Optical constants

Refractive index of SFL6 (SCHOTT)

SFL6: n,k 0.37–2.325 µm

Data
formula 2 + tabulated k
Range
0.37–2.325 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.37–2.325 µm
Refractive index n
1.80518
Extinction coefficient k
3.66406e-08
Permittivity ε1
3.25866
Permittivity ε2
1.32285e-07
Absorption coefficient α
0.00783593 cm⁻¹
Penetration depth δ = λ/(2πk)
2.55234e+09 nm
Abbe number Vd
25.394
Chromatic dispersion dn/dλ
-0.158569 µm⁻¹
Group index ng
1.89835
Group velocity dispersion
328.102 fs²/mm
Dispersion parameter D
-1789.97 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

# SFL6 (SCHOTT): SFL6
schott_sfl6 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "SFL6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_sfl6.range_nm)  # (370, 2325) nm
eps = schott_sfl6.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=1.78922056λ2λ2−0.0135163537+0.328427448λ2λ2−0.0622729599+2.01639441λ2λ2−168.014713

Valid from 0.37 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.78922056
C30.0135163537
C40.328427448
C50.0622729599
C62.01639441
C7168.014713

Comments and conditions

inquiry glass

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -5.26e-06 7.41e-09 -1.89e-11 1.02e-06 1.62e-09 0.288
nd
1.80518
Vd
25.39
glass code
805254.337
glass status
special
density
value: 3370
thermal expansion
value: 9e-06, temperature range: 243 343; value: 1.03e-05, temperature range: 293 573
dPgF
0.0148
resistance
acid: 2.0; 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 = -1.27e-06 K⁻¹ at 633 nm, dn/dT = -2.78e-06 K⁻¹ at 1310 nm, dn/dT = -2.88e-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 416 wavelengths, the same grid as the API and the library
SFL6 (SCHOTT), SFL6: n and k versus wavelength
λ (µm)nk
0.371.8936914.607400e-06
0.3717081.8919524.106761e-06
0.3734251.8902473.603810e-06
0.3751491.8885733.098537e-06
0.3768811.8869312.590931e-06
0.3786211.885322.080981e-06
0.381.8840691.676800e-06
0.3803691.8837381.644886e-06
0.3821251.8821861.492974e-06
0.3838891.8806611.340360e-06
0.3856621.8791631.187042e-06
0.3874431.8776921.033016e-06
0.3892311.8762478.782782e-07
0.391.8756368.117900e-07
0.3910281.8748277.807415e-07
0.3928341.8734327.262381e-07
0.3946481.872066.714830e-07
0.396471.8707126.164752e-07
0.39831.8693875.612133e-07
0.41.8681815.099000e-07
0.4001391.8680835.074935e-07
0.4019871.8668014.755655e-07
0.4038431.865544.434901e-07
0.4051.8647674.234900e-07
0.4057071.86434.168047e-07
0.407581.863083.990994e-07
0.4094621.8618793.813123e-07
0.4113531.8606973.634432e-07
0.4132521.8595353.454915e-07
0.415161.858393.274569e-07
0.4170771.8572633.093391e-07
0.4190031.8561542.911376e-07
0.421.8555882.817100e-07
0.4209371.8550612.774700e-07
0.4228811.8539862.686769e-07
0.4248331.8529262.598432e-07
0.4267951.8518832.509687e-07
0.4287651.8508552.420532e-07
0.4307451.8498432.330966e-07
0.4327341.8488452.240986e-07
0.4347321.8478622.150591e-07
0.4361.8472482.093200e-07
0.4367391.8468932.076256e-07
0.4387551.8459392.030003e-07
0.4407811.8449981.983537e-07
0.4428161.8440711.936857e-07
0.4448611.8431561.889961e-07
0.4469151.8422551.842848e-07
0.4489781.8413671.795518e-07
0.4510511.840491.747970e-07
0.4531331.8396261.700202e-07
0.4552261.8387741.652213e-07
0.4573271.8379341.604003e-07
0.4594391.8371051.555570e-07
0.461.8368881.542700e-07
0.461561.8362881.520939e-07
0.4636911.8354811.491215e-07
0.4658321.8346861.461353e-07
