Optical constants

Refractive index of N-SK2HT (SCHOTT)

N-SK2HT: 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
5.99587e-09
Permittivity ε1
2.58367
Permittivity ε2
1.92753e-08
Absorption coefficient α
0.00128227 cm⁻¹
Penetration depth δ = λ/(2πk)
1.55973e+10 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-SK2HT (SCHOTT): N-SK2HT
schott_n_sk2ht = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SK2HT", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_sk2ht.range_nm)  # (310, 2500) nm
eps = schott_n_sk2ht.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

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-SK2HT (SCHOTT), N-SK2HT: n and k versus wavelength
λ (µm)nk
0.311.6525352.354400e-06
0.3116261.6518092.147333e-06
0.3132611.6510931.939180e-06
0.3149041.6503871.729934e-06
0.3165561.6496921.519592e-06
0.3182161.6490061.308145e-06
0.3198851.6483291.095590e-06
0.321.6482831.081000e-06
0.3215631.6476621.002122e-06
0.323251.6470049.170195e-07
0.3249461.6463568.314705e-07
0.326651.6457167.454727e-07
0.3283641.6450856.590237e-07
0.3300861.6444635.721214e-07
0.3318181.6438494.847631e-07
0.3335581.6432433.969467e-07
0.3341.6430913.746500e-07
0.3353081.6426463.544355e-07
0.3370671.6420563.272481e-07
0.3388351.6414752.999181e-07
0.3406121.6409012.724448e-07
0.3423991.6403352.448273e-07
0.3441951.6397762.170650e-07
0.3461.6392251.891570e-07
0.3478151.6386811.611027e-07
0.349641.6381441.329011e-07
0.351.6380391.273300e-07
0.3514741.6376141.198377e-07
0.3533171.6370911.104640e-07
0.3551711.6365751.010411e-07
0.3570341.6360669.156879e-08
0.3589061.6355638.204680e-08
0.3607891.6350667.247486e-08
0.3626821.6345766.285271e-08
0.3645841.6340925.318009e-08
0.3651.6339885.106500e-08
0.3664961.6336154.724585e-08
0.3684191.6331434.233938e-08
0.371.6327623.830400e-08
0.3703511.6326783.781672e-08
0.3722941.6322183.512283e-08
0.3742471.6317643.241480e-08
0.376211.6313162.969256e-08
0.3781831.6308732.695605e-08
0.381.6304732.443700e-08
0.3801671.6304362.432108e-08
0.3821611.6300052.293833e-08
0.3841661.6295792.154833e-08
0.3861811.6291582.015104e-08
0.3882071.6287421.874642e-08
0.391.628381.750300e-08
0.3902431.6283311.738857e-08
0.392291.6279261.642504e-08
0.3943481.6275251.545646e-08
0.3964161.6271291.448280e-08
0.3984961.6267391.350403e-08
0.41.626461.279600e-08
0.4005861.6263521.266225e-08
0.4026871.6259711.218274e-08
0.40481.6255941.170072e-08
0.4051.6255591.165500e-08
0.4069231.6252221.153744e-08
0.4090581.6248541.140695e-08
0.4112031.6244911.127578e-08
0.413361.6241321.114391e-08
0.4155281.6237771.101136e-08
0.4177081.6234261.087811e-08
0.4198991.623081.074416e-08
0.421.6230641.073800e-08
0.4221021.6227381.097563e-08
0.4243161.62241.122596e-08
0.4265421.6220661.147761e-08
0.4287791.6217351.173058e-08
0.4310281.6214091.198487e-08
0.4332891.6210861.224050e-08
0.4355621.6207671.249747e-08
0.4361.6207071.254700e-08
0.4378471.6204521.248652e-08
0.4401431.6201411.241131e-08
0.4424521.6198331.233569e-08
0.4447731.6195291.225968e-08
0.4471061.6192281.218328e-08
0.4494511.6189311.210647e-08
0.4518091.6186371.202926e-08
0.4541791.6183461.195164e-08
0.4565611.6180591.187362e-08
0.4589561.6177751.179519e-08
