Optical constants

Refractive index of N-LAF2 (SCHOTT)

N-LAF2: n,k 0.35–2.5 µm

Data
formula 2 + tabulated k
Range
0.35–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.35–2.5 µm
Refractive index n
1.74397
Extinction coefficient k
1.35168e-08
Permittivity ε1
3.04143
Permittivity ε2
4.71457e-08
Absorption coefficient α
0.00289069 cm⁻¹
Penetration depth δ = λ/(2πk)
6.91877e+09 nm
Abbe number Vd
44.85
Chromatic dispersion dn/dλ
-0.084791 µm⁻¹
Group index ng
1.79379
Group velocity dispersion
158.412 fs²/mm
Dispersion parameter D
-864.22 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-LAF2 (SCHOTT): N-LAF2
schott_n_laf2 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-LAF2", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_laf2.range_nm)  # (350, 2500) nm
eps = schott_n_laf2.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=1.80984227λ2λ2−0.0101711622+0.15729555λ2λ2−0.0442431765+1.0930037λ2λ2−100.687748

Valid from 0.35 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.80984227
C30.0101711622
C40.15729555
C50.0442431765
C61.0930037
C7100.687748

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -3.64e-06 9.2e-09 -6e-12 6.43e-07 6.11e-10 0.22
nd
1.74397
Vd
44.85
glass code
744449.430
glass status
standard
density
value: 4295
thermal expansion
value: 8.06e-06, temperature range: 243 343; value: 9.1e-06, temperature range: 293 573
dPgF
-0.0027
resistance
acid: 52.2; stain: 3.0; alkali: 1.0; climatic: 2.0; phosphate: 2.2

