Optical constants

Refractive index of LASF35 (SCHOTT)

LASF35: n,k 0.37–2.5 µm

Data
formula 2 + tabulated k
Range
0.37–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength. Note: k data cover 380-2500 nm only; k = 0 elsewhere in the n range 370-2500 nm.

At one wavelength

Range 0.37–2.5 µm
Refractive index n
2.02203
Extinction coefficient k
6.97417e-08
Permittivity ε1
4.08862
Permittivity ε2
2.82040e-07
Absorption coefficient α
0.0149149 cm⁻¹
Penetration depth δ = λ/(2πk)
1.34094e+09 nm
Abbe number Vd
29.06
Chromatic dispersion dn/dλ
-0.177143 µm⁻¹
Group index ng
2.12612
Group velocity dispersion
357.038 fs²/mm
Dispersion parameter D
-1947.83 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

# LASF35 (SCHOTT): LASF35
schott_lasf35 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "LASF35", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_lasf35.range_nm)  # (370, 2500) nm
eps = schott_lasf35.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=2.45505861λ2λ2−0.0135670404+0.453006077λ2λ2−0.054580302+2.3851308λ2λ2−167.904715

Valid from 0.37 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C22.45505861
C30.0135670404
C40.453006077
C50.054580302
C62.3851308
C7167.904715

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.43e-07 8.71e-09 -2.71e-11 1.02e-06 1.5e-09 0.263
nd
2.02204
Vd
29.06
glass status
standard
density
value: 5410
thermal expansion
value: 7.4e-06, temperature range: 243 343; value: 8.5e-06, temperature range: 293 573
dPgF
0.0033
resistance
acid: 1.3; stain: 0.0; alkali: 1.0; climatic: 1.0; phosphate: 1.3

