Optical constants

Refractive index of N-SSK2 (SCHOTT)

N-SSK2: 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
1.62229
Extinction coefficient k
1.01298e-08
Permittivity ε1
2.63183
Permittivity ε2
3.28669e-08
Absorption coefficient α
0.00216635 cm⁻¹
Penetration depth δ = λ/(2πk)
9.23212e+09 nm
Abbe number Vd
53.274
Chromatic dispersion dn/dλ
-0.0600763 µm⁻¹
Group index ng
1.65759
Group velocity dispersion
108.138 fs²/mm
Dispersion parameter D
-589.952 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-SSK2 (SCHOTT): N-SSK2
schott_n_ssk2 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-SSK2", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_ssk2.range_nm)  # (350, 2500) nm
eps = schott_n_ssk2.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=1.4306027λ2λ2−0.00823982975+0.153150554λ2λ2−0.0333736841+1.01390904λ2λ2−106.870822

Valid from 0.35 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.4306027
C30.00823982975
C40.153150554
C50.0333736841
C61.01390904
C7106.870822

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 5.21e-06 1.34e-08 -1.01e-11 5.21e-07 5.87e-10 0.199
nd
1.62229
Vd
53.27
glass code
622533.353
glass status
standard
density
value: 3525
thermal expansion
value: 5.81e-06, temperature range: 243 343; value: 6.65e-06, temperature range: 293 573
dPgF
-0.0016
resistance
acid: 1.2; stain: 0.0; alkali: 1.0; climatic: 1.0; phosphate: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 3.33e-06 K⁻¹ at 633 nm, dn/dT = 2.71e-06 K⁻¹ at 1310 nm, dn/dT = 2.66e-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 419 wavelengths, the same grid as the API and the library
N-SSK2 (SCHOTT), N-SSK2: n and k versus wavelength
λ (µm)nk
0.351.6562321.544400e-06
0.3517291.6556691.420021e-06
0.3534661.6551131.295027e-06
0.3552121.6545641.169416e-06
0.3569671.6540231.043184e-06
0.358731.6534889.163285e-07
0.3605021.6529617.888465e-07
0.3622831.652446.607349e-07
0.3640731.6519265.319903e-07
0.3651.6516634.652900e-07
0.3658711.6514184.432520e-07
0.3676791.6509173.975377e-07
0.3694951.6504223.515976e-07
0.371.6502863.388200e-07
0.371321.6499343.181757e-07
0.3731541.6494512.894901e-07
0.3749981.6489752.606629e-07
0.376851.6485052.316932e-07
0.3787121.648042.025804e-07
0.381.6477231.824300e-07
0.3805821.6475811.778347e-07
0.3824621.6471281.629979e-07
0.3843521.646681.480877e-07
0.386251.6462381.331039e-07
0.3881581.6458021.180461e-07
0.391.6453871.035100e-07
0.3900761.645371.031811e-07
0.3920021.6449449.478932e-08
0.3939391.6445238.635611e-08
0.3958851.6441077.788124e-08
0.397841.6436966.936451e-08
0.3998061.643296.080571e-08
0.41.643255.995900e-08
0.4017811.6428895.591542e-08
0.4037651.6424935.140817e-08
0.4051.642254.860400e-08
0.405761.6421014.785658e-08
0.4077641.6417144.588469e-08
0.4097781.6413324.390306e-08
0.4118031.6409544.191165e-08
0.4138371.640583.991040e-08
0.4158811.6402113.789926e-08
0.4179351.6398463.587819e-08
0.421.6394853.384713e-08
0.421.6394853.384700e-08
0.4220751.6391293.309380e-08
0.424161.6387773.233684e-08
0.4262551.6384283.157613e-08
0.428361.6380843.081167e-08
0.4304761.6377443.004343e-08
0.4326031.6374072.927139e-08
0.434741.6370752.849554e-08
0.4361.6368812.803800e-08
0.4368871.6367462.781958e-08
0.4390451.6364212.728833e-08
0.4412141.6360992.675444e-08
0.4433941.6357812.621793e-08
0.4455841.6354672.567876e-08
0.4477851.6351572.513693e-08
0.4499971.6348492.459242e-08
