Optical constants

Refractive index of N-SK15 (SCHOTT)

N-SK15: n,k 0.334–2.5 µm

Data
formula 2 + tabulated k
Range
0.334–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.334–2.5 µm
Refractive index n
1.62296
Extinction coefficient k
1.35168e-08
Permittivity ε1
2.63399
Permittivity ε2
4.38743e-08
Absorption coefficient α
0.00289069 cm⁻¹
Penetration depth δ = λ/(2πk)
6.91877e+09 nm
Abbe number Vd
58.019
Chromatic dispersion dn/dλ
-0.0554104 µm⁻¹
Group index ng
1.65552
Group velocity dispersion
97.6683 fs²/mm
Dispersion parameter D
-532.833 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-SK15 (SCHOTT): N-SK15
schott_n_sk15 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SK15", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_sk15.range_nm)  # (334, 2500) nm
eps = schott_n_sk15.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=1.30417786λ2λ2−0.00695051276+0.28584116λ2λ2−0.0232023703+0.974781572λ2λ2−99.016884

Valid from 0.334 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.30417786
C30.00695051276
C40.28584116
C50.0232023703
C60.974781572
C799.016884

Comments and conditions

inquiry glass

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 4.92e-07 1.2e-08 -2.96e-12 4.66e-07 5.16e-10 0.179
nd
1.62296
Vd
58.02
glass code
623580.362
glass status
special
density
value: 3620
thermal expansion
value: 6.7e-06, temperature range: 243 343; value: 7.6e-06, temperature range: 293 573
dPgF
-0.0009
resistance
acid: 52.2; stain: 3.0; alkali: 2.0; climatic: 3.0; phosphate: 3.2

