Optical constants

Refractive index of N-SK16 (SCHOTT)

N-SK16: n,k 0.31–2.5 µm

Data
formula 2 + tabulated k
Range
0.31–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.31–2.5 µm
Refractive index n
1.62041
Extinction coefficient k
1.16339e-08
Permittivity ε1
2.62572
Permittivity ε2
3.77033e-08
Absorption coefficient α
0.00248801 cm⁻¹
Penetration depth δ = λ/(2πk)
8.03854e+09 nm
Abbe number Vd
60.324
Chromatic dispersion dn/dλ
-0.0531891 µm⁻¹
Group index ng
1.65166
Group velocity dispersion
92.1981 fs²/mm
Dispersion parameter D
-502.989 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-SK16 (SCHOTT): N-SK16
schott_n_sk16 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SK16", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_sk16.range_nm)  # (310, 2500) nm
eps = schott_n_sk16.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=1.34317774λ2λ2−0.00704687339+0.241144399λ2λ2−0.0229005+0.994317969λ2λ2−92.7508526

Valid from 0.31 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.34317774
C30.00704687339
C40.241144399
C50.0229005
C60.994317969
C792.7508526

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -2.37e-08 1.32e-08 -1.29e-11 4.09e-07 5.17e-10 0.17
nd
1.62041
Vd
60.32
glass code
620603.358
glass status
standard
density
value: 3580
thermal expansion
value: 6.3e-06, temperature range: 243 343; value: 7.3e-06, temperature range: 293 573
dPgF
-0.0011
resistance
acid: 53.3; stain: 4.0; alkali: 3.3; climatic: 4.0; phosphate: 3.2

