Optical constants

Refractive index of N-LASF46A (SCHOTT)

N-LASF46A: 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.

At one wavelength

Range 0.37–2.5 µm
Refractive index n
1.90365
Extinction coefficient k
3.35918e-08
Permittivity ε1
3.6239
Permittivity ε2
1.27894e-07
Absorption coefficient α
0.00718391 cm⁻¹
Penetration depth δ = λ/(2πk)
2.78400e+09 nm
Abbe number Vd
31.32
Chromatic dispersion dn/dλ
-0.145573 µm⁻¹
Group index ng
1.98919
Group velocity dispersion
289.339 fs²/mm
Dispersion parameter D
-1578.5 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-LASF46A (SCHOTT): N-LASF46A
schott_n_lasf46a = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-LASF46A", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_lasf46a.range_nm)  # (370, 2500) nm
eps = schott_n_lasf46a.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=2.16701566λ2λ2−0.0123595524+0.319812761λ2λ2−0.0560610282+1.66004486λ2λ2−107.047718

Valid from 0.37 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C22.16701566
C30.0123595524
C40.319812761
C50.0560610282
C61.66004486
C7107.047718

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 3.53e-06 1.24e-08 -1.87e-11 8.39e-07 1.04e-09 0.275
nd
1.90366
Vd
31.32
glass code
904313.445
glass status
standard
density
value: 4449
thermal expansion
value: 6e-06, temperature range: 243 343; value: 7.15e-06, temperature range: 293 573
dPgF
0.0042
resistance
acid: 3.0; 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 = 4.19e-06 K⁻¹ at 633 nm, dn/dT = 2.69e-06 K⁻¹ at 1310 nm, dn/dT = 2.58e-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 417 wavelengths, the same grid as the API and the library
N-LASF46A (SCHOTT), N-LASF46A: n and k versus wavelength
λ (µm)nk
0.371.980295.027400e-06
0.3717761.9788184.502932e-06
0.373561.9773713.975947e-06
0.3753531.9759493.446433e-06
0.3771551.9745522.914377e-06
0.3789651.9731782.379767e-06
0.381.9724062.074200e-06
0.3807841.9718271.995985e-06
0.3826121.9704991.813710e-06
0.3844481.9691921.630559e-06
0.3862941.9679061.446529e-06
0.3881481.9666421.261616e-06
0.391.9654051.076900e-06
0.3900111.9653981.076436e-06
0.3918831.9641739.965964e-07
0.3937641.9629689.163733e-07
0.3956541.9617828.357652e-07
0.3975531.9606157.547701e-07
0.3994611.9594656.733863e-07
0.41.9591456.504000e-07
0.4013781.9583346.187688e-07
0.4033051.9572195.745586e-07
0.4051.9562575.356600e-07
0.4052411.9561225.323945e-07
0.4071861.9550415.060075e-07
0.409141.9539764.794940e-07
0.4111041.9529274.528531e-07
0.4130771.9518934.260844e-07
0.415061.9508753.991872e-07
0.4170521.9498723.721609e-07
0.4190541.9488833.450048e-07
0.421.9484223.321700e-07
0.4210651.9479083.250713e-07
0.4230861.9469483.116036e-07
0.4251171.9460012.980713e-07
0.4271581.9450672.844740e-07
0.4292081.9441472.708115e-07
0.4312681.943242.570834e-07
0.4333381.9423452.432894e-07
0.4354181.9414632.294292e-07
0.4361.9412192.255500e-07
0.4375081.9405932.210719e-07
0.4396081.9397342.148350e-07
0.4417181.9388882.085682e-07
0.4438381.9380532.022713e-07
0.4459681.9372291.959442e-07
0.4481091.9364171.895868e-07
0.450261.9356151.831988e-07
0.4524211.9348241.767801e-07
0.4545921.9340431.703307e-07
0.4567741.9332731.638503e-07
0.4589671.9325131.573387e-07
0.461.9321591.542700e-07
0.461171.9317621.521460e-07
0.4633831.9310221.481265e-07
0.4656071.9302911.440878e-07
0.4678421.9295691.400297e-07
0.4700881.9288571.359521e-07
