Optical constants

Refractive index of N-KZFS8 (SCHOTT)

N-KZFS8: 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
1.72047
Extinction coefficient k
9.37538e-09
Permittivity ε1
2.96
Permittivity ε2
3.22600e-08
Absorption coefficient α
0.00200501 cm⁻¹
Penetration depth δ = λ/(2πk)
9.97501e+09 nm
Abbe number Vd
34.7
Chromatic dispersion dn/dλ
-0.10531 µm⁻¹
Group index ng
1.78235
Group velocity dispersion
203.942 fs²/mm
Dispersion parameter D
-1112.61 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-KZFS8 (SCHOTT): N-KZFS8
schott_n_kzfs8 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-KZFS8", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_kzfs8.range_nm)  # (334, 2500) nm
eps = schott_n_kzfs8.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=1.62693651λ2λ2−0.010880863+0.24369876λ2λ2−0.0494207753+1.62007141λ2λ2−131.009163

Valid from 0.334 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.62693651
C30.010880863
C40.24369876
C50.0494207753
C61.62007141
C7131.009163

Comments and conditions

suitable for precision molding. step 0.5 available

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 7.93e-07 6.47e-09 -5e-12 7.71e-07 1.01e-09 0.254
nd
1.72047
Vd
34.7
glass code
720347.320
glass status
standard
density
value: 3204
thermal expansion
value: 7.77e-06, temperature range: 243 343; value: 9.43e-06, temperature range: 293 573
dPgF
-0.0021
resistance
acid: 1.0; 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 = 1.75e-06 K⁻¹ at 633 nm, dn/dT = 6.94e-07 K⁻¹ at 1310 nm, dn/dT = 6.16e-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-KZFS8 (SCHOTT), N-KZFS8: n and k versus wavelength
λ (µm)nk
0.3341.7997014.896000e-06
0.3356891.7981914.499260e-06
0.3373871.796714.100513e-06
0.3390931.7952593.699749e-06
0.3408081.7938363.296958e-06
0.3425321.792442.892130e-06
0.3442641.7910712.485255e-06
0.3460061.7897272.076322e-06
0.3477561.7884091.665321e-06
0.3495141.7871151.252241e-06
0.351.7867631.138200e-06
0.3512821.7858441.079210e-06
0.3530591.7845979.974687e-07
0.3548441.7833729.153139e-07
0.3566391.7821688.327436e-07
0.3584431.7809867.497556e-07
0.3602561.7798256.663480e-07
0.3620781.7786845.825185e-07
0.3639091.7775624.982650e-07
0.3651.7769064.480700e-07
0.365751.776464.340629e-07
0.3675991.7753763.994934e-07
0.3694591.774313.647491e-07
0.371.7740043.546300e-07
0.3713271.7732623.394227e-07
0.3732051.7722323.179023e-07
0.3750931.7712182.962731e-07
0.376991.7702212.745345e-07
0.3788961.769242.526860e-07
0.381.7686822.400400e-07
0.3808131.7682752.345817e-07
0.3827391.7673252.216466e-07
0.3846741.7663912.086462e-07
0.386621.765471.955799e-07
0.3885751.7645651.824476e-07
0.391.7639171.728800e-07
0.3905411.7636731.700253e-07
0.3925161.7627951.595962e-07
0.3945011.7619311.491143e-07
0.3964961.761081.385795e-07
0.3985021.7602411.279914e-07
0.41.7596261.200800e-07
0.4005171.7594161.187779e-07
0.4025431.7586021.136773e-07
0.4045791.7578011.085509e-07
0.4051.7576371.074900e-07
0.4066251.7570111.048069e-07
0.4086811.7562341.014110e-07
0.4107481.7554679.799786e-08
0.4128261.7547129.456750e-08
0.4149141.7539679.111980e-08
0.4170121.7532348.765465e-08
0.4191211.752518.417198e-08
0.421.7522138.272100e-08
0.4212411.7517978.126122e-08
0.4233721.7510947.875524e-08
0.4255131.7504017.623659e-08
0.4276651.7497187.370521e-08
0.4298281.7490447.116102e-08
0.4320021.748386.860396e-08
0.4341871.7477256.603397e-08