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 8.81e-07 K⁻¹ at 633 nm, dn/dT = 3.78e-07 K⁻¹ at 1310 nm, dn/dT = 3.38e-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 420 wavelengths, the same grid as the API and the library
N-SK15 (SCHOTT), N-SK15: n and k versus wavelength
λ (µm)nk
0.3341.6585051.823100e-06
0.3356891.6579361.698192e-06
0.3373871.6573741.572652e-06
0.3390931.656821.446477e-06
0.3408081.6562721.319664e-06
0.3425321.6557321.192210e-06
0.3442641.6551981.064111e-06
0.3460061.6546719.353644e-07
0.3477561.6541518.059665e-07
0.3495141.6536376.759141e-07
0.351.6534976.400100e-07
0.3512821.653136.074648e-07
0.3530591.6526285.623675e-07
0.3548441.6521345.170420e-07
0.3566391.6516454.714873e-07
0.3584431.6511624.257023e-07
0.3602561.6506853.796856e-07
0.3620781.6502153.334363e-07
0.3639091.6497492.869530e-07
0.3651.6494762.592600e-07
0.365751.649292.490890e-07
0.3675991.6488362.239869e-07
0.3694591.6483881.987578e-07
0.371.6482591.914100e-07
0.3713271.6479451.811475e-07
0.3732051.6475071.666247e-07
0.3750931.6470751.520284e-07
0.376991.6466481.373583e-07
0.3788961.6462261.226140e-07
0.381.6459851.140800e-07
0.3808131.6458091.109439e-07
0.3827391.6453971.035120e-07
0.3846741.644999.604256e-08
0.386621.6445888.853531e-08
0.3885751.644198.099010e-08
0.391.6439057.549300e-08
0.3905411.6437987.422151e-08
0.3925161.6434096.957641e-08
0.3945011.6430266.490783e-08
0.3964961.6426476.021563e-08
0.3985021.6422725.549970e-08
0.41.6419965.197600e-08
0.4005171.6419015.121254e-08
0.4025431.6415354.822185e-08
0.4045791.6411744.521603e-08
0.4051.6410994.459400e-08
0.4066251.6408164.357845e-08
0.4086811.6404624.229310e-08
0.4107481.6401134.100125e-08
0.4128261.6397673.970287e-08
0.4149141.6394263.839792e-08
0.4170121.6390883.708637e-08
0.4191211.6387553.576819e-08
0.421.6386173.521900e-08
0.4212411.6384253.488190e-08
0.4233721.6380983.430321e-08
0.4255131.6377763.372159e-08
0.4276651.6374573.313703e-08
0.4298281.6371423.254952e-08
0.4320021.636833.195903e-08
0.4341871.6365223.136555e-08
0.4361.6362693.087300e-08
0.4363831.6362173.080482e-08
0.438591.6359153.041150e-08
0.4408081.6356173.001620e-08
0.4430371.6353222.961889e-08
0.4452781.6350312.921958e-08
0.447531.6347422.881825e-08
0.4497941.6344572.841488e-08
0.4520681.6341752.800948e-08
0.4543551.6338962.760202e-08
0.4566531.633622.719251e-08
0.4589621.6333482.678092e-08
0.461.6332262.659600e-08
0.4612841.6330782.625585e-08
0.4636171.6328112.563761e-08
0.4659611.6325472.501624e-08
0.4683181.6322852.439172e-08
0.4706871.6320272.376405e-08
0.4730671.6317712.313320e-08
0.475461.6315182.249917e-08
0.4778641.6312682.186192e-08
0.4802811.6310212.122146e-08
0.482711.6307762.057775e-08
0.4851521.6305331.993079e-08
0.4876051.6302941.928055e-08
0.4900721.6300571.862703e-08
0.492551.6298221.797020e-08
0.4950411.629591.731005e-08
0.4975451.629361.664656e-08
0.51.6291381.599600e-08
0.5000611.6291321.599094e-08
0.5025911.6289071.578273e-08
0.5051321.6286851.557346e-08
0.5076871.6284641.536314e-08
0.5102551.6282461.515175e-08
0.5128361.628031.493929e-08
0.5154291.6278171.472576e-08
0.5180361.6276051.451115e-08
0.5206561.6273961.429545e-08
0.5232891.6271891.407867e-08
0.5259361.6269841.386078e-08
0.5285961.6267811.364180e-08
0.531271.626581.342170e-08
0.5339561.6263811.320050e-08
0.5366571.6261841.297817e-08
0.5393711.6259891.275472e-08
0.5420991.6257961.253014e-08
0.5448411.6256051.230442e-08
0.5461.6255251.220900e-08
0.5475971.6254161.224469e-08
0.5503661.6252291.230659e-08
0.553151.6250431.236881e-08
0.5559471.624861.243135e-08
0.5587591.6246781.249420e-08
0.5615851.6244981.255737e-08
0.5644251.624321.262086e-08
0.567281.6241431.268467e-08
0.5701491.6239681.274880e-08
0.5730331.6237951.281326e-08
0.5759311.6236241.287804e-08
0.5788441.6234541.294315e-08
0.581.6233871.296900e-08
0.5817711.6232861.309666e-08
0.5847141.6231191.330873e-08
0.5876711.6229541.352187e-08
0.5906431.6227911.373610e-08
0.593631.6226291.395140e-08
0.5966331.6224691.416780e-08
0.599651.622311.438529e-08
0.6026831.6221521.460388e-08
0.6057311.6219961.482357e-08