0.452221.6345452.404522e-08
0.4544541.6342452.349532e-08
0.4566991.6339482.294270e-08
0.4589551.6336542.238735e-08
0.461.6335192.213000e-08
0.4612221.6333632.184455e-08
0.46351.6330762.131222e-08
0.465791.6327922.077726e-08
0.468091.6325112.023966e-08
0.4704031.6322321.969940e-08
0.4727261.6319571.915647e-08
0.4750621.6316851.861086e-08
0.4774081.6314161.806256e-08
0.4797671.631151.751155e-08
0.4821361.6308871.695781e-08
0.4845181.6306261.640134e-08
0.4869121.6303681.584212e-08
0.4893171.6301131.528014e-08
0.4917341.6298611.471538e-08
0.4941631.6296111.414784e-08
0.4966041.6293641.357749e-08
0.4990571.629121.300432e-08
0.51.6290271.278400e-08
0.5015221.6288781.264923e-08
0.5041.6286391.242992e-08
0.5064891.6284021.220951e-08
0.5089911.6281681.198802e-08
0.5115061.6279361.176543e-08
0.5140321.6277071.154175e-08
0.5165711.627481.131696e-08
0.5191231.6272551.109106e-08
0.5216881.6270331.086404e-08
0.5242651.6268121.063590e-08
0.5268541.6265951.040664e-08
0.5294571.6263791.017624e-08
0.5320721.6261669.944701e-09
0.5347011.6259549.712021e-09
0.5373421.6257459.478192e-09
0.5399961.6255389.243208e-09
0.5426641.6253339.007063e-09
0.5453441.625138.769752e-09
0.5461.6250818.711700e-09
0.5480381.6249298.744214e-09
0.5507451.6247318.787402e-09
0.5534661.6245348.830802e-09
0.55621.6243398.874418e-09
0.5589471.6241468.918248e-09
0.5617081.6239558.962295e-09
0.5644831.6237669.006560e-09
0.5672721.6235789.051043e-09
0.5700741.6233939.095746e-09
0.572891.6232099.140670e-09
0.575721.6230279.185816e-09
0.5785641.6228479.231185e-09
0.581.6227579.254100e-09
0.5814221.6226699.417896e-09
0.5842941.6224929.748825e-09
0.587181.6223171.008139e-08
0.590081.6221431.041559e-08
0.5929951.6219721.075145e-08
0.5959251.6218021.108897e-08
0.5988681.6216331.142815e-08
0.6018271.6214661.176901e-08
0.6047991.6213011.211155e-08
0.6077871.6211371.245579e-08
0.6107891.6209751.280172e-08
0.6138061.6208141.314937e-08
0.6168391.6206551.349873e-08
0.6198861.6204971.384981e-08
0.621.6204911.386300e-08
0.6229481.6203411.377310e-08
0.6260251.6201861.367924e-08
0.6291171.6200321.358492e-08
0.6322251.619881.349014e-08
0.6353481.6197291.339489e-08
0.6384861.619581.329916e-08
0.641641.6194321.320297e-08
0.644811.6192851.310630e-08
0.6479951.6191391.300915e-08
0.6511961.6189951.291152e-08
0.6544131.6188521.281341e-08
0.6576461.6187111.271481e-08
0.661.6186091.264300e-08
0.6608941.618571.256001e-08
0.6641591.6184311.225701e-08
0.667441.6182931.195251e-08
0.6707371.6181561.164651e-08
0.674051.618021.133900e-08
0.677381.6178861.102996e-08
0.6807261.6177521.071940e-08
0.6840881.617621.040731e-08
0.6874671.6174891.009368e-08
0.6908631.6173599.778491e-09
0.6942761.617239.461750e-09
0.6977061.6171029.143444e-09
0.71.6170178.930500e-09
0.7011521.6169758.988653e-09
0.7046161.6168499.163470e-09
0.7080961.6167249.339150e-09
0.7115941.61669.515698e-09
0.7151091.6164789.693118e-09
0.7186421.6163569.871415e-09
0.7221921.6162351.005059e-08
0.7257591.6161151.023065e-08
0.7293441.6159961.041161e-08
0.7329471.6158771.059345e-08
0.7365681.615761.077620e-08
0.7402061.6156441.095984e-08
0.7438621.6155281.114440e-08
0.7475371.6154141.132986e-08
0.751231.61531.151624e-08
0.754941.6151871.170355e-08
0.758671.6150751.189177e-08
0.7624171.6149641.208093e-08
0.7661841.6148531.227102e-08
0.7699681.6147441.246205e-08
0.7737721.6146351.265403e-08
0.7775941.6145261.284695e-08
0.7814351.6144191.304083e-08