0.4679831.8339011.431354e-07
0.4701441.8331261.401217e-07
0.4723141.8323621.370940e-07
0.4744951.8316081.340523e-07
0.4766861.8308641.309966e-07
0.4788871.8301291.279268e-07
0.4810981.8294041.248429e-07
0.4833191.8286891.217446e-07
0.4855511.8279831.186321e-07
0.4877921.8272851.155052e-07
0.4900451.8265971.123639e-07
0.4923071.8259171.092081e-07
0.494581.8252461.060376e-07
0.4968641.8245841.028526e-07
0.4991581.823939.965286e-08
0.51.8236929.847800e-08
0.5014621.8232849.703026e-08
0.5037781.8226469.473807e-08
0.5061041.8220159.243530e-08
0.508441.8213939.012190e-08
0.5107881.8207788.779782e-08
0.5131461.8201718.546301e-08
0.5155151.8195718.311741e-08
0.5178961.8189798.076099e-08
0.5202871.8183937.839369e-08
0.5226891.8178157.601546e-08
0.5251021.8172447.362625e-08
0.5275271.8166797.122600e-08
0.5299621.8161216.881468e-08
0.5324091.815576.639222e-08
0.5348671.8150256.395857e-08
0.5373371.8144876.151369e-08
0.5398181.8139555.905753e-08
0.542311.8134295.659002e-08
0.5448141.8129095.411112e-08
0.5461.8126665.293700e-08
0.5473291.8123955.232547e-08
0.5498571.8118885.116310e-08
0.5523951.8113864.999536e-08
0.5549461.8108894.882223e-08
0.5575081.8103994.764368e-08
0.5600821.8099144.645969e-08
0.5626681.8094344.527023e-08
0.5652661.808964.407528e-08
0.5678761.8084924.287482e-08
0.5704981.8080284.166881e-08
0.5731321.807574.045724e-08
0.5757781.8071173.924007e-08
0.5784361.8066683.801728e-08
0.581.8064083.729800e-08
0.5811071.8062253.720225e-08
0.583791.8057873.697017e-08
0.5864851.8053533.673702e-08
0.5891931.8049253.650279e-08
0.5919141.80453.626748e-08
0.5946461.8040813.603108e-08
0.5973921.8036663.579359e-08
0.600151.8032553.555501e-08
0.6029211.8028493.531532e-08
0.6057051.8024483.507453e-08
0.6085011.802053.483263e-08
0.6113111.8016573.458960e-08
0.6141331.8012683.434546e-08
0.6169691.8008833.410019e-08
0.6198171.8005023.385379e-08
0.621.8004783.383800e-08
0.6226791.8001253.327034e-08
0.6255541.7997523.266121e-08
0.6284421.7993833.204926e-08
0.6313441.7990183.143449e-08
0.6342591.7986573.081689e-08
0.6371871.7982993.019643e-08
0.6401291.7979452.957310e-08
0.6430851.7975952.894690e-08
0.6460541.7972482.831781e-08
0.6490371.7969052.768581e-08
0.6520341.7965652.705090e-08
0.6550441.7962282.641305e-08
0.6580681.7958962.577226e-08
0.661.7956852.536300e-08
0.6611071.7955662.534316e-08
0.6641591.795242.528845e-08
0.6672261.7949172.523348e-08
0.6703061.7945972.517826e-08
0.6734011.794282.512279e-08
0.676511.7939672.506705e-08
0.6796341.7936562.501107e-08
0.6827721.7933492.495482e-08
0.6859241.7930442.489831e-08
0.6890911.7927432.484154e-08
0.6922731.7924442.478451e-08
0.6954691.7921492.472722e-08
0.698681.7918562.466966e-08
0.71.7917372.464600e-08
0.7019061.7915662.473117e-08
0.7051461.7912792.487599e-08
0.7084021.7909942.502149e-08
0.7116731.7907132.516765e-08
0.7149591.7904332.531449e-08
0.718261.7901572.546201e-08
0.7215761.7898832.561021e-08
0.7249081.7896122.575909e-08
0.7282551.7893432.590867e-08
0.7316171.7890772.605893e-08
0.7349951.7888132.620988e-08
0.7383881.7885512.636154e-08
0.7417981.7882922.651389e-08
0.7452231.7880362.666695e-08
0.7486631.7877812.682071e-08
0.752121.7875292.697518e-08
0.7555931.787282.713037e-08
0.7590811.7870322.728627e-08
0.7625861.7867872.744289e-08
0.7661071.7865442.760024e-08
0.7696441.7863032.775831e-08
0.7731971.7860642.791711e-08
0.7767671.7858272.807665e-08
0.7803541.7855922.823692e-08
