Optical constants

Refractive index of N-LASF46B (SCHOTT)

N-LASF46B: n,k 0.365–2.5 µm

Data
formula 2 + tabulated k
Range
0.365–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength. Note: k data cover 370-2500 nm only; k = 0 elsewhere in the n range 365-2500 nm.

At one wavelength

Range 0.365–2.5 µm
Refractive index n
1.90365
Extinction coefficient k
3.20691e-08
Permittivity ε1
3.6239
Permittivity ε2
1.22097e-07
Absorption coefficient α
0.00685827 cm⁻¹
Penetration depth δ = λ/(2πk)
2.91619e+09 nm
Abbe number Vd
31.32
Chromatic dispersion dn/dλ
-0.145552 µm⁻¹
Group index ng
1.98918
Group velocity dispersion
289.681 fs²/mm
Dispersion parameter D
-1580.36 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-LASF46B (SCHOTT): N-LASF46B
schott_n_lasf46b = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-LASF46B", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_lasf46b.range_nm)  # (365, 2500) nm
eps = schott_n_lasf46b.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=2.17988922λ2λ2−0.0125805384+0.306495184λ2λ2−0.0567191367+1.56882437λ2λ2−105.316538

Valid from 0.365 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C22.17988922
C30.0125805384
C40.306495184
C50.0567191367
C61.56882437
C7105.316538