0.4723441.9281541.318550e-07
0.4746111.9274591.277381e-07
0.4768891.9267741.236015e-07
0.4791781.9260971.194451e-07
0.4814781.9254291.152687e-07
0.4837891.9247691.110723e-07
0.4861111.9241171.068557e-07
0.4884451.9234731.026189e-07
0.4907891.9228379.836173e-08
0.4931451.9222099.408414e-08
0.4955121.9215898.978602e-08
0.497891.9209768.546727e-08
0.51.9204418.163600e-08
0.500281.9203718.137454e-08
0.5026811.9197737.913125e-08
0.5050941.9191827.687719e-08
0.5075181.9185987.461232e-08
0.5099541.9180227.233657e-08
0.5124021.9174527.004990e-08
0.5148611.9168896.775226e-08
0.5173331.9163326.544359e-08
0.5198161.9157836.312383e-08
0.5223111.9152396.079294e-08
0.5248181.9147025.845087e-08
0.5273371.9141715.609755e-08
0.5298681.9136475.373294e-08
0.5324111.9131285.135697e-08
0.5349671.9126154.896961e-08
0.5375341.9121094.657078e-08
0.5401141.9116084.416044e-08
0.5427071.9111124.173853e-08
0.5453121.9106233.930500e-08
0.5461.9104953.866200e-08
0.5479291.9101393.837104e-08
0.5505591.909663.797438e-08
0.5532021.9091873.757582e-08
0.5558571.9087193.717535e-08
0.5585251.9082563.677295e-08
0.5612061.9077993.636862e-08
0.5638991.9073463.596235e-08
0.5666061.9068993.555413e-08
0.5693261.9064563.514395e-08
0.5720581.9060183.473180e-08
0.5748041.9055863.431767e-08
0.5775631.9051573.390156e-08
0.581.9047853.353400e-08
0.5803351.9047343.353655e-08
0.5831211.9043153.355772e-08
0.585921.90393.357899e-08
0.5887321.903493.360036e-08
0.5915581.9030853.362184e-08
0.5943971.9026833.364342e-08
0.597251.9022863.366510e-08
0.6001171.9018933.368689e-08
0.6029971.9015053.370878e-08
0.6058911.901123.373077e-08
0.60881.900743.375288e-08
0.6117221.9003633.377509e-08
0.6146581.899993.379740e-08
0.6176081.8996223.381982e-08
0.621.8993273.383800e-08
0.6205731.8992573.380813e-08
0.6235511.8988953.365272e-08
0.6265441.8985383.349656e-08
0.6295511.8981843.333966e-08
0.6325731.8978343.318200e-08
0.6356091.8974873.302358e-08
0.638661.8971443.286441e-08
0.6417261.8968043.270447e-08
0.6448061.8964683.254376e-08
0.6479011.8961353.238228e-08
0.651011.8958053.222003e-08
0.6541351.8954793.205700e-08
0.6572751.8951563.189318e-08
0.661.8948793.175100e-08
0.660431.8948363.167467e-08
0.66361.8945193.111161e-08
0.6667851.8942053.054585e-08
0.6699851.8938952.997737e-08
0.6732011.8935872.940616e-08
0.6764321.8932822.883221e-08
0.6796791.8929812.825551e-08
0.6829411.8926822.767604e-08
0.6862191.8923862.709378e-08
0.6895131.8920932.650874e-08
0.6928231.8918022.592088e-08
0.6961481.8915152.533020e-08
0.6994891.891232.473669e-08
0.71.8911862.464600e-08
0.7028471.8909472.453126e-08
0.706221.8906682.439530e-08
0.709611.8903912.425869e-08
0.7130161.8901162.412142e-08
0.7164381.8898442.398349e-08
0.7198771.8895752.384489e-08
0.7233321.8893082.370564e-08
0.7268041.8890432.356571e-08
0.7302931.8887812.342511e-08
0.7337981.8885212.328384e-08
0.737321.8882632.314189e-08
0.7408591.8880082.299926e-08
0.7444151.8877552.285594e-08
0.7479881.8875052.271194e-08
0.7515781.8872562.256725e-08
0.7551861.887012.242186e-08
0.7588111.8867652.227577e-08
0.7624531.8865232.212898e-08
0.7661121.8862832.198149e-08
0.769791.8860452.183328e-08
0.7734841.8858092.168437e-08
0.7771971.8855752.153475e-08
0.7809271.8853432.138440e-08
0.7846761.8851132.123333e-08
0.7884421.8848852.108154e-08
0.7922261.8846592.092902e-08
0.7960291.8844342.077577e-08
0.799851.8842122.062178e-08
0.8036891.8839912.046705e-08
0.8075461.8837722.031158e-08