0.7839571.785362.839793e-08
0.7875761.7851292.855969e-08
0.7912131.78492.872219e-08
0.7948661.7846742.888544e-08
0.7985361.7844492.904945e-08
0.8022231.7842262.921421e-08
0.8059261.7840052.937974e-08
0.8096481.7837862.954603e-08
0.8133861.7835692.971308e-08
0.8171411.7833532.988091e-08
0.8209141.783143.004951e-08
0.8247041.7829283.021889e-08
0.8285121.7827183.038905e-08
0.8323371.7825093.056000e-08
0.836181.7823023.073174e-08
0.8400411.7820973.090427e-08
0.8439191.7818943.107760e-08
0.8478161.7816923.125173e-08
0.851731.7814923.142666e-08
0.8556631.7812933.160240e-08
0.8596131.7810963.177895e-08
0.8635821.7809013.195631e-08
0.867571.7807063.213450e-08
0.8715751.7805143.231350e-08
0.8755991.7803233.249334e-08
0.8796421.7801333.267400e-08
0.8837031.7799453.285550e-08
0.8877841.7797583.303784e-08
0.8918821.7795733.322101e-08
0.8961.7793893.340504e-08
0.9001371.7792063.358991e-08
0.9042931.7790253.377564e-08
0.9084681.7788453.396222e-08
0.9126631.7786663.414967e-08
0.9168771.7784883.433798e-08
0.921111.7783123.452716e-08
0.9253631.7781373.471722e-08
0.9296351.7779633.490815e-08
0.9339281.7777913.509996e-08
0.938241.7776193.529266e-08
0.9425711.7774493.548625e-08
0.9469231.777283.568073e-08
0.9512951.7771123.587611e-08
0.9556881.7769453.607239e-08
0.96011.7767793.626958e-08
0.9645331.7766153.646768e-08
0.9689861.7764513.666670e-08
0.973461.7762893.686663e-08
0.9779551.7761273.706748e-08
0.982471.7759663.726927e-08
0.9870061.7758073.747198e-08
0.9915631.7756483.767563e-08
0.9961411.7754913.788022e-08
1.000741.7753343.808576e-08
1.005361.7751783.829224e-08
1.011.7750243.849968e-08
1.014671.774873.870808e-08
1.019351.7747173.891744e-08
1.024061.7745643.912776e-08
1.028791.7744133.933906e-08
1.033541.7742633.955133e-08
1.038311.7741133.976458e-08
1.04311.7739643.997882e-08
1.047921.7738164.019404e-08
1.052761.7736694.041026e-08
1.057621.7735224.062748e-08
1.061.7734514.073400e-08
1.06251.7733774.064720e-08
1.067411.7732324.047684e-08
1.072331.7730874.030569e-08
1.077281.7729444.013375e-08
1.082261.7728013.996102e-08
1.087261.7726593.978749e-08
1.092281.7725173.961316e-08
1.097321.7723763.943803e-08
1.102381.7722363.926208e-08
1.107471.7720963.908533e-08
1.112591.7719573.890775e-08
1.117721.7718193.872936e-08
1.122891.7716813.855014e-08
1.128071.7715443.837010e-08
1.133281.7714073.818923e-08
1.138511.7712713.800752e-08
1.143771.7711353.782497e-08
1.149051.7713.764158e-08
1.154351.7708653.745734e-08
1.159681.7707313.727225e-08
1.165041.7705973.708630e-08
1.170421.7704643.689950e-08
1.175821.7703313.671184e-08
1.181251.7701993.652331e-08
1.18671.7700673.633390e-08
1.192181.7699363.614363e-08
1.197691.7698053.595247e-08
1.203221.7696743.576044e-08
1.208771.7695443.556751e-08
1.214351.7694143.537370e-08
1.219961.7692843.517899e-08
1.225591.7691553.498338e-08
1.231251.7690263.478687e-08
1.236941.7688983.458945e-08
1.242651.7687693.439112e-08
1.248381.7686413.419187e-08
1.254151.7685143.399171e-08
1.259941.7683863.379062e-08
1.265761.7682593.358860e-08
1.27161.7681323.338565e-08
1.277471.7680053.318176e-08
1.283371.7678793.297693e-08
1.289291.7677533.277115e-08
1.295251.7676273.256443e-08
1.301231.7675013.235675e-08
1.307231.7673753.214811e-08
1.313271.7672493.193851e-08
1.319331.7671243.172794e-08
1.325431.7669993.151639e-08
1.331551.7668743.130388e-08
1.337691.7667493.109038e-08
1.343871.7666243.087589e-08
1.350071.7664993.066041e-08
