310552e-08
1.187941.6016944.403345e-08
1.193811.6016124.496596e-08
1.199711.6015294.590308e-08
1.205631.6014474.684483e-08
1.211591.6013654.779123e-08
1.217571.6012834.874230e-08
1.223591.60124.969808e-08
1.229631.6011185.065857e-08
1.235711.6010355.162381e-08
1.241811.6009525.259381e-08
1.247951.6008695.356861e-08
1.254111.6007865.454823e-08
1.260311.6007035.553268e-08
1.266531.600625.652199e-08
1.272791.6005365.751620e-08
1.279071.6004535.851531e-08
1.285391.6003695.951936e-08
1.291741.6002856.052837e-08
1.298121.6002016.154236e-08
1.304541.6001176.256136e-08
1.310981.6000326.358540e-08
1.317461.5999486.461449e-08
1.323961.5998636.564867e-08
1.33051.5997776.668796e-08
1.337081.5996926.773238e-08
1.343681.5996066.878196e-08
1.350321.599526.983672e-08
1.356991.5994347.089669e-08
1.363691.5993487.196190e-08
1.370431.5992617.303238e-08
1.37721.5991747.410814e-08
1.3841.5990867.518921e-08
1.390841.5989997.627562e-08
1.397711.5989117.736740e-08
1.404611.5988227.846458e-08
1.411551.5987347.956717e-08
1.418521.5986458.067521e-08
1.425531.5985558.178873e-08
1.432571.5984668.290774e-08
1.439651.5983758.403228e-08
1.446761.5982858.516238e-08
1.453911.5981948.629806e-08
1.461091.5981038.743935e-08
1.468311.5980118.858627e-08
1.475561.5979198.973887e-08
1.482851.5978269.089715e-08
1.490171.5977339.206116e-08
1.497531.5976399.323092e-08
1.504931.5975459.440645e-08
1.512371.5974519.558779e-08
1.519841.5973569.677497e-08
1.527341.597269.796802e-08
1.531.5972279.839000e-08
1.534891.5971641.046381e-07
1.542471.5970681.143274e-07
1.550091.5969711.240645e-07
1.557751.5968731.338497e-07
1.565441.5967751.436833e-07
1.573181.5966761.535654e-07
1.580951.5965771.634964e-07
1.588761.5964771.734764e-07
1.59661.5963771.835057e-07
1.604491.5962761.935845e-07
1.612421.5961742.037132e-07
1.620381.5960722.138918e-07
1.628391.5959692.241208e-07
1.636431.5958652.344003e-07
1.644511.5957612.447305e-07
1.652641.5956562.551118e-07
1.66081.595552.655444e-07
1.6691.5954442.760285e-07
1.677251.5953372.865644e-07
1.685531.5952292.971523e-07
1.693861.5951213.077925e-07
1.702231.5950113.184853e-07
1.710641.5949013.292310e-07
1.719091.5947913.400297e-07
1.727581.5946793.508817e-07
1.736111.5945673.617873e-07
1.744691.5944533.727469e-07
1.753311.5943393.837605e-07
1.761971.5942253.948286e-07
1.770671.5941094.059513e-07
1.779421.5939924.171290e-07
1.788211.5938754.283619e-07
1.797041.5937574.396503e-07
1.805921.5936374.509944e-07
1.814841.5935174.623946e-07
1.82381.5933964.738511e-07
1.832811.5932744.853642e-07
1.841871.5931514.969341e-07
1.850961.5930275.085612e-07
1.860111.5929025.202458e-07
1.86931.5927765.319880e-07
1.878531.592655.437883e-07
1.887811.5925225.556469e-07
1.897141.5923935.675640e-07
1.906511.5922625.795400e-07
1.915921.5921315.915752e-07
1.925391.5919996.036698e-07
1.93491.5918666.158242e-07
1.944461.5917316.280386e-07
1.954061.5915966.403133e-07
1.963721.5914596.526487e-07
1.971.591376.606800e-07
1.973421.5913216.839105e-07
1.983161.5911827.502098e-07
1.992961.5910428.168366e-07
2.00281.59098.837926e-07
2.01271.5907579.510793e-07
2.022641.5906131.018698e-06
2.032631.5904681.086651e-06
2.042671.5903211.154940e-06
2.052761.5901731.223566e-06
2.06291.5900241.292531e-06
2.073091.5898741.361837e-06
2.083331.5897221.431485e-06
2.093631.5895681.501477e-06
2.103971.5894141.571815e-06
2.114361.5892581.642501e-06
2.12481.58911.713535e-06
2.13531.5889411.784921e-06
2.145851.5887811.856659e-06
2.156451.5886191.928751e-06
2.16711.5884552.001200e-06
2.177811.588292.074006e-06
2.188561.5881232.147172e-06
2.199371.5879552.220699e-06
2.210241.5877852.294590e-06
2.221161.5876142.368846e-06
2.232131.5874412.443468e-06
2.243161.5872662.518459e-06
2.254241.587092.593821e-06
2.265371.5869122.669555e-06
2.276561.5867322.745663e-06
2.287811.586552.822147e-06
2.299111.5863672.899008e-06
2.310471.5861822.976250e-06
2.321881.5859953.053873e-06
2.3251.5859433.075100e-06
2.333351.5858063.223191e-06
2.344871.5856153.427652e-06
2.356461.5854233.633124e-06
2.36811.5852283.839610e-06
2.37981.5850314.047116e-06
2.391551.5848334.255648e-06
2.403371.5846334.465209e-06
2.415241.584434.675806e-06
2.427171.5842254.887443e-06
2.439161.5840195.100125e-06
2.451211.583815.313858e-06
2.463311.5835995.528647e-06
2.475481.5833865.744496e-06
2.487711.5831715.961412e-06
2.51.5829536.179400e-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
—