Optical constants

Refractive index of N-SK2 (SCHOTT)

N-SK2: 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
1.60738
Extinction coefficient k
9.75245e-09
Permittivity ε1
2.58367
Permittivity ε2
3.13518e-08
Absorption coefficient α
0.00208565 cm⁻¹
Penetration depth δ = λ/(2πk)
9.58933e+09 nm
Abbe number Vd
56.65
Chromatic dispersion dn/dλ
-0.0552596 µm⁻¹
Group index ng
1.63985
Group velocity dispersion
98.4398 fs²/mm
Dispersion parameter D
-537.041 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-SK2 (SCHOTT): N-SK2
schott_n_sk2 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SK2", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_sk2.range_nm)  # (310, 2500) nm
eps = schott_n_sk2.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=1.28189012λ2λ2−0.0072719164+0.257738258λ2λ2−0.0242823527+0.96818604λ2λ2−110.377773

Valid from 0.31 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.28189012
C30.0072719164
C40.257738258
C50.0242823527
C60.96818604
C7110.377773

Comments and conditions

step 0.5 available

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 3.8e-06 1.41e-08 2.28e-11 6.44e-07 8.03e-11 0.108
nd
1.60738
Vd
56.65
glass code
607567.355
glass status
standard
density
value: 3550
thermal expansion
value: 6e-06, temperature range: 243 343; value: 7.1e-06, temperature range: 293 573
dPgF
-0.0008
resistance
acid: 2.2; stain: 0.0; alkali: 1.0; climatic: 2.0; phosphate: 2.3