0.4361.747196.390100e-08
0.4363831.7470786.356925e-08
0.438591.7464416.165545e-08
0.4408081.7458125.973198e-08
0.4430371.7451925.779878e-08
0.4452781.744585.585580e-08
0.447531.7439765.390299e-08
0.4497941.743385.194031e-08
0.4520681.7427934.996770e-08
0.4543551.7422134.798511e-08
0.4566531.741644.599250e-08
0.4589621.7410754.398980e-08
0.461.7408254.309000e-08
0.4612841.7405184.247915e-08
0.4636171.7399684.136887e-08
0.4659611.7394254.025299e-08
0.4683181.7388893.913145e-08
0.4706871.7383593.800425e-08
0.4730671.7378373.687134e-08
0.475461.7373213.573271e-08
0.4778641.7368123.458831e-08
0.4802811.7363093.343813e-08
0.482711.7358133.228213e-08
0.4851521.7353223.112028e-08
0.4876051.7348382.995256e-08
0.4900721.734362.877893e-08
0.492551.7338882.759937e-08
0.4950411.7334222.641384e-08
0.4975451.7329612.522231e-08
0.51.7325172.405400e-08
0.5000611.7325062.403818e-08
0.5025911.7320562.338693e-08
0.5051321.7316122.273239e-08
0.5076871.7311742.207453e-08
0.5102551.7307412.141335e-08
0.5128361.7303122.074883e-08
0.5154291.7298892.008095e-08
0.5180361.7294721.940968e-08
0.5206561.7290591.873502e-08
0.5232891.7286511.805695e-08
0.5259361.7282471.737545e-08
0.5285961.7278491.669051e-08
0.531271.7274551.600210e-08
0.5339561.7270661.531021e-08
0.5366571.7266811.461481e-08
0.5393711.7263011.391591e-08
0.5420991.7259251.321346e-08
0.5448411.7255531.250747e-08
0.5461.7253981.220900e-08
0.5475971.7251861.207025e-08
0.5503661.7248231.182955e-08
0.553151.7244641.158764e-08
0.5559471.7241091.134450e-08
0.5587591.7237581.110013e-08
0.5615851.7234121.085453e-08
0.5644251.7230691.060768e-08
0.567281.7227291.035959e-08
0.5701491.7223941.011024e-08
0.5730331.7220629.859630e-09
0.5759311.7217349.607752e-09
0.5788441.721419.354600e-09
0.581.7212839.254100e-09
0.5817711.7210899.282364e-09
0.5847141.7207729.329317e-09
0.5876711.7204589.376507e-09
0.5906431.7201489.423936e-09
0.593631.7198419.471605e-09
0.5966331.7195379.519515e-09
0.599651.7192379.567668e-09
0.6026831.7189399.616064e-09
0.6057311.7186459.664705e-09
0.6087951.7183549.713591e-09
0.6118741.7180679.762725e-09
0.6149681.7177829.812108e-09
0.6180791.71759.861740e-09
0.621.7173289.892400e-09
0.6212051.7172219.911632e-09
0.6243461.7169459.961791e-09
0.6275041.7166721.001220e-08
0.6306781.7164021.006287e-08
0.6338681.7161341.011380e-08
0.6370731.7158691.016498e-08
0.6402961.7156071.021642e-08
0.6435341.7153481.026812e-08
0.6467891.7150911.032008e-08
0.650061.7148371.037231e-08
0.6533481.7145861.042479e-08
0.6566521.7143371.047755e-08
0.6599731.714091.053057e-08
0.661.7140881.053100e-08
0.6633111.7138461.039852e-08
0.6666661.7136041.026429e-08
0.6700381.7133651.012937e-08
0.6734261.7131289.993780e-09
0.6768321.7128939.857500e-09
0.6802551.7126619.720530e-09
0.6836961.7124319.582868e-09
0.6871541.7122039.444510e-09
0.6906291.7119779.305452e-09
0.6941221.7117549.165691e-09
0.6976331.7115329.025223e-09
0.71.7113858.930500e-09
0.7011611.7113138.912586e-09
0.7047071.7110958.857869e-09
0.7082711.710888.802875e-09
0.7118541.7106678.747603e-09
0.7154541.7104568.692052e-09
0.7190721.7102468.636219e-09
0.7227091.7100398.580104e-09
0.7263641.7098338.523706e-09
0.7300381.709638.467022e-09
0.733731.7094288.410052e-09
0.7374411.7092288.352793e-09
0.7411711.7090298.295245e-09
0.7449191.7088338.237406e-09
0.7486871.7086388.179274e-09
0.7524741.7084458.120848e-09
0.7562791.7082548.062127e-09
0.7601041.7080648.003108e-09