0.6087951.6218421.504438e-08
0.6118741.6216891.526630e-08
0.6149681.6215371.548935e-08
0.6180791.6213871.571352e-08
0.621.6212951.585200e-08
0.6212051.6212381.588278e-08
0.6243461.621091.596305e-08
0.6275041.6209441.604373e-08
0.6306781.6207991.612482e-08
0.6338681.6206551.620632e-08
0.6370731.6205131.628823e-08
0.6402961.6203721.637055e-08
0.6435341.6202321.645329e-08
0.6467891.6200931.653645e-08
0.650061.6199561.662003e-08
0.6533481.619821.670403e-08
0.6566521.6196851.678846e-08
0.6599731.6195511.687331e-08
0.661.619551.687400e-08
0.6633111.6194181.658718e-08
0.6666661.6192861.629658e-08
0.6700381.6191561.600450e-08
0.6734261.6190261.571095e-08
0.6768321.6188981.541591e-08
0.6802551.6187711.511938e-08
0.6836961.6186441.482134e-08
0.6871541.6185191.452181e-08
0.6906291.6183951.422075e-08
0.6941221.6182721.391818e-08
0.6976331.618151.361407e-08
0.71.6180681.340900e-08
0.7011611.6180281.346413e-08
0.7047071.6179081.363253e-08
0.7082711.6177891.380178e-08
0.7118541.6176711.397188e-08
0.7154541.6175531.414284e-08
0.7190721.6174371.431467e-08
0.7227091.6173211.448737e-08
0.7263641.6172061.466094e-08
0.7300381.6170921.483539e-08
0.733731.6169791.501072e-08
0.7374411.6168671.518694e-08
0.7411711.6167561.536404e-08
0.7449191.6166451.554205e-08
0.7486871.6165351.572095e-08
0.7524741.6164271.590076e-08
0.7562791.6163181.608148e-08
0.7601041.6162111.626312e-08
0.7639491.6161041.644567e-08
0.7678121.6159981.662914e-08
0.7716961.6158931.681355e-08
0.7755991.6157891.699888e-08
0.7795211.6156851.718515e-08
0.7834641.6155821.737237e-08
0.7874261.615481.756053e-08
0.7914091.6153781.774965e-08
0.7954111.6152771.793972e-08
0.7994341.6151761.813075e-08
0.8034781.6150771.832274e-08
0.8075411.6149771.851571e-08
0.8116251.6148791.870966e-08
0.815731.6147811.890458e-08
0.8198561.6146841.910049e-08
0.8240031.6145871.929740e-08
0.828171.6144911.949529e-08
0.8323591.6143951.969419e-08
0.8365681.61431.989410e-08
0.8407991.6142052.009501e-08
0.8450521.6141112.029695e-08
0.8493261.6140182.049990e-08
0.8536211.6139252.070388e-08
0.8579391.6138322.090889e-08
0.8622781.613742.111494e-08
0.8666391.6136492.132203e-08
0.8710221.6135582.153017e-08
0.8754271.6134672.173936e-08
0.8798551.6133772.194961e-08
0.8843051.6132872.216092e-08
0.8887771.6131982.237330e-08
0.8932721.6131092.258675e-08
0.897791.613022.280129e-08
0.9023311.6129322.301691e-08
0.9068951.6128452.323362e-08
0.9114811.6127572.345142e-08
0.9160911.612672.367033e-08
0.9207241.6125842.389035e-08
0.9253811.6124972.411147e-08
0.9300611.6124122.433372e-08
0.9347651.6123262.455709e-08
0.9394931.6122412.478159e-08
0.9442451.6121562.500722e-08
0.949021.6120712.523400e-08
0.953821.6119872.546192e-08
0.9586441.6119022.569100e-08
0.9634921.6118192.592123e-08
0.9683651.6117352.615263e-08
0.9732631.6116522.638520e-08
0.9781851.6115692.661895e-08
0.9831331.6114862.685387e-08
0.9881051.6114032.708999e-08
0.9931031.6113212.732730e-08
0.9981251.6112392.756581e-08
1.003171.6111572.780553e-08
1.008251.6110752.804646e-08
1.013351.6109932.828860e-08
1.018471.6109122.853198e-08
1.023621.6108312.877658e-08
1.02881.610752.902242e-08
1.0341.6106692.926950e-08
1.039231.6105882.951784e-08
1.044491.6105072.976742e-08
1.049771.6104263.001828e-08
1.055081.6103463.027040e-08
1.061.6102723.050400e-08
1.060421.6102663.058629e-08
1.065781.6101853.164519e-08
1.071171.6101053.270944e-08
1.076591.6100253.377908e-08
1.082031.6099453.485413e-08
1.087511.6098653.593461e-08
1.093011.6097853.702056e-08
1.098531.6097053.811200e-08
1.104091.6096253.920896e-08
1.109671.6095454.031147e-08
1.115291.6094664.141955e-08
1.120931.6093864.253324e-08
1.12661.6093064.365256e-08
1.132291.6092264.477755e-08
1.138021.6091464.590822e-08
1.143781.6090664.704461e-08
1.149561.6089874.818675e-08
1.155371.6089074.933466e-08
1.161221.6088275.048838e-08
1.167091.6087465.164794e-08
1.172991.6086665.281336e-08
1.178931.6085865.398467e-08
1.184891.6085065.516191e-08
1.190881.6084255.634510e-08
1.19691.6083455.753428e-08
1.202961.6082645.872947e-08
1.209041.6081835.993071e-08
1.215161.6081026.113802e-08
1.22131.6080216.235144e-08