Comments and conditions

suitable for precision molding

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 5.98e-06 1.3e-08 -3.5e-12 9.13e-07 1.24e-09 0.267
nd
1.90366
Vd
31.32
glass code
904313.451
glass status
standard
density
value: 4510
thermal expansion
value: 5.97e-06, temperature range: 243 343; value: 7.11e-06, temperature range: 293 573
dPgF
0.0045
resistance
acid: 3.3; 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 = 6.00e-06 K⁻¹ at 633 nm, dn/dT = 4.35e-06 K⁻¹ at 1310 nm, dn/dT = 4.22e-06 K⁻¹ at 1550 nm
Notes on the source data (kept exactly as published):
  • k data cover 370-2500 nm only; k = 0 elsewhere in the n range 365-2500 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 418 wavelengths, the same grid as the API and the library
N-LASF46B (SCHOTT), N-LASF46B: n and k versus wavelength
λ (µm)nk
0.3651.9846760
0.3667641.9831140
0.3685371.981580
0.371.980344.549900e-06
0.3703191.9800734.461483e-06
0.3721091.9785933.965218e-06
0.3739081.9771393.466554e-06
0.3757151.975712.965479e-06
0.3775321.9743052.461982e-06
0.3793571.9729251.956051e-06
0.381.9724451.777700e-06
0.381191.9715671.671492e-06
0.3830331.9702331.507097e-06
0.3848851.968921.341908e-06
0.3867451.9676291.175920e-06
0.3886151.9663591.009129e-06
0.391.9654368.855600e-07
0.3904941.965118.679660e-07
0.3923811.9638818.006685e-07
0.3942781.9626717.330457e-07
0.3961841.9614816.650960e-07
0.3980991.9603095.968178e-07
0.41.9591695.290500e-07
0.4000241.9591555.286373e-07
0.4019571.958024.947852e-07
0.40391.9569024.607694e-07
0.4051.9562794.415200e-07
0.4058531.9558014.315008e-07
0.4078151.9547164.084534e-07
0.4097861.9536483.852946e-07
0.4117671.9525963.620239e-07
0.4137581.951563.386407e-07
0.4157581.9505393.151444e-07
0.4177681.9495332.915346e-07
0.4197871.9485422.678106e-07
0.421.9484382.653100e-07
0.4218161.9475652.571316e-07
0.4238561.9466022.479506e-07
0.4259041.9456532.387252e-07
0.4279631.9447172.294552e-07
0.4300321.9437952.201404e-07
0.4321111.9428862.107806e-07
0.43421.9419892.013755e-07
0.4361.941231.932700e-07
0.4362991.9411051.925832e-07
0.4384081.9402341.877340e-07
0.4405271.9393741.828614e-07
0.4426571.9385261.779652e-07
0.4447971.937691.730454e-07
0.4469471.9368651.681017e-07
0.4491071.9360511.631342e-07
0.4512781.9352481.581427e-07
0.453461.9344561.531270e-07
0.4556521.9336751.480871e-07
0.4578551.9329041.430229e-07
0.461.9321661.380900e-07
0.4600681.9321431.379886e-07
0.4622921.9313921.346637e-07
0.4645271.930651.313227e-07
0.4667721.9299191.279655e-07
0.4690291.9291971.245921e-07
0.4712961.9284841.212024e-07
0.4735741.927781.177963e-07
0.4758631.9270861.143738e-07
0.4781641.92641.109347e-07
0.4804751.9257231.074790e-07
0.4827981.9250541.040066e-07
0.4851321.9243941.005173e-07
0.4874771.9237429.701127e-08
0.4898331.9230989.348824e-08
0.4922011.9224628.994818e-08
0.4945811.9218348.639101e-08
0.4969721.9212148.281665e-08
0.4993741.9206017.922500e-08
0.51.9204447.828900e-08
0.5017881.9199967.702563e-08
0.5042141.9193987.531163e-08
0.5066511.9188087.358933e-08
0.50911.9182247.185872e-08
0.5115611.9176487.011973e-08
0.5140341.9170786.837234e-08
0.5165191.9165166.661650e-08
0.5190161.915966.485218e-08
0.5215251.915416.307932e-08
0.5240461.9148676.129790e-08
0.5265791.9143315.950786e-08
0.5291251.91385.770918e-08
0.5316831.9132765.590179e-08
0.5342531.9127585.408567e-08
0.5368351.9122465.226077e-08
0.5394311.911745.042705e-08
0.5420381.911244.858446e-08
0.5446581.9107454.673297e-08
0.5461.9104954.578500e-08
0.5472911.9102564.531970e-08
0.5499371.9097734.436641e-08
0.5525951.9092954.340851e-08
0.5552671.9088224.244598e-08
0.5579511.9083554.147880e-08
0.5606481.9078934.050695e-08
0.5633581.9074363.953039e-08
0.5660821.9069853.854912e-08
0.5688181.9065383.756310e-08
0.5715681.9060963.657232e-08
0.5743311.905663.557674e-08
0.5771071.9052273.457635e-08
0.5798971.90483.357113e-08
0.581.9047853.353400e-08
0.58271.9043783.301353e-08
0.5855171.9039593.247059e-08
0.5883471.9035463.192503e-08
0.5911921.9031373.137682e-08
0.5940491.9027323.082597e-08
0.5969211.9023323.027245e-08
0.5998071.9019362.971626e-08
0.6027061.9015442.915738e-08
0.605621.9011572.859580e-08
0.6085471.9007732.803150e-08
0.6114891.9003942.746448e-08
0.6144451.9000182.689471e-08