0.7639491.7078767.943792e-09
0.7678121.7076897.884175e-09
0.7716961.7075047.824256e-09
0.7755991.7073217.764035e-09
0.7795211.7071397.703509e-09
0.7834641.7069597.642677e-09
0.7874261.706787.581537e-09
0.7914091.7066037.520089e-09
0.7954111.7064277.458329e-09
0.7994341.7062527.396257e-09
0.8034781.7060797.333871e-09
0.8075411.7059077.271169e-09
0.8116251.7057377.208151e-09
0.815731.7055687.144813e-09
0.8198561.70547.081155e-09
0.8240031.7052347.017176e-09
0.828171.7050696.952873e-09
0.8323591.7049056.888244e-09
0.8365681.7047426.823289e-09
0.8407991.7045816.758005e-09
0.8450521.704426.692391e-09
0.8493261.7042616.626445e-09
0.8536211.7041036.560165e-09
0.8579391.7039466.493551e-09
0.8622781.7037916.426599e-09
0.8666391.7036366.359309e-09
0.8710221.7034826.291679e-09
0.8754271.703336.223706e-09
0.8798551.7031786.155390e-09
0.8843051.7030286.086728e-09
0.8887771.7028796.017719e-09
0.8932721.702735.948361e-09
0.897791.7025835.878652e-09
0.9023311.7024365.808590e-09
0.9068951.702295.738174e-09
0.9114811.7021465.667402e-09
0.9160911.7020025.596273e-09
0.9207241.7018595.524783e-09
0.9253811.7017175.452932e-09
0.9300611.7015765.380717e-09
0.9347651.7014355.308137e-09
0.9394931.7012965.235190e-09
0.9442451.7011575.161874e-09
0.949021.7010195.088188e-09
0.953821.7008825.014128e-09
0.9586441.7007454.939695e-09
0.9634921.7006094.864884e-09
0.9683651.7004744.789695e-09
0.9732631.700344.714126e-09
0.9781851.7002064.638175e-09
0.9831331.7000734.561840e-09
0.9881051.6999414.485118e-09
0.9931031.6998094.408009e-09
0.9981251.6996784.330510e-09
1.003171.6995484.252618e-09
1.008251.6994184.174333e-09
1.013351.6992894.095652e-09
1.018471.699164.016572e-09
1.023621.6990323.937093e-09
1.02881.6989043.857212e-09
1.0341.6987773.776927e-09
1.039231.698653.696236e-09
1.044491.6985243.615136e-09
1.049771.6983993.533627e-09
1.055081.6982733.451705e-09
1.061.6981583.375800e-09
1.060421.6981493.446856e-09
1.065781.6980244.361202e-09
1.071171.69795.280172e-09
1.076591.6977776.203790e-09
1.082031.6976547.132080e-09
1.087511.6975318.065064e-09
1.093011.6974099.002767e-09
1.098531.6972879.945212e-09
1.104091.6971651.089242e-08
1.109671.6970441.184443e-08
1.115291.6969231.280124e-08
1.120931.6968021.376290e-08
1.12661.6966821.472942e-08
1.132291.6965611.570083e-08
1.138021.6964411.667715e-08
1.143781.6963221.765841e-08
1.149561.6962021.864463e-08
1.155371.6960831.963584e-08
1.161221.6959642.063207e-08
1.167091.6958452.163333e-08
1.172991.6957262.263966e-08
1.178931.6956082.365107e-08
1.184891.6954892.466760e-08
1.190881.6953712.568927e-08
1.19691.6952532.671611e-08
1.202961.6951352.774815e-08
1.209041.6950172.878540e-08
1.215161.6948992.982790e-08
1.22131.6947823.087567e-08
1.227481.6946643.192874e-08
1.233691.6945463.298714e-08
1.239931.6944293.405089e-08
1.24621.6943113.512001e-08
1.25251.6941933.619455e-08
1.258841.6940763.727452e-08
1.26521.6939583.835996e-08
1.27161.693843.945088e-08
1.278031.6937234.054732e-08
1.28451.6936054.164930e-08
1.290991.6934874.275686e-08
1.297521.6933694.387002e-08
1.304091.6932514.498882e-08
1.310681.6931334.611327e-08
1.317311.6930144.724340e-08
1.323971.6928964.837925e-08
1.330671.6927774.952085e-08
1.33741.6926595.066822e-08
1.344161.692545.182139e-08
1.350961.6924215.298040e-08
1.357791.6923015.414527e-08
1.364661.6921825.531603e-08
1.371561.6920625.649271e-08
1.37851.6919425.767534e-08
1.385471.6918225.886395e-08