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 5.38e-07 K⁻¹ at 633 nm, dn/dT = 1.07e-07 K⁻¹ at 1310 nm, dn/dT = 7.26e-08 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 422 wavelengths, the same grid as the API and the library
N-SK16 (SCHOTT), N-SK16: n and k versus wavelength
λ (µm)nk
0.311.6628353.860200e-06
0.3116261.6621643.598089e-06
0.3132611.6615023.334604e-06
0.3149041.6608493.069737e-06
0.3165561.6602052.803480e-06
0.3182161.659572.535826e-06
0.3198851.6589432.266769e-06
0.321.6589012.248300e-06
0.3215631.6583252.106017e-06
0.323251.6577151.952506e-06
0.3249461.6571131.798189e-06
0.326651.656521.643063e-06
0.3283641.6559341.487124e-06
0.3300861.6553561.330366e-06
0.3318181.6547851.172786e-06
0.3335581.6542221.014380e-06
0.3341.6540819.741600e-07
0.3353081.6536669.270166e-07
0.3370671.6531188.636112e-07
0.3388351.6525777.998733e-07
0.3406121.6520427.358010e-07
0.3423991.6515156.713926e-07
0.3441951.6509946.066464e-07
0.3461.650485.415605e-07
0.3478151.6499734.761333e-07
0.349641.6494724.103628e-07
0.351.6493743.973700e-07
0.3514741.6489783.755468e-07
0.3533171.6484893.482437e-07
0.3551711.6480073.207973e-07
0.3570341.6475312.932070e-07
0.3589061.6470612.654719e-07
0.3607891.6465972.375913e-07
0.3626821.6461392.095645e-07
0.3645841.6456861.813907e-07
0.3651.6455891.752300e-07
0.3664961.645241.638632e-07
0.3684191.6447981.492603e-07
0.371.6444411.372500e-07
0.3703511.6443621.355117e-07
0.3722941.6439321.259013e-07
0.3742471.6435061.162405e-07
0.376211.6430861.065290e-07
0.3781831.6426719.676662e-08
0.381.6422968.778000e-08
0.3801671.6422618.724639e-08
0.3821611.6418568.088104e-08
0.3841661.6414567.448230e-08
0.3861811.6410616.805000e-08
0.3882071.6406716.158396e-08
0.391.6403315.586000e-08
0.3902431.6402855.544482e-08
0.392291.6399045.194894e-08
0.3943481.6395274.843472e-08
0.3964161.6391554.490206e-08
0.3984961.6387884.135088e-08
0.41.6385263.878200e-08
0.4005861.6384253.821688e-08
0.4026871.6380663.619085e-08
0.40481.6377113.415418e-08
0.4051.6376783.396100e-08
0.4069231.637363.324474e-08
0.4090581.6370143.244971e-08
0.4112031.6366723.165051e-08
0.413361.6363333.084711e-08
0.4155281.6359993.003951e-08
0.4177081.6356682.922766e-08
0.4198991.6353422.841156e-08
0.421.6353272.837400e-08
0.4221021.6350192.814399e-08
0.4243161.63472.790168e-08
0.4265421.6343842.765810e-08
0.4287791.6340722.741325e-08
0.4310281.6337642.716711e-08
0.4332891.6334592.691967e-08
0.4355621.6331582.667094e-08
0.4361.6331012.662300e-08
0.4378471.632862.639171e-08
0.4401431.6325662.610405e-08
0.4424521.6322752.581487e-08
0.4447731.6319872.552418e-08
0.4471061.6317022.523197e-08
0.4494511.6314212.493822e-08
0.4518091.6311432.464294e-08
0.4541791.6308682.434610e-08
0.4565611.6305952.404771e-08
0.4589561.6303262.374775e-08
0.461.6302112.361700e-08
0.4613641.630062.330243e-08
0.4637841.6297972.274412e-08
0.4662161.6295372.218288e-08
0.4686621.629282.161870e-08
0.471121.6290252.105156e-08
0.4735921.6287732.048144e-08
0.4760761.6285241.990833e-08
0.4785731.6282781.933222e-08
0.4810831.6280351.875308e-08
0.4836071.6277941.817091e-08
0.4861441.6275551.758568e-08
0.4886941.627321.699738e-08
0.4912571.6270861.640600e-08
0.4938341.6268561.581151e-08
0.4964241.6266271.521391e-08
0.4990281.6264011.461317e-08
0.51.6263181.438900e-08
0.5016461.6261781.424838e-08
0.5042771.6259571.402357e-08
0.5069221.6257381.379758e-08
0.5095821.6255221.357040e-08
0.5122551.6253081.334204e-08
0.5149421.6250961.311247e-08
0.5176431.6248861.288170e-08
0.5203581.6246781.264972e-08
0.5230871.6244731.241653e-08
0.5258311.624271.218211e-08
0.528591.6240691.194646e-08
0.5313621.623871.170957e-08
0.5341491.6236731.147145e-08
0.5369511.6234781.123207e-08
0.5397681.6232851.099144e-08
0.5425991.6230941.074954e-08
0.5454451.6229041.050638e-08
0.5461.6228681.045900e-08
0.5483071.6227171.050323e-08
0.5511831.6225321.055839e-08
0.5540741.6223481.061383e-08
0.556981.6221671.066956e-08
0.5599021.6219871.072559e-08
0.5628391.6218091.078191e-08
0.5657911.6216321.083853e-08
0.5687591.6214581.089544e-08
0.5717421.6212851.095265e-08
0.5747421.6211141.101016e-08