1.356311.7663743.044394e-08
1.362571.7662493.022647e-08
1.368861.7661253.000800e-08
1.375181.7662.978851e-08
1.381531.7658762.956802e-08
1.387911.7657512.934650e-08
1.394321.7656272.912397e-08
1.400751.7655022.890040e-08
1.407221.7653782.867580e-08
1.413721.7652532.845017e-08
1.420251.7651292.822349e-08
1.42681.7650042.799577e-08
1.433391.7648792.776700e-08
1.440011.7647542.753717e-08
1.446661.764632.730628e-08
1.453341.7645052.707432e-08
1.460051.764382.684129e-08
1.466791.7642542.660719e-08
1.473561.7641292.637200e-08
1.480361.7640042.613573e-08
1.48721.7638782.589837e-08
1.494071.7637522.565991e-08
1.500961.7636272.542035e-08
1.507891.76352.517969e-08
1.514861.7633742.493791e-08
1.521851.7632482.469502e-08
1.528881.7631212.445100e-08
1.531.7631012.441200e-08
1.535941.7629942.842186e-08
1.543031.7628673.321247e-08
1.550151.7627393.802521e-08
1.557311.7626114.286016e-08
1.56451.7624834.771744e-08
1.571721.7623555.259715e-08
1.578981.7622265.749939e-08
1.586271.7620986.242426e-08
1.593591.7619686.737186e-08
1.600951.7618397.234232e-08
1.608341.7617097.733572e-08
1.615771.7615788.235217e-08
1.623231.7614488.739179e-08
1.630721.7613179.245468e-08
1.638251.7611859.754094e-08
1.645821.7610531.026507e-07
1.653421.7609211.077840e-07
1.661051.7607881.129411e-07
1.668721.7606551.181219e-07
1.676421.7605211.233267e-07
1.684161.7603871.285555e-07
1.691941.7602521.338084e-07
1.699751.7601171.390856e-07
1.70761.7599821.443872e-07
1.715481.7598451.497132e-07
1.72341.7597091.550638e-07
1.731361.7595711.604392e-07
1.739351.7594331.658393e-07
1.747381.7592951.712644e-07
1.755451.7591561.767145e-07
1.763561.7590161.821898e-07
1.77171.7588761.876904e-07
1.779881.7587351.932164e-07
1.78811.7585941.987679e-07
1.796351.7584512.043450e-07
1.804651.7583092.099478e-07
1.812981.7581652.155766e-07
1.821351.7580212.212313e-07
1.829761.7578762.269121e-07
1.838211.757732.326192e-07
1.84671.7575842.383526e-07
1.855221.7574372.441125e-07
1.863791.7572892.498990e-07
1.872391.757142.557122e-07
1.881041.756992.615522e-07
1.889721.756842.674192e-07
1.898451.7566892.733133e-07
1.907211.7565372.792346e-07
1.916021.7563842.851832e-07
1.924861.756232.911593e-07
1.933751.7560762.971630e-07
1.942681.755923.031944e-07
1.951651.7557643.092537e-07
1.960661.7556063.153409e-07
1.969711.7554483.214563e-07
1.971.7554433.216500e-07
1.978811.7552893.456821e-07
1.987941.7551283.706113e-07
1.997121.7549673.956557e-07
2.006341.7548054.208156e-07
2.015611.7546424.460917e-07
2.024911.7544774.714846e-07
2.034261.7543124.969946e-07
2.043651.7541465.226225e-07
2.053091.7539785.483687e-07
2.062571.7538095.742337e-07
2.072091.753646.002182e-07
2.081661.7534696.263226e-07
2.091271.7532976.525476e-07
2.100931.7531246.788936e-07
2.110631.7529497.053613e-07
2.120371.7527747.319512e-07
2.130161.7525977.586639e-07
2.141.7524197.854999e-07
2.149881.7522398.124598e-07
2.15981.7520598.395441e-07
2.169771.7518778.667535e-07
2.179791.7516938.940886e-07
2.189861.7515099.215499e-07
2.199971.7513239.491379e-07
2.210131.7511369.768533e-07
2.220331.7509471.004697e-06
2.230581.7507571.032669e-06
2.240881.7505651.060770e-06
2.251231.7503721.089001e-06
2.261621.7501781.117362e-06
2.272061.7499821.145854e-06
2.282551.7497851.174478e-06
2.293091.7495861.203233e-06
2.303681.7493851.232122e-06
2.314311.7491831.261144e-06
2.3251.748981.290300e-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
—