1.392481.6917016.005858e-08
1.399521.691586.125924e-08
1.40661.6914596.246598e-08
1.413711.6913386.367882e-08
1.420861.6912166.489780e-08
1.428051.6910946.612294e-08
1.435271.6909716.735428e-08
1.442531.6908486.859184e-08
1.449831.6907256.983567e-08
1.457161.6906017.108578e-08
1.464531.6904777.234222e-08
1.471941.6903537.360501e-08
1.479381.6902287.487419e-08
1.486861.6901037.614979e-08
1.494381.6899777.743184e-08
1.501941.6898517.872038e-08
1.509541.6897248.001543e-08
1.517171.6895968.131703e-08
1.524851.6894698.262521e-08
1.531.6893838.350400e-08
1.532561.689348.605772e-08
1.540311.6892119.379747e-08
1.54811.6890821.015764e-07
1.555931.6889521.093946e-07
1.56381.6888211.172524e-07
1.571711.688691.251499e-07
1.579661.6885581.330874e-07
1.587651.6884261.410650e-07
1.595681.6882921.490829e-07
1.603751.6881591.571414e-07
1.611861.6880241.652407e-07
1.620011.6878891.733809e-07
1.62821.6877531.815623e-07
1.636441.6876161.897851e-07
1.644711.6874791.980495e-07
1.653031.6873412.063556e-07
1.661391.6872022.147038e-07
1.669791.6870622.230942e-07
1.678241.6869212.315270e-07
1.686731.686782.400025e-07
1.695261.6866382.485209e-07
1.703831.6864952.570823e-07
1.712451.6863512.656870e-07
1.721111.6862062.743353e-07
1.729821.686062.830273e-07
1.738561.6859132.917632e-07
1.747361.6857663.005433e-07
1.756191.6856173.093679e-07
1.765081.6854673.182370e-07
1.7741.6853173.271511e-07
1.782981.6851653.361102e-07
1.791991.6850133.451146e-07
1.801061.6848593.541646e-07
1.810171.6847043.632603e-07
1.819321.6845483.724020e-07
1.828521.6843913.815900e-07
1.837771.6842333.908244e-07
1.847071.6840744.001056e-07
1.856411.6839144.094337e-07
1.86581.6837524.188089e-07
1.875231.683594.282316e-07
1.884721.6834264.377020e-07
1.894251.6832614.472202e-07
1.903831.6830944.567866e-07
1.913461.6829264.664013e-07
1.923141.6827574.760647e-07
1.932861.6825874.857770e-07
1.942641.6824154.955383e-07
1.952461.6822425.053491e-07
1.962341.6820685.152095e-07
1.971.6819325.228600e-07
1.972261.6818925.363535e-07
1.982241.6817155.958307e-07
1.992261.6815366.556087e-07
2.002341.6813567.156890e-07
2.012471.6811757.760732e-07
2.022641.6809918.367628e-07
2.032871.6808078.977593e-07
2.043161.6806219.590643e-07
2.053491.6804331.020679e-06
2.063881.6802431.082606e-06
2.074311.6800521.144846e-06
2.08481.679861.207401e-06
2.095351.6796651.270272e-06
2.105951.6794691.333461e-06
2.11661.6792721.396970e-06
2.12731.6790721.460799e-06
2.138061.6788711.524952e-06
2.148881.6786681.589429e-06
2.159741.6784631.654232e-06
2.170671.6782561.719363e-06
2.181641.6780481.784824e-06
2.192681.6778371.850615e-06
2.203771.6776251.916739e-06
2.214911.677411.983198e-06
2.226121.6771942.049993e-06
2.237381.6769762.117125e-06
2.248691.6767552.184598e-06
2.260061.6765332.252411e-06
2.271491.6763082.320567e-06
2.282981.6760812.389068e-06
2.294531.6758532.457916e-06
2.306131.6756222.527112e-06
2.31781.6753882.596657e-06
2.3251.6752442.639600e-06
2.329521.6751532.709829e-06
2.34131.6749152.892865e-06
2.353141.6746753.076826e-06
2.365051.6744333.261718e-06
2.377011.6741883.447546e-06
2.389031.6739413.634312e-06
2.401111.6736913.822024e-06
2.413261.6734394.010685e-06
2.425461.6731844.200300e-06
2.437731.6729274.390874e-06
2.450061.6726684.582412e-06
2.462451.6724054.774919e-06
2.47491.672144.968399e-06
2.487421.6718735.162858e-06
2.51.6716035.358300e-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
—