0.5777561.6209441.106797e-08
0.581.620821.111100e-08
0.5807871.6207761.116514e-08
0.5838331.620611.137474e-08
0.5868961.6204451.158544e-08
0.5899741.6202821.179724e-08
0.5930691.6201211.201016e-08
0.596181.6199611.222419e-08
0.5993071.6198021.243934e-08
0.6024511.6196451.265563e-08
0.6056111.619491.287304e-08
0.6087881.6193361.309160e-08
0.6119811.6191831.331131e-08
0.6151911.6190321.353216e-08
0.6184181.6188821.375418e-08
0.621.6188091.386300e-08
0.6216621.6187331.381230e-08
0.6249231.6185861.371284e-08
0.6282011.618441.361287e-08
0.6314961.6182961.351236e-08
0.6348091.6181531.341133e-08
0.6381391.6180111.330977e-08
0.6414861.617871.320768e-08
0.6448511.6177311.310505e-08
0.6482341.6175931.300188e-08
0.6516341.6174561.289817e-08
0.6550521.617321.279392e-08
0.6584881.6171851.268912e-08
0.661.6171261.264300e-08
0.6619421.6170521.246275e-08
0.6654141.6169191.214049e-08
0.6689051.6167881.181653e-08
0.6724131.6166581.149088e-08
0.6759411.6165291.116352e-08
0.6794861.6164011.083444e-08
0.683051.6162741.050364e-08
0.6866331.6161481.017110e-08
0.6902351.6160239.836813e-09
0.6938561.6158999.500775e-09
0.6974951.6157769.162974e-09
0.71.6156938.930500e-09
0.7011541.6156548.956087e-09
0.7048321.6155339.037639e-09
0.7085291.6154139.119618e-09
0.7122461.6152949.202028e-09
0.7159821.6151769.284870e-09
0.7197371.6150599.368147e-09
0.7235131.6149429.451860e-09
0.7273081.6148279.536013e-09
0.7311231.6147129.620607e-09
0.7349581.6145989.705644e-09
0.7388131.6144859.791128e-09
0.7426891.6143739.877060e-09
0.7465841.6142629.963443e-09
0.7505011.6141511.005028e-08
0.7544371.6140411.013757e-08
0.7583951.6139321.022532e-08
0.7623731.6138241.031353e-08
0.7663721.6137171.040220e-08
0.7703921.613611.049134e-08
0.7744331.6135041.058094e-08
0.7784951.6133981.067102e-08
0.7825791.6132931.076157e-08
0.7866841.6131891.085259e-08
0.790811.6130861.094409e-08
0.7949581.6129831.103607e-08
0.7991281.6128811.112853e-08
0.803321.6127791.122148e-08
0.8075341.6126781.131492e-08
0.811771.6125781.140884e-08
0.8160281.6124781.150326e-08
0.8203081.6123791.159817e-08
0.8246111.6122811.169358e-08
0.8289371.6121821.178949e-08
0.8332851.6120851.188591e-08
0.8376561.6119881.198283e-08
0.842051.6118911.208026e-08
0.8464671.6117951.217820e-08
0.8509071.61171.227665e-08
0.855371.6116051.237562e-08
0.8598571.611511.247511e-08
0.8643671.6114161.257512e-08
0.8689011.6113231.267566e-08
0.8734591.6112291.277672e-08
0.8780411.6111361.287831e-08
0.8826471.6110441.298044e-08
0.8872771.6109521.308310e-08
0.8919311.610861.318630e-08
0.8966091.6107691.329004e-08
0.9013131.6106781.339433e-08
0.906041.6105881.349916e-08
0.9107931.6104981.360454e-08
0.9155711.6104081.371048e-08
0.9203731.6103181.381697e-08
0.9252011.6102291.392402e-08
0.9300541.610141.403163e-08
0.9349331.6100521.413980e-08
0.9398371.6099631.424855e-08
0.9447671.6098751.435786e-08
0.9497221.6097881.446775e-08
0.9547041.60971.457821e-08
0.9597121.6096131.468925e-08
0.9647461.6095261.480088e-08
0.9698071.6094391.491309e-08
0.9748941.6093521.502589e-08
0.9800081.6092661.513928e-08
0.9851481.609181.525327e-08
0.9903161.6090941.536785e-08
0.995511.6090081.548303e-08
1.000731.6089221.559882e-08
1.005981.6088371.571522e-08
1.011261.6087511.583223e-08
1.016561.6086661.594985e-08
1.02191.6085811.606808e-08
1.027261.6084961.618694e-08
1.032641.6084111.630642e-08
1.038061.6083261.642653e-08
1.043511.6082411.654727e-08
1.048981.6081561.666864e-08
1.054481.6080721.679065e-08
1.061.6079871.691300e-08
1.060011.6079871.691630e-08
1.065571.6079031.829320e-08
1.071161.6078181.967733e-08
1.076781.6077342.106871e-08
1.082431.6076492.246739e-08
1.088111.6075652.387341e-08
1.093821.607482.528680e-08
1.099551.6073962.670761e-08
1.105321.6073112.813587e-08
1.111121.6072262.957163e-08
1.116951.6071423.101491e-08
1.122811.6070573.246576e-08
1.12871.6069723.392423e-08
1.134621.6068873.539034e-08
1.140571.6068033.686415e-08
1.146551.6067183.834569e-08
1.152561.6066323.983499e-08
1.158611.6065474.133211e-08
1.164691.6064624.283709e-08
1.17081.6063764.434996e-08
1.176941.6062914.587076e-08
1.183111.6062054.739954e-08
1.189321.6061194.893634e-08