0.461.6176531.176100e-08
0.4613641.6174951.163203e-08
0.4637841.6172171.140314e-08
0.4662161.6169431.117304e-08
0.4686621.6166721.094174e-08
0.471121.6164031.070922e-08
0.4735921.6161381.047548e-08
0.4760761.6158761.024052e-08
0.4785731.6156171.000432e-08
0.4810831.615369.766888e-09
0.4836071.6151079.528208e-09
0.4861441.6148569.288277e-09
0.4886941.6146089.047086e-09
0.4912571.6143638.804631e-09
0.4938341.614128.560903e-09
0.4964241.613888.315897e-09
0.4990281.6136438.069606e-09
0.51.6135567.977700e-09
0.5016461.6134097.879091e-09
0.5042771.6131767.721443e-09
0.5069221.6129477.562968e-09
0.5095821.612727.403663e-09
0.5122551.6124957.243521e-09
0.5149421.6122737.082539e-09
0.5176431.6120536.920713e-09
0.5203581.6118366.758039e-09
0.5230871.6116216.594511e-09
0.5258311.6114086.430125e-09
0.528591.6111976.264876e-09
0.5313621.6109896.098761e-09
0.5341491.6107835.931775e-09
0.5369511.6105795.763913e-09
0.5397681.6103775.595170e-09
0.5425991.6101775.425542e-09
0.5454451.609985.255024e-09
0.5461.6099425.221800e-09
0.5483071.6097845.243855e-09
0.5511831.6095915.271356e-09
0.5540741.6093995.299001e-09
0.556981.609215.326791e-09
0.5599021.6090225.354727e-09
0.5628391.6088375.382809e-09
0.5657911.6086535.411039e-09
0.5687591.6084715.439417e-09
0.5717421.6082915.467943e-09
0.5747421.6081135.496620e-09
0.5777561.6079365.525446e-09
0.581.6078075.546900e-09
0.5807871.6077625.593387e-09
0.5838331.6075895.773359e-09
0.5868961.6074185.954276e-09
0.5899741.6072486.136141e-09
0.5930691.6070816.318960e-09
0.596181.6069156.502738e-09
0.5993071.606756.687480e-09
0.6024511.6065876.873191e-09
0.6056111.6064267.059876e-09
0.6087881.6062667.247541e-09
0.6119811.6061087.436190e-09
0.6151911.6059527.625828e-09
0.6184181.6057977.816462e-09
0.621.6057227.909900e-09
0.6216621.6056437.931106e-09
0.6249231.6054917.972707e-09
0.6282011.605348.014526e-09
0.6314961.6051918.056565e-09
0.6348091.6050438.098824e-09
0.6381391.6048978.141305e-09
0.6414861.6047528.184008e-09
0.6448511.6046088.226936e-09
0.6482341.6044668.270089e-09
0.6516341.6043258.313468e-09
0.6550521.6041858.357075e-09
0.6584881.6040468.400910e-09
0.661.6039868.420200e-09
0.6619421.6039098.336419e-09
0.6654141.6037738.186629e-09
0.6689051.6036388.036052e-09
0.6724131.6035057.884686e-09
0.6759411.6033727.732526e-09
0.6794861.6032417.579567e-09
0.683051.6031117.425807e-09
0.6866331.6029827.271239e-09
0.6902351.6028557.115861e-09
0.6938561.6027286.959668e-09
0.6974951.6026026.802656e-09
0.71.6025176.694600e-09
0.7011541.6024786.716487e-09
0.7048321.6023546.786249e-09
0.7085291.6022326.856376e-09
0.7122461.6021116.926871e-09
0.7159821.601996.997736e-09
0.7197371.6018717.068972e-09
0.7235131.6017527.140583e-09
0.7273081.6016357.212568e-09
0.7311231.6015197.284932e-09
0.7349581.6014037.357675e-09
0.7388131.6012887.430800e-09
0.7426891.6011757.504308e-09
0.7465841.6010627.578202e-09
0.7505011.600957.652483e-09
0.7544371.6008397.727154e-09
0.7583951.6007297.802217e-09
0.7623731.6006197.877673e-09
0.7663721.6005117.953525e-09
0.7703921.6004038.029775e-09
0.7744331.6002968.106426e-09
0.7784951.600198.183478e-09
0.7825791.6000858.260934e-09
0.7866841.599988.338797e-09