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 2.44e-06 K⁻¹ at 633 nm, dn/dT = 5.62e-07 K⁻¹ at 1310 nm, dn/dT = 4.26e-07 K⁻¹ at 1550 nm
Notes on the source data (kept exactly as published):
  • k data cover 380-2500 nm only; k = 0 elsewhere in the n range 370-2500 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 417 wavelengths, the same grid as the API and the library
LASF35 (SCHOTT), LASF35: n and k versus wavelength
λ (µm)nk
0.372.1157830
0.3717762.1139860
0.373562.1122190
0.3753532.1104820
0.3771552.1087740
0.3789652.1070950
0.382.1061513.623600e-06
0.3807842.1054433.506368e-06
0.3826122.1038193.233165e-06
0.3844482.1022212.958650e-06
0.3862942.1006482.682818e-06
0.3881482.0991022.405661e-06
0.392.0975882.128800e-06
0.3900112.0975792.128063e-06
0.3918832.0960812.001143e-06
0.3937642.0946061.873613e-06
0.3956542.0931551.745472e-06
0.3975532.0917261.616715e-06
0.3994612.0903191.487341e-06
0.42.0899261.450800e-06
0.4013782.0889331.385492e-06
0.4033052.0875681.294213e-06
0.4052.086391.213900e-06
0.4052412.0862251.207246e-06
0.4071862.0849011.153477e-06
0.409142.0835971.099451e-06
0.4111042.0823121.045165e-06
0.4130772.0810469.906186e-07
0.415062.0797999.358104e-07
0.4170522.078578.807391e-07
0.4190542.0773598.254035e-07
0.422.0767947.992500e-07
0.4210652.0761657.830412e-07
0.4230862.0749887.522899e-07
0.4251172.0738287.213910e-07
0.4271582.0726846.903438e-07
0.4292082.0715576.591476e-07
0.4312682.0704456.278016e-07
0.4333382.0693495.963052e-07
0.4354182.0682685.646576e-07
0.4362.0679695.558000e-07
0.4375082.0672025.444483e-07
0.4396082.0661515.286382e-07
0.4417182.0651135.127523e-07
0.4438382.064094.967902e-07
0.4459682.0630814.807514e-07
0.4481092.0620864.646356e-07
0.450262.0611034.484425e-07
0.4524212.0601344.321716e-07
0.4545922.0591784.158227e-07
0.4567742.0582343.993953e-07
0.4589672.0573033.828890e-07
0.462.056873.751100e-07
0.461172.0563843.704086e-07
0.4633832.0554773.615119e-07
0.4656072.0545823.525725e-07
0.4678422.0536983.435902e-07
0.4700882.0528263.345647e-07
0.4723442.0519653.254960e-07
0.4746112.0511153.163837e-07
0.4768892.0502753.072276e-07
0.4791782.0494472.980277e-07
0.4814782.0486282.887835e-07
0.4837892.047822.794950e-07
0.4861112.0470232.701619e-07
0.4884452.0462352.607841e-07
0.4907892.0454572.513612e-07
0.4931452.0446882.418930e-07
0.4955122.0439292.323795e-07
0.497892.0431792.228202e-07
0.52.0425252.143400e-07
0.500282.0424392.136565e-07
0.5026812.0417072.077922e-07
0.5050942.0409852.018998e-07
0.5075182.0402711.959791e-07
0.5099542.0395661.900300e-07
0.5124022.0388691.840523e-07
0.5148612.0381811.780460e-07
0.5173332.03751.720108e-07
0.5198162.0368281.659466e-07
0.5223112.0361641.598534e-07
0.5248182.0355081.537308e-07
0.5273372.0348591.475789e-07
0.5298682.0342191.413975e-07
0.5324112.0335851.351864e-07
0.5349672.0329591.289455e-07
0.5375342.032341.226747e-07
0.5401142.0317291.163737e-07
0.5427072.0311241.100425e-07
0.5453122.0305271.036809e-07
0.5462.030371.020000e-07
0.5479292.0299361.002708e-07
0.5505592.0293529.791333e-08
0.5532022.0287759.554457e-08
0.5558572.0282049.316444e-08
0.5585252.0276399.077288e-08
0.5612062.0270828.836985e-08
0.5638992.026538.595528e-08
0.5666062.0259848.352912e-08
0.5693262.0254458.109132e-08
0.5720582.0249127.864181e-08
0.5748042.0243847.618055e-08
0.5775632.0238637.370748e-08
0.582.0234097.152300e-08
0.5803352.0233477.144444e-08
0.5831212.0228377.079159e-08
0.585922.0223337.013560e-08
0.5887322.0218346.947647e-08
0.5915582.021346.881417e-08
0.5943972.0208526.814869e-08
0.597252.0203696.748002e-08
0.6001172.0198926.680814e-08
0.6029972.0194196.613304e-08
0.6058912.0189526.545469e-08
0.60882.0184896.477309e-08
0.6117222.0180326.408822e-08
0.6146582.0175796.340006e-08
0.6176082.0171326.270860e-08
0.622.0167746.214800e-08
0.6205732.0166896.205063e-08
0.6235512.016256.154404e-08
0.6265442.0158176.103502e-08
0.6295512.0153886.052355e-08
0.6325732.0149636.000963e-08
0.6356092.0145435.949324e-08
0.638662.0141275.897438e-08
0.6417262.0137165.845302e-08
0.6448062.0133085.792916e-08
0.6479012.0129055.740279e-08