1.195561.6060325.048120e-08
1.201831.6059465.203416e-08
1.208131.605865.359527e-08
1.214471.6057735.516457e-08
1.220841.6056865.674210e-08
1.227241.6055995.832791e-08
1.233681.6055115.992204e-08
1.240151.6054236.152452e-08
1.246661.6053356.313541e-08
1.25321.6052476.475475e-08
1.259771.6051596.638259e-08
1.266381.605076.801897e-08
1.273021.6049816.966392e-08
1.27971.6048917.131751e-08
1.286411.6048017.297977e-08
1.293161.6047117.465075e-08
1.299941.6046217.633050e-08
1.306761.604537.801905e-08
1.313621.6044397.971647e-08
1.320511.6043478.142278e-08
1.327431.6042558.313805e-08
1.33441.6041638.486232e-08
1.34141.604078.659563e-08
1.348431.6039778.833803e-08
1.355511.6038839.008957e-08
1.362621.6037899.185030e-08
1.369761.6036959.362026e-08
1.376951.60369.539951e-08
1.384171.6035049.718810e-08
1.391431.6034089.898606e-08
1.398731.6033121.007935e-07
1.406071.6032151.026103e-07
1.413441.6031171.044367e-07
1.420861.6030191.062727e-07
1.428311.602921.081183e-07
1.43581.6028211.099736e-07
1.443331.6027211.118387e-07
1.45091.6026211.137135e-07
1.458521.602521.155981e-07
1.466171.6024181.174927e-07
1.473861.6023161.193971e-07
1.481591.6022131.213116e-07
1.489361.602111.232361e-07
1.497171.6020061.251707e-07
1.505031.6019011.271154e-07
1.512921.6017951.290704e-07
1.520861.6016891.310356e-07
1.528831.6015821.330111e-07
1.531.6015661.333000e-07
1.536851.6014741.437087e-07
1.544911.6013661.559532e-07
1.553021.6012571.682620e-07
1.561161.6011471.806353e-07
1.569351.6010361.930735e-07
1.577591.6009252.055770e-07
1.585861.6008122.181461e-07
1.594181.6006992.307811e-07
1.602541.6005852.434823e-07
1.610951.600472.562502e-07
1.61941.6003542.690851e-07
1.627891.6002382.819873e-07
1.636431.600122.949571e-07
1.645021.6000023.079950e-07
1.653641.5998823.211013e-07
1.662321.5997623.342764e-07
1.671041.5996413.475205e-07
1.67981.5995183.608342e-07
1.688611.5993953.742176e-07
1.697471.5992713.876713e-07
1.706381.5991454.011955e-07
1.715331.5990194.147907e-07
1.724321.5988924.284572e-07
1.733371.5987634.421953e-07
1.742461.5986344.560056e-07
1.75161.5985034.698883e-07
1.760791.5983714.838438e-07
1.770031.5982384.978725e-07
1.779311.5981045.119748e-07
1.788641.5979695.261510e-07
1.798031.5978325.404016e-07
1.807461.5976945.547270e-07
1.816941.5975555.691275e-07
1.826471.5974155.836036e-07
1.836051.5972745.981556e-07
1.845681.5971316.127839e-07
1.855361.5969876.274890e-07
1.865091.5968416.422712e-07
1.874881.5966956.571309e-07
1.884711.5965466.720686e-07
1.89461.5963976.870846e-07
1.904541.5962467.021794e-07
1.914531.5960937.173534e-07
1.924571.595947.326069e-07
1.934671.5957847.479405e-07
1.944811.5956277.633545e-07
1.955011.5954697.788494e-07
1.965271.5953097.944256e-07
1.971.5952358.016100e-07
1.975581.5951488.606749e-07
1.985941.5949859.703923e-07
1.996361.594821.080685e-06
2.006831.5946541.191557e-06
2.017361.5944861.303010e-06
2.027941.5943161.415047e-06
2.038581.5941451.527673e-06
2.049271.5939721.640889e-06
2.060021.5937971.754699e-06
2.070831.5936211.869106e-06
2.081691.5934421.984113e-06
2.092611.5932622.099724e-06
2.103581.593082.215940e-06
2.114621.5928962.332767e-06
2.125711.592712.450206e-06
2.136861.5925232.568261e-06
2.148071.5923332.686936e-06
2.159341.5921412.806233e-06
2.170661.5919472.926156e-06
2.182051.5917523.046708e-06
2.19351.5915543.167892e-06
2.2051.5913543.289712e-06
2.216571.5911523.412170e-06
2.22821.5909473.535272e-06
2.239881.5907413.659019e-06
2.251631.5905323.783415e-06
2.263441.5903213.908463e-06
2.275321.5901084.034168e-06
2.287251.5898924.160532e-06
2.299251.5896754.287558e-06
2.311311.5894544.415251e-06
2.323431.5892314.543614e-06
2.3251.5892034.560200e-06
2.335621.5890064.934047e-06
2.347871.5887795.365283e-06
2.360191.5885485.798782e-06
2.372571.5883166.234554e-06
2.385011.588086.672613e-06
2.397521.5878427.112969e-06
2.41011.5876017.555635e-06
2.422741.5873588.000623e-06
2.435451.5871128.447945e-06
2.448231.5868638.897614e-06
2.461071.5866119.349641e-06
2.473981.5863569.804040e-06
2.486951.5860991.026082e-05
2.51.5858381.072000e-05

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
—