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = -1.06e-06 K⁻¹ at 633 nm, dn/dT = -1.86e-06 K⁻¹ at 1310 nm, dn/dT = -1.91e-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 419 wavelengths, the same grid as the API and the library
N-LAF2 (SCHOTT), N-LAF2: n and k versus wavelength
λ (µm)nk
0.351.7940494.109700e-06
0.3517291.7931793.792847e-06
0.3534661.7923223.474429e-06
0.3552121.7914773.154438e-06
0.3569671.7906452.832867e-06
0.358731.7898252.509707e-06
0.3605021.7890172.184950e-06
0.3622831.7882211.858590e-06
0.3640731.7874361.530617e-06
0.3651.7870351.360700e-06
0.3658711.7866621.296797e-06
0.3676791.7858991.164241e-06
0.3694951.7851481.031031e-06
0.371.7849419.939800e-07
0.371321.7844069.365432e-07
0.3731541.7836758.567339e-07
0.3749981.7829547.765303e-07
0.376851.7822446.959306e-07
0.3787121.7815436.149327e-07
0.381.7810655.588700e-07
0.3805821.7808515.461660e-07
0.3824621.7801695.051485e-07
0.3843521.7794964.639283e-07
0.386251.7788324.225046e-07
0.3881581.7781783.808762e-07
0.391.7775573.406900e-07
0.3900761.7775313.397935e-07
0.3920021.7768943.169214e-07
0.3939391.7762652.939364e-07
0.3958851.7756442.708378e-07
0.397841.7750312.476251e-07
0.3998061.7744272.242977e-07
0.41.7743672.219900e-07
0.4017811.773832.095156e-07
0.4037651.7732411.956108e-07
0.4051.7728791.869600e-07
0.405761.7726591.835058e-07
0.4077641.7720851.743926e-07
0.4097781.7715181.652345e-07
0.4118031.7709591.560311e-07
0.4138371.7704061.467822e-07
0.4158811.7698611.374877e-07
0.4179351.7693221.281472e-07
0.421.768791.187606e-07
0.421.768791.187600e-07
0.4220751.7682651.144959e-07
0.424161.7677461.102104e-07
0.4262551.7672341.059037e-07
0.428361.7667281.015758e-07
0.4304761.7662289.722650e-08
0.4326031.7657359.285572e-08
0.434741.7652478.846334e-08
0.4361.7649638.587300e-08
0.4368871.7647658.479541e-08
0.4390451.7642898.217437e-08
0.4412141.7638197.954039e-08
0.4433941.7633557.689339e-08
0.4455841.7628967.423332e-08
0.4477851.7624427.156011e-08
0.4499971.7619946.887370e-08
0.452221.7615526.617401e-08
0.4544541.7611146.346099e-08
0.4566991.7606826.073457e-08
0.4589551.7602555.799468e-08
0.461.7600595.672500e-08
0.4612221.7598325.582596e-08
0.46351.7594155.414934e-08
0.465791.7590025.246444e-08
0.468091.7585955.077121e-08
0.4704031.7581924.906962e-08
0.4727261.7577944.735963e-08
0.4750621.75744.564119e-08
0.4774081.7570114.391426e-08
0.4797671.7566264.217880e-08
0.4821361.7562454.043476e-08
0.4845181.7558693.868212e-08
0.4869121.7554973.692081e-08
0.4893171.755133.515080e-08
0.4917341.7547663.337205e-08
0.4941631.7544073.158452e-08
0.4966041.7540522.978815e-08
0.4990571.75372.798291e-08
0.51.7535672.728900e-08
0.5015221.7533532.673204e-08
0.5041.7530092.582564e-08
0.5064891.7526692.491475e-08
0.5089911.7523332.399937e-08
0.5115061.7522.307947e-08
0.5140321.7516722.215502e-08
0.5165711.7513462.122600e-08
0.5191231.7510252.029240e-08
0.5216881.7507071.935419e-08
0.5242651.7503921.841133e-08
0.5268541.7500811.746383e-08
0.5294571.7497731.651164e-08
0.5320721.7494681.555475e-08
0.5347011.7491671.459313e-08
0.5373421.7488681.362676e-08
0.5399961.7485731.265562e-08
0.5426641.7482821.167968e-08
0.5453441.7479931.069892e-08
0.5461.7479231.045900e-08
0.5480381.7477071.060946e-08
0.5507451.7474241.080932e-08
0.5534661.7471441.101016e-08
0.55621.7468681.121199e-08
0.5589471.7465941.141482e-08
0.5617081.7463231.161865e-08
0.5644831.7460541.182349e-08
0.5672721.7457891.202934e-08
0.5700741.7455261.223621e-08
0.572891.7452661.244410e-08
0.575721.7450081.265301e-08
0.5785641.7447541.286296e-08
0.581.7446261.296900e-08
0.5814221.7445011.307146e-08
0.5842941.7442521.327846e-08
0.587181.7440051.348649e-08
0.590081.743761.369555e-08
0.5929951.7435181.390564e-08
0.5959251.7432781.411676e-08
0.5988681.7430411.432893e-08
0.6018271.7428061.454215e-08
0.6047991.7425731.475642e-08
0.6077871.7423431.497175e-08
0.6107891.7421151.518814e-08
0.6138061.7418891.540560e-08
0.6168391.7416651.562414e-08
0.6198861.7414441.584375e-08
0.621.7414361.585200e-08
0.6229481.7412241.577138e-08
0.6260251.7410071.568722e-08
0.6291171.7407921.560264e-08
0.6322251.7405791.551765e-08
0.6353481.7403681.543223e-08
0.6384861.7401591.534639e-08
0.641641.7399521.526013e-08