0.790811.5998768.417068e-09
0.7949581.5997738.495749e-09
0.7991281.5996718.574844e-09
0.803321.5995698.654353e-09
0.8075341.5994688.734279e-09
0.811771.5993688.814625e-09
0.8160281.5992688.895392e-09
0.8203081.5991698.976583e-09
0.8246111.5990719.058199e-09
0.8289371.5989749.140244e-09
0.8332851.5988779.222719e-09
0.8376561.598789.305627e-09
0.842051.5986849.388969e-09
0.8464671.5985899.472749e-09
0.8509071.5984949.556968e-09
0.855371.59849.641629e-09
0.8598571.5983079.726734e-09
0.8643671.5982149.812285e-09
0.8689011.5981219.898286e-09
0.8734591.598039.984737e-09
0.8780411.5979381.007164e-08
0.8826471.5978471.015900e-08
0.8872771.5977571.024682e-08
0.8919311.5976671.033510e-08
0.8966091.5975781.042384e-08
0.9013131.5974891.051305e-08
0.906041.59741.060273e-08
0.9107931.5973121.069287e-08
0.9155711.5972241.078349e-08
0.9203731.5971371.087459e-08
0.9252011.597051.096616e-08
0.9300541.5969641.105821e-08
0.9349331.5968781.115075e-08
0.9398371.5967921.124377e-08
0.9447671.5967071.133728e-08
0.9497221.5966221.143128e-08
0.9547041.5965371.152577e-08
0.9597121.5964531.162076e-08
0.9647461.5963691.171625e-08
0.9698071.5962851.181223e-08
0.9748941.5962021.190872e-08
0.9800081.5961191.200572e-08
0.9851481.5960361.210323e-08
0.9903161.5959541.220124e-08
0.995511.5958721.229978e-08
1.000731.595791.239882e-08
1.005981.5957081.249839e-08
1.011261.5956261.259848e-08
1.016561.5955451.269910e-08
1.02191.5954641.280024e-08
1.027261.5953831.290191e-08
1.032641.5953031.300412e-08
1.038061.5952221.310686e-08
1.043511.5951421.321015e-08
1.048981.5950621.331397e-08
1.054481.5949821.341834e-08
1.061.5949031.352300e-08
1.060011.5949031.352442e-08
1.065571.5948231.411836e-08
1.071161.5947441.471540e-08
1.076781.5946641.531558e-08
1.082431.5945851.591891e-08
1.088111.5945061.652540e-08
1.093821.5944271.713507e-08
1.099551.5943481.774795e-08
1.105321.5942691.836403e-08
1.111121.594191.898335e-08
1.116951.5941121.960592e-08
1.122811.5940332.023175e-08
1.12871.5939542.086086e-08
1.134621.5938762.149328e-08
1.140571.5937972.212901e-08
1.146551.5937192.276808e-08
1.152561.593642.341049e-08
1.158611.5935622.405628e-08
1.164691.5934832.470546e-08
1.17081.5934052.535804e-08
1.176941.5933262.601405e-08
1.183111.5932472.667349e-08
1.189321.5931692.733640e-08
1.195561.593092.800278e-08
1.201831.5930112.867266e-08
1.208131.5929322.934605e-08
1.214471.5928533.002297e-08
1.220841.5927743.070344e-08
1.227241.5926953.138749e-08
1.233681.5926163.207512e-08
1.240151.5925363.276636e-08
1.246661.5924573.346122e-08
1.25321.5923773.415973e-08
1.259771.5922973.486191e-08
1.266381.5922173.556776e-08
1.273021.5921373.627732e-08
1.27971.5920573.699060e-08
1.286411.5919763.770763e-08
1.293161.5918953.842841e-08
1.299941.5918143.915298e-08
1.306761.5917333.988134e-08
1.313621.5916524.061353e-08
1.320511.591574.134955e-08
1.327431.5914884.208944e-08
1.33441.5914064.283321e-08
1.34141.5913244.358088e-08
1.348431.5912414.433247e-08
1.355511.5911584.508801e-08
1.362621.5910754.584751e-08
1.369761.5909914.661099e-08
1.376951.5909074.737847e-08
1.384171.5908234.814999e-08
1.391431.5907394.892554e-08
1.398731.5906544.970517e-08
1.406071.5905685.048889e-08
1.413441.5904835.127672e-08