0.6174151.8996472.632219e-08
0.621.8993282.582400e-08
0.62041.8992792.577690e-08
0.6233991.8989152.542376e-08
0.6264131.8985552.506892e-08
0.6294411.8981992.471235e-08
0.6324831.8978462.435407e-08
0.6355411.8974972.399405e-08
0.6386131.8971512.363229e-08
0.64171.8968092.326879e-08
0.6448021.8964712.290352e-08
0.6479191.8961362.253649e-08
0.6510511.8958042.216769e-08
0.6541991.8954762.179710e-08
0.6573611.895152.142473e-08
0.661.8948832.111400e-08
0.6605391.8948292.107066e-08
0.6637321.894512.081386e-08
0.666941.8941942.055581e-08
0.6701651.8938822.029652e-08
0.6734041.8935732.003597e-08
0.6766591.8932661.977416e-08
0.679931.8929631.951109e-08
0.6832171.8926631.924675e-08
0.686521.8923651.898113e-08
0.6898391.8920711.871422e-08
0.6931731.8917791.844603e-08
0.6965241.891491.817653e-08
0.6998911.8912031.790574e-08
0.71.8911941.789700e-08
0.7032751.890921.785721e-08
0.7066741.8906391.781591e-08
0.710091.8903611.777440e-08
0.7135231.8900851.773269e-08
0.7169721.8898121.769079e-08
0.7204381.8895411.764868e-08
0.7239211.8892731.760636e-08
0.727421.8890081.756384e-08
0.7309371.8887451.752112e-08
0.734471.8884841.747819e-08
0.7380211.8882251.743505e-08
0.7415881.8879691.739170e-08
0.7451731.8877161.734815e-08
0.7487751.8874641.730438e-08
0.7523951.8872151.726040e-08
0.7560321.8869681.721621e-08
0.7596871.8867231.717180e-08
0.7633591.886481.712718e-08
0.7670491.8862391.708235e-08
0.7707571.8860011.703730e-08
0.7744831.8857641.699203e-08
0.7782271.885531.694654e-08
0.7819891.8852971.690083e-08
0.7857691.8850671.685490e-08
0.7895681.8848381.680875e-08
0.7933851.8846111.676238e-08
0.797221.8843871.671578e-08
0.8010741.8841641.666895e-08
0.8049461.8839431.662190e-08
0.8088371.8837231.657463e-08
0.8127471.8835061.652712e-08
0.8166761.883291.647938e-08
0.8206241.8830761.643142e-08
0.8245911.8828641.638322e-08
0.8285771.8826531.633479e-08
0.8325831.8824441.628612e-08
0.8366071.8822371.623722e-08
0.8406521.8820311.618808e-08
0.8447151.8818271.613871e-08
0.8487991.8816251.608909e-08
0.8529021.8814231.603924e-08
0.8570251.8812241.598915e-08
0.8611681.8810261.593881e-08
0.8653311.8808291.588823e-08
0.8695141.8806341.583741e-08
0.8737171.8804411.578634e-08
0.8779411.8802481.573502e-08
0.8821851.8800571.568345e-08
0.8864491.8798681.563164e-08
0.8907351.879681.557957e-08
0.895041.8794931.552726e-08
0.8993671.8793071.547469e-08
0.9037151.8791231.542187e-08
0.9080831.878941.536879e-08
0.9124731.8787581.531545e-08
0.9168841.8785771.526186e-08
0.9213161.8783981.520801e-08
0.925771.878221.515389e-08
0.9302451.8780431.509952e-08
0.9347421.8778671.504488e-08
0.9392611.8776921.498998e-08
0.9438011.8775181.493481e-08
0.9483641.8773451.487938e-08
0.9529481.8771741.482368e-08
0.9575551.8770031.476771e-08
0.9621841.8768341.471147e-08
0.9668351.8766651.465496e-08
0.9715091.8764981.459817e-08
0.9762051.8763311.454111e-08
0.9809241.8761651.448377e-08
0.9856661.8760011.442616e-08
0.9904311.8758371.436827e-08
0.9952191.8756741.431010e-08
1.000031.8755121.425164e-08
1.004861.8753511.419291e-08
1.009721.875191.413389e-08
1.01461.8750311.407458e-08
1.019511.8748721.401499e-08
1.024441.8747141.395511e-08
1.029391.8745571.389494e-08
1.034361.8744011.383448e-08
1.039361.8742451.377373e-08
1.044391.874091.371268e-08
1.049441.8739361.365134e-08
1.054511.8737831.358970e-08
1.059611.873631.352777e-08
1.061.8736181.352300e-08
1.064731.8734781.452729e-08
1.069881.8733261.562017e-08
1.075051.8731751.671833e-08
1.080251.8730251.782180e-08
1.085471.8728751.893061e-08
1.090711.8727262.004478e-08
1.095991.8725782.116433e-08
1.101291.872432.228929e-08
1.106611.8722822.341969e-08
1.111961.8721352.455556e-08
1.117331.8719892.569692e-08
1.122741.8718432.684379e-08
1.128161.8716972.799621e-08
1.133621.8715522.915420e-08
1.13911.8714083.031779e-08
1.14461.8712643.148700e-08
1.150141.871123.266186e-08
1.15571.8709773.384241e-08
1.161281.8708343.502866e-08
1.16691.8706913.622064e-08
1.172541.8705493.741839e-08
1.17821.8704073.862192e-08
1.18391.8702663.983128e-08
1.189621.8701244.104648e-08
1.195371.8699834.226756e-08
1.201151.8698434.349453e-08
1.206961.8697024.472744e-08
1.212791.8695624.596631e-08
1.218661.8694224.721117e-08
1.224551.8692824.846205e-08
1.230471.8691434.971897e-08