0.651012.0125065.687389e-08
0.6541352.0121125.634245e-08
0.6572752.0117215.580846e-08
0.662.0113865.534500e-08
0.660432.0113345.520961e-08
0.66362.0109515.421092e-08
0.6667852.0105725.320744e-08
0.6699852.0101975.219914e-08
0.6732012.0098265.118600e-08
0.6764322.0094585.016800e-08
0.6796792.0090944.914511e-08
0.6829412.0087344.811732e-08
0.6862192.0083774.708459e-08
0.6895132.0080244.604690e-08
0.6928232.0076744.500423e-08
0.6961482.0073284.395656e-08
0.6994892.0069854.290386e-08
0.72.0069334.274300e-08
0.7028472.0066454.256556e-08
0.706222.0063094.235530e-08
0.709612.0059764.214402e-08
0.7130162.0056464.193174e-08
0.7164382.005324.171843e-08
0.7198772.0049964.150410e-08
0.7233322.0046764.128874e-08
0.7268042.0043594.107235e-08
0.7302932.0040444.085491e-08
0.7337982.0037334.063644e-08
0.737322.0034254.041691e-08
0.7408592.0031194.019634e-08
0.7444152.0028163.997470e-08
0.7479882.0025173.975200e-08
0.7515782.002223.952823e-08
0.7551862.0019253.930339e-08
0.7588112.0016343.907746e-08
0.7624532.0013453.885046e-08
0.7661122.0010593.862236e-08
0.769792.0007753.839317e-08
0.7734842.0004943.816288e-08
0.7771972.0002153.793148e-08
0.7809271.9999393.769897e-08
0.7846761.9996663.746535e-08
0.7884421.9993953.723060e-08
0.7922261.9991263.699473e-08
0.7960291.998863.675773e-08
0.799851.9985963.651959e-08
0.8036891.9983343.628030e-08
0.8075461.9980753.603987e-08
0.8114221.9978183.579828e-08
0.8153171.9975633.555554e-08
0.8192311.997313.531163e-08
0.8231631.997063.506654e-08
0.8271141.9968113.482029e-08
0.8310841.9965653.457285e-08
0.8350731.9963213.432422e-08
0.8390811.9960783.407440e-08
0.8431081.9958383.382337e-08
0.8471551.99563.357115e-08
0.8512211.9953643.331771e-08
0.8553071.9951293.306306e-08
0.8594121.9948973.280719e-08
0.8635371.9946673.255008e-08
0.8676821.9944383.229174e-08
0.8718471.9942113.203217e-08
0.8760321.9939863.177134e-08
0.8802361.9937633.150927e-08
0.8844611.9935423.124594e-08
0.8887071.9933223.098134e-08
0.8929721.9931043.071547e-08
0.8972581.9928873.044833e-08
0.9015651.9926733.017991e-08
0.9058921.992462.991019e-08
0.910241.9922482.963918e-08
0.9146091.9920382.936687e-08
0.9189991.991832.909326e-08
0.923411.9916232.881833e-08
0.9278431.9914182.854208e-08
0.9322961.9912142.826451e-08
0.9367711.9910122.798560e-08
0.9412671.9908112.770535e-08
0.9457851.9906122.742376e-08
0.9503251.9904142.714082e-08
0.9548861.9902182.685652e-08
0.9594691.9900222.657085e-08
0.9640751.9898292.628382e-08
0.9687021.9896362.599540e-08
0.9733521.9894452.570560e-08
0.9780231.9892552.541442e-08
0.9827181.9890662.512183e-08
0.9874351.9888792.482784e-08
0.9921741.9886922.453243e-08
0.9969361.9885072.423561e-08
1.001721.9883242.393737e-08
1.006531.9881412.363769e-08
1.011361.9879592.333658e-08
1.016221.9877792.303402e-08
1.021091.98762.273001e-08
1.025991.9874222.242453e-08
1.030921.9872442.211760e-08
1.035871.9870682.180918e-08
1.040841.9868932.149929e-08
1.045831.9867192.118791e-08
1.050851.9865462.087504e-08
1.05591.9863742.056067e-08
1.061.9862352.030500e-08
1.060971.9862032.039426e-08
1.066061.9860332.086474e-08
1.071181.9858642.133747e-08
1.076321.9856952.181247e-08
1.081481.9855282.228976e-08
1.086671.9853612.276933e-08
1.091891.9851952.325121e-08
1.097131.985032.373540e-08
1.10241.9848662.422191e-08
1.107691.9847032.471076e-08
1.1131.9845412.520195e-08
1.118351.9843792.569550e-08
1.123711.9842182.619143e-08
1.129111.9840582.668973e-08
1.134531.9838982.719042e-08
1.139971.9837392.769352e-08
1.145451.9835812.819903e-08
1.150941.9834242.870697e-08
1.156471.9832672.921734e-08
1.162021.9831112.973017e-08
1.16761.9829553.024545e-08
1.17321.98283.076321e-08
1.178831.9826463.128346e-08
1.184491.9824923.180620e-08
1.190171.9823393.233145e-08
1.195891.9821863.285922e-08
1.201631.9820343.338953e-08
1.207391.9818823.392238e-08
1.213191.9817313.445779e-08
1.219011.9815813.499577e-08
1.224861.981433.553633e-08
1.230741.9812813.607948e-08
1.236651.9811313.662525e-08
1.242591.9809823.717363e-08
1.248551.9808343.772464e-08
1.254541.9806863.827830e-08
1.260561.9805383.883462e-08
1.266621.9803913.939360e-08