0.7852951.6143121.323566e-08
0.7891741.6142071.343145e-08
0.7930731.6141011.362822e-08
0.796991.6139971.382595e-08
0.8009271.6138931.402466e-08
0.8048841.613791.422436e-08
0.808861.6136871.442504e-08
0.8128551.6135861.462671e-08
0.816871.6134851.482938e-08
0.8209061.6133841.503304e-08
0.8249611.6132841.523772e-08
0.8290361.6131851.544340e-08
0.8331311.6130861.565010e-08
0.8372471.6129881.585783e-08
0.8413821.6128911.606658e-08
0.8455391.6127941.627636e-08
0.8497151.6126981.648717e-08
0.8539131.6126021.669903e-08
0.8581311.6125071.691193e-08
0.862371.6124121.712589e-08
0.866631.6123181.734090e-08
0.8709111.6122241.755698e-08
0.8752131.6121311.777412e-08
0.8795361.6120381.799233e-08
0.8838811.6119461.821163e-08
0.8882471.6118551.843200e-08
0.8926351.6117631.865347e-08
0.8970441.6116731.887602e-08
0.9014751.6115821.909968e-08
0.9059281.6114921.932445e-08
0.9104031.6114031.955032e-08
0.9149011.6113141.977731e-08
0.919421.6112252.000542e-08
0.9239621.6111372.023465e-08
0.9285261.6110492.046502e-08
0.9331131.6109612.069653e-08
0.9377221.6108742.092918e-08
0.9423541.6107882.116298e-08
0.9470091.6107012.139794e-08
0.9516871.6106152.163405e-08
0.9563881.6105292.187133e-08
0.9611121.6104442.210979e-08
0.965861.6103592.234942e-08
0.9706311.6102742.259023e-08
0.9754261.610192.283224e-08
0.9802441.6101052.307544e-08
0.9850861.6100212.331984e-08
0.9899531.6099382.356545e-08
0.9948431.6098542.381227e-08
0.9997571.6097712.406032e-08
1.00471.6096882.430958e-08
1.009661.6096062.456008e-08
1.014651.6095232.481182e-08
1.019661.6094412.506480e-08
1.024691.6093592.531902e-08
1.029761.6092772.557451e-08
1.034841.6091952.583126e-08
1.039961.6091142.608927e-08
1.045091.6090332.634856e-08
1.050251.6089512.660913e-08
1.055441.6088712.687099e-08
1.061.60882.710100e-08
1.060661.608792.719365e-08
1.06591.6087092.793298e-08
1.071161.6086292.867597e-08
1.076451.6085482.942263e-08
1.081771.6084683.017297e-08
1.087111.6083883.092702e-08
1.092481.6083083.168480e-08
1.097881.6082283.244632e-08
1.10331.6081483.321160e-08
1.108751.6080683.398066e-08
1.114231.6079883.475352e-08
1.119731.6079083.553020e-08
1.125271.6078293.631071e-08
1.130821.6077493.709508e-08
1.136411.6076693.788332e-08
1.142021.607593.867546e-08
1.147671.607513.947151e-08
1.153331.6074314.027150e-08
1.159031.6073514.107543e-08
1.164761.6072714.188334e-08
1.170511.6071924.269524e-08
1.176291.6071124.351114e-08
1.18211.6070334.433108e-08
1.187941.6069534.515507e-08
1.193811.6068734.598313e-08
1.199711.6067934.681528e-08
1.205631.6067134.765154e-08
1.211591.6066334.849193e-08
1.217571.6065534.933647e-08
1.223591.6064735.018519e-08
1.229631.6063935.103809e-08
1.235711.6063135.189521e-08
1.241811.6062325.275657e-08
1.247951.6061525.362217e-08
1.254111.6060715.449206e-08
1.260311.605995.536624e-08
1.266531.6059095.624474e-08
1.272791.6058285.712758e-08
1.279071.6057465.801478e-08
1.285391.6056655.890636e-08
1.291741.6055835.980235e-08
1.298121.6055016.070276e-08
1.304541.6054196.160762e-08
1.310981.6053376.251695e-08
1.317461.6052546.343078e-08
1.323961.6051716.434911e-08
1.33051.6050886.527199e-08
1.337081.6050056.619942e-08
1.343681.6049226.713143e-08
1.350321.6048386.806805e-08
1.356991.6047546.900929e-08
1.363691.6046696.995518e-08
1.370431.6045857.090575e-08
1.37721.60457.186101e-08
1.3841.6044147.282099e-08
1.390841.6043297.378571e-08
1.397711.6042437.475520e-08
1.404611.6041577.572948e-08