0.8114221.8835552.015536e-08
0.8153171.8833391.999840e-08
0.8192311.8831251.984068e-08
0.8231631.8829131.968220e-08
0.8271141.8827021.952296e-08
0.8310841.8824941.936296e-08
0.8350731.8822861.920219e-08
0.8390811.8820811.904065e-08
0.8431081.8818771.887834e-08
0.8471551.8816741.871524e-08
0.8512211.8814731.855136e-08
0.8553071.8812731.838670e-08
0.8594121.8810751.822124e-08
0.8635371.8808781.805499e-08
0.8676821.8806831.788794e-08
0.8718471.8804891.772009e-08
0.8760321.8802971.755144e-08
0.8802361.8801061.738198e-08
0.8844611.8799161.721170e-08
0.8887071.8797271.704060e-08
0.8929721.879541.686869e-08
0.8972581.8793541.669594e-08
0.9015651.879171.652237e-08
0.9058921.8789861.634797e-08
0.910241.8788041.617273e-08
0.9146091.8786231.599665e-08
0.9189991.8784431.581972e-08
0.923411.8782651.564194e-08
0.9278431.8780871.546331e-08
0.9322961.8779111.528383e-08
0.9367711.8777351.510348e-08
0.9412671.8775611.492226e-08
0.9457851.8773881.474018e-08
0.9503251.8772161.455722e-08
0.9548861.8770441.437338e-08
0.9594691.8768741.418867e-08
0.9640751.8767051.400306e-08
0.9687021.8765371.381656e-08
0.9733521.876371.362917e-08
0.9780231.8762031.344088e-08
0.9827181.8760381.325169e-08
0.9874351.8758731.306159e-08
0.9921741.875711.287057e-08
0.9969361.8755471.267864e-08
1.001721.8753851.248579e-08
1.006531.8752241.229201e-08
1.011361.8750641.209730e-08
1.016221.8749041.190165e-08
1.021091.8747451.170507e-08
1.025991.8745871.150755e-08
1.030921.874431.130907e-08
1.035871.8742741.110965e-08
1.040841.8741181.090926e-08
1.045831.8739631.070792e-08
1.050851.8738081.050560e-08
1.05591.8736541.030232e-08
1.061.873531.013700e-08
1.060971.8735011.034911e-08
1.066061.8733491.146709e-08
1.071181.8731971.259044e-08
1.076321.8730461.371919e-08
1.081481.8728951.485335e-08
1.086671.8727451.599295e-08
1.091891.8725951.713803e-08
1.097131.8724461.828860e-08
1.10241.8722971.944469e-08
1.107691.8721492.060633e-08
1.1131.8720022.177355e-08
1.118351.8718552.294637e-08
1.123711.8717082.412482e-08
1.129111.8715622.530892e-08
1.134531.8714162.649871e-08
1.139971.8712712.769421e-08
1.145451.8711262.889545e-08
1.150941.8709813.010246e-08
1.156471.8708373.131525e-08
1.162021.8706933.253387e-08
1.16761.870553.375834e-08
1.17321.8704063.498868e-08
1.178831.8702643.622493e-08
1.184491.8701213.746712e-08
1.190171.8699793.871526e-08
1.195891.8698373.996940e-08
1.201631.8696954.122956e-08
1.207391.8695534.249576e-08
1.213191.8694124.376805e-08
1.219011.8692714.504643e-08
1.224861.869134.633096e-08
1.230741.8689894.762165e-08
1.236651.8688494.891854e-08
1.242591.8687085.022165e-08
1.248551.8685685.153101e-08
1.254541.8684285.284666e-08
1.260561.8682885.416863e-08
1.266621.8681485.549694e-08
1.272691.8680085.683162e-08
1.27881.8678685.817272e-08
1.284941.8677285.952025e-08
1.291111.8675886.087424e-08
1.297311.8674496.223474e-08
1.303531.8673096.360177e-08
1.309791.8671696.497535e-08
1.316081.8670296.635553e-08
1.322391.866896.774234e-08
1.328741.866756.913580e-08
1.335121.866617.053595e-08
1.341531.866477.194282e-08
1.347971.866337.335644e-08
1.354441.866197.477685e-08
1.360941.8660497.620408e-08
1.367471.8659097.763815e-08
1.374031.8657687.907911e-08
1.380631.8656288.052699e-08
1.387251.8654878.198181e-08
1.393911.8653468.344362e-08
1.40061.8652058.491245e-08
1.407331.8650638.638832e-08
1.414081.8649218.787128e-08
1.420871.8647798.936136e-08
1.427691.8646379.085859e-08