1.272691.9802443.995527e-08
1.27881.9800974.051964e-08
1.284941.9799514.108671e-08
1.291111.9798054.165651e-08
1.297311.9796594.222904e-08
1.303531.9795144.280432e-08
1.309791.9793684.338236e-08
1.316081.9792234.396317e-08
1.322391.9790794.454677e-08
1.328741.9789344.513318e-08
1.335121.978794.572240e-08
1.341531.9786464.631444e-08
1.347971.9785024.690933e-08
1.354441.9783584.750707e-08
1.360941.9782144.810769e-08
1.367471.9780714.871118e-08
1.374031.9779274.931757e-08
1.380631.9777844.992688e-08
1.387251.9776415.053910e-08
1.393911.9774985.115427e-08
1.40061.9773555.177239e-08
1.407331.9772125.239347e-08
1.414081.9770695.301754e-08
1.420871.9769265.364460e-08
1.427691.9767835.427467e-08
1.434541.9766395.490777e-08
1.441431.9764965.554390e-08
1.448341.9763535.618309e-08
1.45531.976215.682535e-08
1.462281.9760675.747068e-08
1.46931.9759245.811912e-08
1.476351.975785.877067e-08
1.483441.9756375.942534e-08
1.490561.9754936.008316e-08
1.497711.9753496.074414e-08
1.50491.9752056.140829e-08
1.512131.9750616.207562e-08
1.519381.9749176.274616e-08
1.526681.9747736.341992e-08
1.531.9747076.372700e-08
1.5341.9746286.704325e-08
1.541371.9744837.314165e-08
1.548771.9743387.926932e-08
1.55621.9741928.542639e-08
1.563671.9740479.161302e-08
1.571171.9739019.782935e-08
1.578711.9737541.040755e-07
1.586291.9736081.103517e-07
1.593911.9734611.166579e-07
1.601561.9733141.229945e-07
1.609241.9731661.293614e-07
1.616971.9730181.357589e-07
1.624731.972871.421871e-07
1.632531.9727211.486462e-07
1.640361.9725721.551363e-07
1.648241.9724221.616575e-07
1.656151.9722721.682100e-07
1.66411.9721211.747940e-07
1.672081.971971.814096e-07
1.680111.9718191.880569e-07
1.688171.9716671.947362e-07
1.696281.9715142.014475e-07
1.704421.9713612.081910e-07
1.71261.9712072.149669e-07
1.720821.9710532.217753e-07
1.729081.9708982.286163e-07
1.737381.9707432.354902e-07
1.745721.9705872.423972e-07
1.75411.970432.493372e-07
1.762521.9702732.563106e-07
1.770981.9701152.633174e-07
1.779481.9699562.703579e-07
1.788021.9697972.774322e-07
1.79661.9696372.845404e-07
1.805221.9694762.916827e-07
1.813891.9693142.988594e-07
1.822591.9691523.060704e-07
1.831341.9689893.133161e-07
1.840131.9688253.205966e-07
1.848971.968663.279120e-07
1.857841.9684953.352625e-07
1.866761.9683283.426483e-07
1.875721.9681613.500695e-07
1.884721.9679933.575264e-07
1.893771.9678243.650191e-07
1.902861.9676543.725477e-07
1.911991.9674833.801124e-07
1.921171.9673113.877135e-07
1.930391.9671383.953511e-07
1.939651.9669654.030253e-07
1.948961.966794.107363e-07
1.958321.9666144.184844e-07
1.967721.9664374.262696e-07
1.971.9663944.281600e-07
1.977161.9662594.685724e-07
1.986651.966085.221185e-07
1.996191.96595.759216e-07
2.005771.9657196.299829e-07
2.01541.9655366.843038e-07
2.025071.9653537.388853e-07
2.034791.9651687.937288e-07
2.044561.9649828.488356e-07
2.054371.9647959.042069e-07
2.064231.9646079.598439e-07
2.074141.9644171.015748e-06
2.084091.9642261.071920e-06
2.09411.9640341.128362e-06
2.104151.963841.185075e-06
2.114251.9636451.242061e-06
2.12441.9634491.299319e-06
2.134591.9632521.356853e-06
2.144841.9630531.414662e-06
2.155131.9628521.472750e-06
2.165481.962651.531116e-06
2.175871.9624471.589762e-06
2.186321.9622421.648689e-06
2.196811.9620361.707900e-06
2.207351.9618281.767394e-06
2.217951.9616191.827174e-06
2.228591.9614081.887242e-06
2.239291.9611951.947597e-06
2.250041.9609812.008242e-06
2.260841.9607652.069178e-06
2.271691.9605472.130407e-06
2.282591.9603282.191930e-06
2.293551.9601072.253747e-06
2.304561.9598852.315862e-06
2.315621.959662.378275e-06
2.3251.9594692.431200e-06
2.326731.9594342.454257e-06
2.33791.9592062.602707e-06
2.349121.9589762.751869e-06
2.36041.9587442.901747e-06
2.371731.958513.052345e-06
2.383111.9582753.203666e-06
2.394551.9580373.355713e-06
2.406041.9577983.508490e-06
2.417591.9575563.662000e-06
2.42921.9573133.816246e-06
2.440861.9570673.971234e-06
2.452571.9568194.126965e-06
2.464341.9565694.283443e-06
2.476171.9563174.440673e-06
2.488061.9560634.598657e-06
2.51.9558074.757400e-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
—