1.420861.5903975.206868e-08
1.428311.590315.286479e-08
1.43581.5902245.366508e-08
1.443331.5901365.446957e-08
1.45091.5900495.527828e-08
1.458521.5899615.609123e-08
1.466171.5898725.690844e-08
1.473861.5897835.772994e-08
1.481591.5896945.855575e-08
1.489361.5896045.938590e-08
1.497171.5895146.022039e-08
1.505031.5894236.105927e-08
1.512921.5893326.190254e-08
1.520861.589246.275024e-08
1.528831.5891476.360238e-08
1.531.5891346.372700e-08
1.536851.5890546.982202e-08
1.544911.5889617.699206e-08
1.553021.5888678.419972e-08
1.561161.5887729.144518e-08
1.569351.5886779.872865e-08
1.577591.5885811.060503e-07
1.585861.5884851.134104e-07
1.594181.5883881.208091e-07
1.602541.588291.282466e-07
1.610951.5881921.357231e-07
1.61941.5880931.432388e-07
1.627891.5879931.507940e-07
1.636431.5878931.583887e-07
1.645021.5877921.660234e-07
1.653641.587691.736980e-07
1.662321.5875881.814130e-07
1.671041.5874851.891683e-07
1.67981.5873811.969644e-07
1.688611.5872762.048014e-07
1.697471.5871712.126795e-07
1.706381.5870642.205989e-07
1.715331.5869572.285598e-07
1.724321.5868492.365625e-07
1.733371.5867412.446072e-07
1.742461.5866312.526941e-07
1.75161.5865212.608233e-07
1.760791.586412.689953e-07
1.770031.5862982.772101e-07
1.779311.5861852.854680e-07
1.788641.5860712.937692e-07
1.798031.5859563.021139e-07
1.807461.585843.105025e-07
1.816941.5857233.189350e-07
1.826471.5856053.274118e-07
1.836051.5854873.359330e-07
1.845681.5853673.444989e-07
1.855361.5852463.531098e-07
1.865091.5851253.617658e-07
1.874881.5850023.704672e-07
1.884711.5848783.792143e-07
1.89461.5847533.880072e-07
1.904541.5846273.968463e-07
1.914531.58454.057318e-07
1.924571.5843724.146638e-07
1.934671.5842424.236427e-07
1.944811.5841114.326687e-07
1.955011.583984.417421e-07
1.965271.5838474.508630e-07
1.971.5837854.550700e-07
1.975581.5837134.816863e-07
1.985941.5835775.311282e-07
1.996361.583445.808294e-07
2.006831.5833026.307913e-07
2.017361.5831636.810153e-07
2.027941.5830237.315028e-07
2.038581.5828817.822550e-07
2.049271.5827378.332735e-07
2.060021.5825938.845596e-07
2.070831.5824479.361148e-07
2.081691.5822999.879403e-07
2.092611.5821511.040038e-06
2.103581.5821.092408e-06
2.114621.5818481.145054e-06
2.125711.5816951.197975e-06
2.136861.581541.251174e-06
2.148071.5813841.304653e-06
2.159341.5812261.358411e-06
2.170661.5810671.412452e-06
2.182051.5809061.466776e-06
2.19351.5807431.521385e-06
2.2051.5805791.576281e-06
2.216571.5804131.631464e-06
2.22821.5802451.686937e-06
2.239881.5800761.742701e-06
2.251631.5799051.798758e-06
2.263441.5797321.855108e-06
2.275321.5795571.911755e-06
2.287251.5793811.968698e-06
2.299251.5792022.025940e-06
2.311311.5790222.083482e-06
2.323431.578842.141326e-06
2.3251.5788162.148800e-06
2.335621.5786562.277326e-06
2.347871.578472.425582e-06
2.360191.5782822.574617e-06
2.372571.5780922.724432e-06
2.385011.57792.875034e-06
2.397521.5777063.026426e-06
2.41011.577513.178612e-06
2.422741.5773113.331596e-06
2.435451.5771113.485382e-06
2.448231.5769083.639975e-06
2.461071.5767043.795379e-06
2.473981.5764963.951599e-06
2.486951.5762874.108638e-06
2.51.5760764.266500e-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
—