1.227481.607946.357099e-08
1.233691.6078596.479671e-08
1.239931.6077776.602864e-08
1.24621.6076966.726679e-08
1.25251.6076146.851120e-08
1.258841.6075326.976191e-08
1.26521.6074497.101895e-08
1.27161.6073677.228234e-08
1.278031.6072847.355212e-08
1.28451.6072017.482832e-08
1.290991.6071187.611098e-08
1.297521.6070347.740013e-08
1.304091.6069517.869579e-08
1.310681.6068677.999801e-08
1.317311.6067828.130681e-08
1.323971.6066988.262224e-08
1.330671.6066138.394431e-08
1.33741.6065288.527308e-08
1.344161.6064428.660856e-08
1.350961.6063568.795080e-08
1.357791.606278.929982e-08
1.364661.6061849.065567e-08
1.371561.6060979.201838e-08
1.37851.606019.338798e-08
1.385471.6059229.476450e-08
1.392481.6058349.614799e-08
1.399521.6057469.753848e-08
1.40661.6056579.893599e-08
1.413711.6055681.003406e-07
1.420861.6054781.017523e-07
1.428051.6053881.031711e-07
1.435271.6052971.045971e-07
1.442531.6052061.060303e-07
1.449831.6051151.074708e-07
1.457161.6050231.089185e-07
1.464531.6049311.103736e-07
1.471941.6048381.118360e-07
1.479381.6047441.133059e-07
1.486861.604651.147831e-07
1.494381.6045561.162679e-07
1.501941.6044611.177601e-07
1.509541.6043651.192599e-07
1.517171.6042691.207673e-07
1.524851.6041731.222823e-07
1.531.6041081.233000e-07
1.532561.6040751.264235e-07
1.540311.6039771.358900e-07
1.54811.6038791.454045e-07
1.555931.603781.549670e-07
1.56381.603681.645779e-07
1.571711.603581.742375e-07
1.579661.6034791.839458e-07
1.587651.6033771.937033e-07
1.595681.6032752.035101e-07
1.603751.6031722.133666e-07
1.611861.6030682.232729e-07
1.620011.6029632.332292e-07
1.62821.6028582.432360e-07
1.636441.6027522.532933e-07
1.644711.6026462.634015e-07
1.653031.6025382.735609e-07
1.661391.602432.837716e-07
1.669791.6023212.940339e-07
1.678241.6022113.043482e-07
1.686731.6021013.147146e-07
1.695261.6019893.251335e-07
1.703831.6018773.356051e-07
1.712451.6017643.461296e-07
1.721111.601653.567073e-07
1.729821.6015353.673386e-07
1.738561.6014193.780236e-07
1.747361.6013023.887626e-07
1.756191.6011853.995560e-07
1.765081.6010664.104039e-07
1.7741.6009474.213068e-07
1.782981.6008264.322647e-07
1.791991.6007054.432781e-07
1.801061.6005824.543472e-07
1.810171.6004594.654723e-07
1.819321.6003344.766536e-07
1.828521.6002094.878915e-07
1.837771.6000824.991862e-07
1.847071.5999545.105381e-07
1.856411.5998265.219473e-07
1.86581.5996965.334143e-07
1.875231.5995655.449392e-07
1.884721.5994335.565225e-07
1.894251.5992995.681643e-07
1.903831.5991655.798650e-07
1.913461.5990295.916249e-07
1.923141.5988926.034443e-07
1.932861.5987546.153234e-07
1.942641.5986156.272627e-07
1.952461.5984746.392623e-07
1.962341.5983326.513226e-07
1.971.5982226.606800e-07
1.972261.5981896.790207e-07
1.982241.5980457.598634e-07
1.992261.5978998.411150e-07
2.002341.5977529.227775e-07
2.012471.5976031.004853e-06
2.022641.5974541.087344e-06
2.032871.5973021.170251e-06
2.043161.597151.253579e-06
2.053491.5969951.337327e-06
2.063881.596841.421499e-06
2.074311.5966831.506097e-06
2.08481.5965241.591123e-06
2.095351.5963641.676579e-06
2.105951.5962021.762467e-06
2.11661.5960391.848789e-06
2.12731.5958741.935548e-06
2.138061.5957072.022746e-06
2.148881.5955392.110384e-06
2.159741.595372.198466e-06
2.170671.5951982.286994e-06
2.181641.5950252.375969e-06
2.192681.594852.465394e-06
2.203771.5946732.555272e-06
2.214911.5944952.645604e-06
2.226121.5943152.736393e-06
2.237381.5941332.827641e-06
2.248691.5939492.919351e-06
2.260061.5937633.011524e-06
2.271491.5935753.104164e-06
2.282981.5933863.197272e-06
2.294531.5931943.290851e-06
2.306131.5933.384903e-06
2.31781.5928053.479431e-06
2.3251.5926843.537800e-06
2.329521.5926073.650794e-06
2.34131.5924083.945286e-06
2.353141.5922064.241267e-06
2.365051.5920024.538746e-06
2.377011.5917964.837728e-06
2.389031.5915885.138223e-06
2.401111.5913775.440238e-06
2.413261.5911655.743781e-06
2.425461.590956.048858e-06
2.437731.5907326.355479e-06
2.450061.5905136.663650e-06
2.462451.5902916.973380e-06
2.47491.5900677.284676e-06
2.487421.589847.597547e-06
2.51.5896117.912000e-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
—