1.236421.8690045.098197e-08
1.242391.8688655.225107e-08
1.24841.8687265.352631e-08
1.254431.8685875.480772e-08
1.26051.8684485.609531e-08
1.266591.868315.738914e-08
1.272711.8681715.868921e-08
1.278871.8680335.999558e-08
1.285051.8678956.130825e-08
1.291261.8677566.262727e-08
1.29751.8676186.395267e-08
1.303771.867486.528448e-08
1.310081.8673426.662272e-08
1.316411.8672046.796744e-08
1.322771.8670666.931865e-08
1.329171.8669287.067639e-08
1.335591.866797.204070e-08
1.342051.8666517.341161e-08
1.348541.8665137.478914e-08
1.355061.8663757.617333e-08
1.361611.8662367.756421e-08
1.368191.8660987.896181e-08
1.37481.8659598.036617e-08
1.381451.865828.177732e-08
1.388131.8656818.319529e-08
1.394841.8655428.462012e-08
1.401581.8654038.605183e-08
1.408351.8652648.749047e-08
1.415161.8651248.893606e-08
1.4221.8649849.038864e-08
1.428881.8648449.184823e-08
1.435781.8647049.331489e-08
1.442731.8645639.478863e-08
1.44971.8644229.626950e-08
1.456711.8642819.775753e-08
1.463751.8641399.925275e-08
1.470831.8639971.007552e-07
1.477941.8638551.022649e-07
1.485081.8637131.037819e-07
1.492261.863571.053063e-07
1.499471.8634261.068380e-07
1.506721.8632831.083771e-07
1.5141.8631391.099237e-07
1.521321.8629941.114777e-07
1.528681.8628491.130392e-07
1.531.8628231.133200e-07
1.536071.8627041.218341e-07
1.543491.8625581.322539e-07
1.550951.8624121.427241e-07
1.558451.8622651.532448e-07
1.565991.8621171.638164e-07
1.573561.8619691.744392e-07
1.581161.8618211.851133e-07
1.588811.8616721.958389e-07
1.596491.8615222.066165e-07
1.60421.8613722.174461e-07
1.611961.8612212.283281e-07
1.619751.861072.392626e-07
1.627581.8609172.502501e-07
1.635451.8607652.612906e-07
1.643351.8606112.723846e-07
1.65131.8604572.835321e-07
1.659281.8603022.947336e-07
1.66731.8601473.059892e-07
1.675361.859993.172992e-07
1.683461.8598333.286638e-07
1.69161.8596753.400834e-07
1.699781.8595173.515583e-07
1.707991.8593573.630885e-07
1.716251.8591973.746746e-07
1.724551.8590363.863166e-07
1.732881.8588743.980149e-07
1.741261.8587114.097698e-07
1.749681.8585474.215815e-07
1.758131.8583824.334502e-07
1.766631.8582174.453764e-07
1.775171.858054.573602e-07
1.783761.8578824.694020e-07
1.792381.8577144.815019e-07
1.801041.8575444.936603e-07
1.809751.8573745.058776e-07
1.81851.8572025.181538e-07
1.827291.8570295.304895e-07
1.836121.8568565.428847e-07
1.8451.8566815.553399e-07
1.853921.8565055.678553e-07
1.862881.8563285.804312e-07
1.871881.8561495.930678e-07
1.880931.855976.057656e-07
1.890021.8557896.185247e-07
1.899161.8556076.313456e-07
1.908341.8554246.442284e-07
1.917571.855246.571734e-07
1.926841.8550546.701811e-07
1.936151.8548676.832516e-07
1.945511.8546786.963853e-07
1.954921.8544897.095825e-07
1.964371.8542987.228435e-07
1.971.8541847.307500e-07
1.973861.8541057.709275e-07
1.98341.8539118.702065e-07
1.992991.8537169.699654e-07
2.002631.8535191.070207e-06
2.012311.8533211.170932e-06
2.022031.8531211.272145e-06
2.031811.852921.373847e-06
2.041631.8527171.476040e-06
2.05151.8525131.578728e-06
2.061421.8523071.681912e-06
2.071381.8520991.785595e-06
2.08141.851891.889779e-06
2.091461.8516791.994466e-06
2.101571.8514672.099660e-06
2.111731.8512522.205362e-06
2.121931.8510362.311575e-06
2.132191.8508182.418302e-06
2.14251.8505992.525544e-06
2.152861.8503772.633305e-06
2.163261.8501542.741587e-06
2.173721.8499292.850393e-06
2.184231.8497012.959724e-06
2.194791.8494723.069584e-06
2.20541.8492413.179975e-06
2.216061.8490083.290899e-06
2.226771.8487733.402360e-06
2.237541.8485363.514359e-06
2.248351.8482973.626900e-06
2.259221.8480563.739985e-06
2.270141.8478133.853617e-06
2.281121.8475673.967798e-06
2.292141.8473194.082531e-06
2.303221.8470694.197818e-06
2.314361.8468174.313663e-06
2.3251.8465754.424400e-06
2.325541.8465634.447033e-06
2.336791.8463064.914090e-06
2.348081.8460475.383405e-06
2.359431.8457855.854989e-06
2.370841.8455216.328853e-06
2.38231.8452556.805007e-06
2.393821.8449867.283463e-06
2.405391.8447147.764232e-06
2.417021.844448.247325e-06
2.42871.8441648.732753e-06
2.440441.8438849.220528e-06
2.452241.8436029.710661e-06
2.464091.8433181.020316e-05
2.4761.843031.069805e-05
2.487971.842741.119532e-05
2.51.8424471.169500e-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
—