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 2.68e-06 K⁻¹ at 633 nm, dn/dT = 2.01e-06 K⁻¹ at 1310 nm, dn/dT = 1.95e-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 422 wavelengths, the same grid as the API and the library
N-SK2 (SCHOTT), N-SK2: n and k versus wavelength
λ (µm)nk
0.311.6525353.176300e-06
0.3116261.6518092.943833e-06
0.3132611.6510932.710147e-06
0.3149041.6503872.475235e-06
0.3165561.6496922.239091e-06
0.3182161.6490062.001708e-06
0.3198851.6483291.763080e-06
0.321.6482831.746700e-06
0.3215631.6476621.636337e-06
0.323251.6470041.517264e-06
0.3249461.6463561.397567e-06
0.326651.6457161.277242e-06
0.3283641.6450851.156286e-06
0.3300861.6444631.034695e-06
0.3318181.6438499.124664e-07
0.3335581.6432437.895967e-07
0.3341.6430917.584000e-07
0.3353081.6426467.190377e-07
0.3370671.6420566.660975e-07
0.3388351.6414756.128795e-07
0.3406121.6409015.593825e-07
0.3423991.6403355.056048e-07
0.3441951.6397764.515450e-07
0.3461.6392253.972017e-07
0.3478151.6386813.425733e-07
0.349641.6381442.876583e-07
0.351.6380392.768100e-07
0.3514741.6376142.591331e-07
0.3533171.6370912.370173e-07
0.3551711.6365752.147856e-07
0.3570341.6360661.924372e-07
0.3589061.6355631.699716e-07
0.3607891.6350661.473881e-07
0.3626821.6345761.246862e-07
0.3645841.6340921.018652e-07
0.3651.6339889.687500e-08
0.3664961.6336158.969192e-08
0.3684191.6331438.046378e-08
0.371.6327627.287400e-08
0.3703511.6326787.160790e-08
0.3722941.6322186.460827e-08
0.3742471.6317645.757193e-08
0.376211.6313165.049867e-08
0.3781831.6308734.338832e-08
0.381.6304733.684300e-08
0.3801671.6304363.666754e-08
0.3821611.6300053.457447e-08
0.3841661.6295793.247042e-08
0.3861811.6291583.035534e-08
0.3882071.6287422.822916e-08
0.391.628382.634700e-08
0.3902431.6283312.620575e-08
0.392291.6279262.501644e-08
0.3943481.6275252.382089e-08
0.3964161.6271292.261907e-08
0.3984961.6267392.141094e-08
0.41.626462.053700e-08
0.4005861.6263522.041357e-08
0.4026871.6259711.997104e-08
0.40481.6255941.952619e-08
0.4051.6255591.948400e-08
0.4069231.6252221.975053e-08
0.4090581.6248542.004637e-08
0.4112031.6244912.034377e-08
0.413361.6241322.064272e-08
0.4155281.6237772.094324e-08
0.4177081.6234262.124534e-08
0.4198991.623082.154902e-08
0.421.6230642.156300e-08
0.4221021.6227382.204193e-08
0.4243161.62242.254648e-08
0.4265421.6220662.305367e-08
0.4287791.6217352.356352e-08
0.4310281.6214092.407604e-08
0.4332891.6210862.459125e-08
0.4355621.6207672.510917e-08
0.4361.6207072.520900e-08
0.4378471.6204522.520107e-08
0.4401431.6201412.519122e-08
0.4424521.6198332.518131e-08
0.4447731.6195292.517135e-08
0.4471061.6192282.516134e-08
0.4494511.6189312.515127e-08
0.4518091.6186372.514115e-08
0.4541791.6183462.513098e-08
0.4565611.6180592.512076e-08
0.4589561.6177752.511048e-08
0.461.6176532.510600e-08
0.4613641.6174952.479545e-08
0.4637841.6172172.424428e-08
0.4662161.6169432.369022e-08
0.4686621.6166722.313325e-08
0.471121.6164032.257336e-08
0.4735921.6161382.201053e-08
0.4760761.6158762.144475e-08
0.4785731.6156172.087601e-08
0.4810831.615362.030428e-08
0.4836071.6151071.972955e-08
0.4861441.6148561.915180e-08
0.4886941.6146081.857103e-08
0.4912571.6143631.798721e-08
0.4938341.614121.740032e-08
0.4964241.613881.681036e-08
0.4990281.6136431.621731e-08
0.51.6135561.599600e-08
0.5016461.6134091.573536e-08
0.5042771.6131761.531867e-08
0.5069221.6129471.489980e-08
0.5095821.612721.447872e-08
0.5122551.6124951.405544e-08
0.5149421.6122731.362994e-08
0.5176431.6120531.320221e-08
0.5203581.6118361.277223e-08
0.5230871.6116211.234000e-08
0.5258311.6114081.190550e-08
0.528591.6111971.146872e-08
0.5313621.6109891.102965e-08
0.5341491.6107831.058828e-08
0.5369511.6105791.014459e-08
0.5397681.6103779.698579e-09
0.5425991.6101779.250224e-09
0.5454451.609988.799517e-09
0.5461.6099428.711700e-09
0.5483071.6097848.748496e-09
0.5511831.6095918.794379e-09
0.5540741.6093998.840502e-09
0.556981.609218.886868e-09
0.5599021.6090228.933476e-09
0.5628391.6088378.980329e-09
0.5657911.6086539.027428e-09
0.5687591.6084719.074774e-09
0.5717421.6082919.122368e-09
0.5747421.6081139.170212e-09