1.434541.8644949.236300e-08
1.441431.8643529.387464e-08
1.448341.8642099.539353e-08
1.45531.8640659.691971e-08
1.462281.8639219.845322e-08
1.46931.8637779.999409e-08
1.476351.8636331.015424e-07
1.483441.8634881.030980e-07
1.490561.8633421.046612e-07
1.497711.8631971.062319e-07
1.50491.8630511.078101e-07
1.512131.8629041.093959e-07
1.519381.8627571.109892e-07
1.526681.862611.125903e-07
1.531.8625421.133200e-07
1.5341.8624621.189385e-07
1.541371.8623131.292705e-07
1.548771.8621641.396521e-07
1.55621.8620151.500836e-07
1.563671.8618651.605651e-07
1.571171.8617141.710969e-07
1.578711.8615631.816793e-07
1.586291.8614111.923125e-07
1.593911.8612592.029967e-07
1.601561.8611062.137322e-07
1.609241.8609522.245192e-07
1.616971.8607982.353580e-07
1.624731.8606432.462488e-07
1.632531.8604872.571919e-07
1.640361.860332.681875e-07
1.648241.8601732.792359e-07
1.656151.8600152.903373e-07
1.66411.8598573.014921e-07
1.672081.8596973.127003e-07
1.680111.8595373.239624e-07
1.688171.8593763.352785e-07
1.696281.8592153.466489e-07
1.704421.8590523.580739e-07
1.71261.8588883.695537e-07
1.720821.8587243.810886e-07
1.729081.8585593.926789e-07
1.737381.8583934.043249e-07
1.745721.8582254.160267e-07
1.75411.8580574.277847e-07
1.762521.8578884.395991e-07
1.770981.8577184.514703e-07
1.779481.8575474.633984e-07
1.788021.8573754.753838e-07
1.79661.8572024.874267e-07
1.805221.8570284.995274e-07
1.813891.8568535.116862e-07
1.822591.8566775.239033e-07
1.831341.8564995.361791e-07
1.840131.8563215.485138e-07
1.848971.8561415.609077e-07
1.857841.855965.733611e-07
1.866761.8557785.858743e-07
1.875721.8555955.984475e-07
1.884721.855416.110811e-07
1.893771.8552246.237753e-07
1.902861.8550376.365305e-07
1.911991.8548496.493468e-07
1.921171.8546596.622247e-07
1.930391.8544686.751644e-07
1.939651.8542766.881662e-07
1.948961.8540827.012304e-07
1.958321.8538877.143574e-07
1.967721.8536917.275473e-07
1.971.8536437.307500e-07
1.977161.8534938.025820e-07
1.986651.8532938.977587e-07
1.996191.8530929.933923e-07
2.005771.852891.089485e-06
2.01541.8526861.186039e-06
2.025071.852481.283056e-06
2.034791.8522731.380539e-06
2.044561.8520651.478490e-06
2.054371.8518541.576911e-06
2.064231.8516421.675804e-06
2.074141.8514281.775172e-06
2.084091.8512131.875017e-06
2.09411.8509961.975341e-06
2.104151.8507772.076147e-06
2.114251.8505562.177437e-06
2.12441.8503342.279212e-06
2.134591.850112.381477e-06
2.144841.8498832.484232e-06
2.155131.8496552.587480e-06
2.165481.8494252.691224e-06
2.175871.8491932.795466e-06
2.186321.848962.900208e-06
2.196811.8487243.005453e-06
2.207351.8484863.111203e-06
2.217951.8482463.217461e-06
2.228591.8480043.324228e-06
2.239291.847763.431509e-06
2.250041.8475133.539304e-06
2.260841.8472653.647616e-06
2.271691.8470143.756448e-06
2.282591.8467623.865803e-06
2.293551.8465063.975683e-06
2.304561.8462494.086090e-06
2.315621.8459894.197027e-06
2.3251.8457684.291100e-06
2.326731.8457274.364486e-06
2.33791.8454634.836977e-06
2.349121.8451965.311735e-06
2.36041.8449265.788773e-06
2.371731.8446556.268100e-06
2.383111.844386.749728e-06
2.394551.8441037.233668e-06
2.406041.8438247.719930e-06
2.417591.8435428.208526e-06
2.42921.8432578.699468e-06
2.440861.8429699.192766e-06
2.452571.8426799.688432e-06
2.464341.8423861.018648e-05
2.476171.842091.068691e-05
2.488061.8417911.118975e-05
2.51.841491.169500e-05

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
—