1.411551.604077.670857e-08
1.418521.6039837.769249e-08
1.425531.6038967.868128e-08
1.432571.6038087.967495e-08
1.439651.603728.067353e-08
1.446761.6036328.167704e-08
1.453911.6035438.268551e-08
1.461091.6034538.369896e-08
1.468311.6033648.471741e-08
1.475561.6032748.574090e-08
1.482851.6031838.676944e-08
1.490171.6030928.780307e-08
1.497531.6038.884180e-08
1.504931.6029088.988566e-08
1.512371.6028169.093468e-08
1.519841.6027239.198888e-08
1.527341.602639.304828e-08
1.531.6025979.342300e-08
1.534891.6025369.744158e-08
1.542471.6024411.036734e-07
1.550091.6023461.099360e-07
1.557751.6022511.162296e-07
1.565441.6021541.225542e-07
1.573181.6020581.289101e-07
1.580951.6019611.352973e-07
1.588761.6018631.417162e-07
1.59661.6017641.481667e-07
1.604491.6016651.546491e-07
1.612421.6015661.611635e-07
1.620381.6014651.677101e-07
1.628391.6013641.742890e-07
1.636431.6012631.809005e-07
1.644511.6011611.875446e-07
1.652641.6010581.942215e-07
1.66081.6009542.009314e-07
1.6691.600852.076744e-07
1.677251.6007452.144508e-07
1.685531.6006392.212606e-07
1.693861.6005332.281040e-07
1.702231.6004252.349813e-07
1.710641.6003172.418925e-07
1.719091.6002092.488379e-07
1.727581.6000992.558176e-07
1.736111.5999892.628318e-07
1.744691.5998782.698806e-07
1.753311.5997662.769642e-07
1.761971.5996532.840828e-07
1.770671.5995392.912366e-07
1.779421.5994252.984258e-07
1.788211.599313.056504e-07
1.797041.5991933.129107e-07
1.805921.5990763.202069e-07
1.814841.5989583.275391e-07
1.82381.5988393.349076e-07
1.832811.5987193.423124e-07
1.841871.5985993.497539e-07
1.850961.5984773.572321e-07
1.860111.5983543.647472e-07
1.86931.598233.722994e-07
1.878531.5981053.798890e-07
1.887811.597983.875160e-07
1.897141.5978533.951808e-07
1.906511.5977254.028834e-07
1.915921.5975964.106240e-07
1.925391.5974664.184029e-07
1.93491.5973354.262202e-07
1.944461.5972024.340761e-07
1.954061.5970694.419708e-07
1.963721.5969344.499045e-07
1.971.5968474.550700e-07
1.973421.5967994.740835e-07
1.983161.5966625.283475e-07
1.992961.5965245.828795e-07
2.00281.5963846.376809e-07
2.01271.5962446.927530e-07
2.022641.5961027.480972e-07
2.032631.5959598.037148e-07
2.042671.5958158.596070e-07
2.052761.5956699.157754e-07
2.06291.5955229.722213e-07
2.073091.5953741.028946e-06
2.083331.5952241.085951e-06
2.093631.5950731.143237e-06
2.103971.5949211.200807e-06
2.114361.5947671.258661e-06
2.12481.5946121.316800e-06
2.13531.5944551.375227e-06
2.145851.5942971.433942e-06
2.156451.5941381.492948e-06
2.16711.5939761.552245e-06
2.177811.5938141.611835e-06
2.188561.593651.671719e-06
2.199371.5934841.731899e-06
2.210241.5933161.792376e-06
2.221161.5931471.853152e-06
2.232131.5929771.914229e-06
2.243161.5928051.975606e-06
2.254241.5926312.037288e-06
2.265371.5924552.099273e-06
2.276561.5922782.161566e-06
2.287811.5920992.224165e-06
2.299111.5919182.287074e-06
2.310471.5917352.350294e-06
2.321881.5915512.413826e-06
2.3251.59152.431200e-06
2.333351.5913642.578356e-06
2.344871.5911762.781526e-06
2.356461.5909862.985700e-06
2.36811.5907943.190883e-06
2.37981.59063.397079e-06
2.391551.5904043.604294e-06
2.403371.5902063.812532e-06
2.415241.5900064.021799e-06
2.427171.5898044.232100e-06
2.439161.58964.443439e-06
2.451211.5893944.655823e-06
2.463311.5891864.869255e-06
2.475481.5889765.083742e-06
2.487711.5887635.299289e-06
2.51.5885485.515900e-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
—