0.5777561.6079369.218307e-09
0.581.6078079.254100e-09
0.5807871.6077629.305700e-09
0.5838331.6075899.505467e-09
0.5868961.6074189.706282e-09
0.5899741.6072489.908150e-09
0.5930691.6070811.011108e-08
0.596181.6069151.031507e-08
0.5993071.606751.052013e-08
0.6024511.6065871.072627e-08
0.6056111.6064261.093348e-08
0.6087881.6062661.114179e-08
0.6119811.6061081.135119e-08
0.6151911.6059521.156168e-08
0.6184181.6057971.177328e-08
0.621.6057221.187700e-08
0.6216621.6056431.190883e-08
0.6249231.6054911.197128e-08
0.6282011.605341.203405e-08
0.6314961.6051911.209716e-08
0.6348091.6050431.216059e-08
0.6381391.6048971.222436e-08
0.6414861.6047521.228846e-08
0.6448511.6046081.235290e-08
0.6482341.6044661.241767e-08
0.6516341.6043251.248279e-08
0.6550521.6041851.254824e-08
0.6584881.6040461.261404e-08
0.661.6039861.264300e-08
0.6619421.6039091.257144e-08
0.6654141.6037731.244348e-08
0.6689051.6036381.231486e-08
0.6724131.6035051.218557e-08
0.6759411.6033721.205559e-08
0.6794861.6032411.192494e-08
0.683051.6031111.179359e-08
0.6866331.6029821.166156e-08
0.6902351.6028551.152884e-08
0.6938561.6027281.139542e-08
0.6974951.6026021.126130e-08
0.71.6025171.116900e-08
0.7011541.6024781.118741e-08
0.7048321.6023541.124609e-08
0.7085291.6022321.130508e-08
0.7122461.6021111.136438e-08
0.7159821.601991.142400e-08
0.7197371.6018711.148392e-08
0.7235131.6017521.154416e-08
0.7273081.6016351.160471e-08
0.7311231.6015191.166558e-08
0.7349581.6014031.172677e-08
0.7388131.6012881.178829e-08
0.7426891.6011751.185012e-08
0.7465841.6010621.191228e-08
0.7505011.600951.197476e-08
0.7544371.6008391.203758e-08
0.7583951.6007291.210072e-08
0.7623731.6006191.216419e-08
0.7663721.6005111.222800e-08
0.7703921.6004031.229214e-08
0.7744331.6002961.235662e-08
0.7784951.600191.242143e-08
0.7825791.6000851.248659e-08
0.7866841.599981.255209e-08
0.790811.5998761.261793e-08
0.7949581.5997731.268411e-08
0.7991281.5996711.275065e-08
0.803321.5995691.281753e-08
0.8075341.5994681.288476e-08
0.811771.5993681.295235e-08
0.8160281.5992681.302029e-08
0.8203081.5991691.308859e-08
0.8246111.5990711.315724e-08
0.8289371.5989741.322626e-08
0.8332851.5988771.329564e-08
0.8376561.598781.336538e-08
0.842051.5986841.343548e-08
0.8464671.5985891.350596e-08
0.8509071.5984941.357680e-08
0.855371.59841.364802e-08
0.8598571.5983071.371961e-08
0.8643671.5982141.379157e-08
0.8689011.5981211.386392e-08
0.8734591.598031.393664e-08
0.8780411.5979381.400974e-08
0.8826471.5978471.408323e-08
0.8872771.5977571.415710e-08
0.8919311.5976671.423136e-08
0.8966091.5975781.430601e-08
0.9013131.5974891.438105e-08
0.906041.59741.445649e-08
0.9107931.5973121.453232e-08
0.9155711.5972241.460855e-08
0.9203731.5971371.468518e-08
0.9252011.597051.476221e-08
0.9300541.5969641.483964e-08
0.9349331.5968781.491748e-08
0.9398371.5967921.499573e-08
0.9447671.5967071.507439e-08
0.9497221.5966221.515346e-08
0.9547041.5965371.523295e-08
0.9597121.5964531.531285e-08
0.9647461.5963691.539317e-08
0.9698071.5962851.547392e-08
0.9748941.5962021.555508e-08
0.9800081.5961191.563668e-08
0.9851481.5960361.571870e-08
0.9903161.5959541.580115e-08
0.995511.5958721.588403e-08
1.000731.595791.596735e-08
1.005981.5957081.605111e-08
1.011261.5956261.613530e-08
1.016561.5955451.621994e-08
1.02191.5954641.630502e-08
1.027261.5953831.639055e-08
1.032641.5953031.647652e-08
1.038061.5952221.656295e-08
1.043511.5951421.664983e-08
1.048981.5950621.673716e-08
1.054481.5949821.682496e-08
1.061.5949031.691300e-08
1.060011.5949031.691419e-08
1.065571.5948231.740967e-08
1.071161.5947441.790775e-08
1.076781.5946641.840844e-08
1.082431.5945851.891175e-08
1.088111.5945061.941771e-08
1.093821.5944271.992632e-08
1.099551.5943482.043760e-08
1.105321.5942692.095156e-08
1.111121.594192.146822e-08
1.116951.5941122.198759e-08
1.122811.5940332.250968e-08
1.12871.5939542.303451e-08
1.134621.5938762.356209e-08
1.140571.5937972.409244e-08
1.146551.5937192.462558e-08
1.152561.593642.516151e-08
1.158611.5935622.570025e-08
1.164691.5934832.624181e-08
1.17081.5934052.678622e-08
1.176941.5933262.733348e-08
1.183111.5932472.788362e-08
1.189321.5931692.843664e-08
1.195561.593092.899256e-08
1.201831.5930112.955139e-08
1.208131.5929323.011316e-08
1.214471.5928533.067787e-08
1.220841.5927743.124555e-08
1.227241.5926953.181620e-08
1.233681.5926163.238985e-08
1.240151.5925363.296651e-08
1.246661.5924573.354619e-08
1.25321.5923773.412891e-08
1.259771.5922973.471469e-08
1.266381.5922173.530354e-08
1.273021.5921373.589548e-08
1.27971.5920573.649053e-08
1.286411.5919763.708869e-08
1.293161.5918953.769000e-08
1.299941.5918143.829446e-08
1.306761.5917333.890209e-08
1.313621.5916523.951290e-08
1.320511.591574.012692e-08
1.327431.5914884.074416e-08
1.33441.5914064.136464e-08
1.34141.5913244.198838e-08
1.348431.5912414.261538e-08
1.355511.5911584.324568e-08
1.362621.5910754.387928e-08
1.369761.5909914.451620e-08
1.376951.5909074.515646e-08
1.384171.5908234.580009e-08
1.391431.5907394.644709e-08
1.398731.5906544.709748e-08
1.406071.5905684.775129e-08
1.413441.5904834.840852e-08
1.420861.5903974.906920e-08
1.428311.590314.973335e-08
1.43581.5902245.040098e-08
1.443331.5901365.107212e-08
1.45091.5900495.174677e-08
1.458521.5899615.242496e-08
1.466171.5898725.310671e-08
1.473861.5897835.379204e-08
1.481591.5896945.448096e-08
1.489361.5896045.517349e-08
1.497171.5895145.586966e-08
1.505031.5894235.656948e-08
1.512921.5893325.727297e-08
1.520861.589245.798015e-08
1.528831.5891475.869104e-08
1.531.5891345.879500e-08
1.536851.5890546.496683e-08
1.544911.5889617.222724e-08
1.553021.5888677.952573e-08
1.561161.5887728.686250e-08
1.569351.5886779.423776e-08
1.577591.5885811.016517e-07
1.585861.5884851.091045e-07
1.594181.5883881.165965e-07
1.602541.588291.241277e-07
1.610951.5881921.316984e-07
1.61941.5880931.393089e-07
1.627891.5879931.469593e-07
1.636431.5878931.546497e-07
1.645021.5877921.623806e-07
1.653641.587691.701520e-07
1.662321.5875881.779641e-07
1.671041.5874851.858173e-07
1.67981.5873811.937116e-07
1.688611.5872762.016473e-07
1.697471.5871712.096247e-07
1.706381.5870642.176439e-07
1.715331.5869572.257051e-07
1.724321.5868492.338087e-07
1.733371.5867412.419548e-07
1.742461.5866312.501436e-07
1.75161.5865212.583753e-07
1.760791.586412.666502e-07
1.770031.5862982.749686e-07
1.779311.5861852.833305e-07
1.788641.5860712.917364e-07
1.798031.5859563.001863e-07
1.807461.585843.086805e-07
1.816941.5857233.172193e-07
1.826471.5856053.258029e-07
1.836051.5854873.344315e-07
1.845681.5853673.431054e-07
1.855361.5852463.518248e-07
1.865091.5851253.605899e-07
1.874881.5850023.694010e-07
1.884711.5848783.782583e-07
1.89461.5847533.871621e-07
1.904541.5846273.961125e-07
1.914531.58454.051100e-07
1.924571.5843724.141546e-07
1.934671.5842424.232466e-07
1.944811.5841114.323864e-07
1.955011.583984.415741e-07
1.965271.5838474.508100e-07
1.971.5837854.550700e-07
1.975581.5837134.798352e-07
1.985941.5835775.258383e-07
1.996361.583445.720828e-07
2.006831.5833026.185698e-07
2.017361.5831636.653007e-07
2.027941.5830237.122767e-07
2.038581.5828817.594991e-07
2.049271.5827378.069692e-07
2.060021.5825938.546884e-07
2.070831.5824479.026578e-07
2.081691.5822999.508788e-07
2.092611.5821519.993528e-07
2.103581.5821.048081e-06
2.114621.5818481.097065e-06
2.125711.5816951.146306e-06
2.136861.581541.195805e-06
2.148071.5813841.245564e-06
2.159341.5812261.295583e-06
2.170661.5810671.345866e-06
2.182051.5809061.396411e-06
2.19351.5807431.447222e-06
2.2051.5805791.498300e-06
2.216571.5804131.549646e-06
2.22821.5802451.601260e-06
2.239881.5800761.653146e-06
2.251631.5799051.705304e-06
2.263441.5797321.757735e-06
2.275321.5795571.810441e-06
2.287251.5793811.863424e-06
2.299251.5792021.916685e-06
2.311311.5790221.970225e-06
2.323431.578842.024046e-06
2.3251.5788162.031000e-06
2.335621.5786562.154446e-06
2.347871.578472.296843e-06
2.360191.5782822.439987e-06
2.372571.5780922.583881e-06
2.385011.57792.728530e-06
2.397521.5777062.873938e-06
2.41011.577513.020109e-06
2.422741.5773113.167047e-06
2.435451.5771113.314755e-06
2.448231.5769083.463238e-06
2.461071.5767043.612500e-06
2.473981.5764963.762545e-06
2.486951.5762873.913377e-06
2.51.5760764.065000e-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
—