0.644811.7397471.517345e-08
0.6479951.7395441.508633e-08
0.6511961.7393431.499879e-08
0.6544131.7391441.491081e-08
0.6576461.7389461.482239e-08
0.661.7388041.475800e-08
0.6608941.7387511.462773e-08
0.6641591.7385571.415211e-08
0.667441.7383651.367414e-08
0.6707371.7381751.319381e-08
0.674051.7379861.271111e-08
0.677381.73781.222602e-08
0.6807261.7376151.173854e-08
0.6840881.7374311.124865e-08
0.6874671.737251.075633e-08
0.6908631.7370691.026159e-08
0.6942761.7368919.764401e-09
0.6977061.7367149.264758e-09
0.71.7365978.930500e-09
0.7011521.7365398.934361e-09
0.7046161.7363658.945969e-09
0.7080961.7361928.957634e-09
0.7115941.7360228.969356e-09
0.7151091.7358528.981137e-09
0.7186421.7356848.992976e-09
0.7221921.7355189.004873e-09
0.7257591.7353539.016829e-09
0.7293441.7351899.028844e-09
0.7329471.7350279.040918e-09
0.7365681.7348669.053052e-09
0.7402061.7347079.065246e-09
0.7438621.7345499.077500e-09
0.7475371.7343929.089815e-09
0.751231.7342369.102190e-09
0.754941.7340829.114627e-09
0.758671.7339299.127125e-09
0.7624171.7337779.139685e-09
0.7661841.7336269.152307e-09
0.7699681.7334779.164991e-09
0.7737721.7333289.177738e-09
0.7775941.7331819.190548e-09
0.7814351.7330359.203421e-09
0.7852951.7328919.216358e-09
0.7891741.7327479.229358e-09
0.7930731.7326049.242423e-09
0.796991.7324639.255552e-09
0.8009271.7323229.268747e-09
0.8048841.7321839.282006e-09
0.808861.7320449.295331e-09
0.8128551.7319079.308722e-09
0.816871.7317719.322178e-09
0.8209061.7316359.335702e-09
0.8249611.7315019.349292e-09
0.8290361.7313689.362949e-09
0.8331311.7312359.376674e-09
0.8372471.7311039.390466e-09
0.8413821.7309739.404327e-09
0.8455391.7308439.418256e-09
0.8497151.7307149.432254e-09
0.8539131.7305869.446321e-09
0.8581311.7304599.460458e-09
0.862371.7303339.474664e-09
0.866631.7302079.488941e-09
0.8709111.7300829.503288e-09
0.8752131.7299589.517706e-09
0.8795361.7298359.532195e-09
0.8838811.7297139.546756e-09
0.8882471.7295919.561389e-09
0.8926351.7294719.576094e-09
0.8970441.729359.590871e-09
0.9014751.7292319.605722e-09
0.9059281.7291129.620646e-09
0.9104031.7289949.635644e-09
0.9149011.7288779.650715e-09
0.919421.728769.665862e-09
0.9239621.7286449.681083e-09
0.9285261.7285299.696379e-09
0.9331131.7284149.711751e-09
0.9377221.72839.727198e-09
0.9423541.7281879.742722e-09
0.9470091.7280749.758323e-09
0.9516871.7279619.774001e-09
0.9563881.727859.789756e-09
0.9611121.7277389.805589e-09
0.965861.7276289.821501e-09
0.9706311.7275189.837490e-09
0.9754261.7274089.853559e-09
0.9802441.7272999.869708e-09
0.9850861.727199.885936e-09
0.9899531.7270829.902244e-09
0.9948431.7269749.918632e-09
0.9997571.7268679.935102e-09
1.00471.7267619.951653e-09
1.009661.7266549.968286e-09
1.014651.7265489.985001e-09
1.019661.7264431.000180e-08
1.024691.7263381.001868e-08
1.029761.7262331.003564e-08
1.034841.7261291.005269e-08
1.039961.7260251.006982e-08
1.045091.7259211.008704e-08
1.050251.7258181.010434e-08
1.055441.7257151.012173e-08
1.061.7256261.013700e-08
1.060661.7256131.019122e-08
1.06591.725511.062386e-08
1.071161.7254091.105863e-08
1.076451.7253071.149556e-08
1.081771.7252061.193464e-08
1.087111.7251041.237589e-08
1.092481.7250041.281933e-08
1.097881.7249031.326495e-08
1.10331.7248031.371277e-08
1.108751.7247031.416281e-08
1.114231.7246031.461507e-08
1.119731.7245031.506956e-08
1.125271.7244041.552630e-08
1.130821.7243041.598529e-08
1.136411.7242051.644655e-08
1.142021.7241061.691009e-08
1.147671.7240081.737592e-08
1.153331.7239091.784405e-08
1.159031.7238111.831449e-08
1.164761.7237121.878726e-08
1.170511.7236141.926236e-08
1.176291.7235161.973981e-08
1.18211.7234182.021962e-08
1.187941.723322.070180e-08
1.193811.7232222.118636e-08
1.199711.7231242.167331e-08
1.205631.7230262.216267e-08
1.211591.7229282.265445e-08
1.217571.7228312.314865e-08
1.223591.7227332.364530e-08
1.229631.7226352.414440e-08
1.235711.7225382.464596e-08
1.241811.722442.515001e-08
1.247951.7223422.565654e-08
1.254111.7222452.616557e-08
1.260311.7221472.667712e-08
1.266531.7220492.719120e-08
1.272791.7219512.770781e-08
1.279071.7218532.822698e-08
1.285391.7217552.874871e-08
1.291741.7216572.927302e-08
1.298121.7215592.979992e-08
1.304541.7214613.032943e-08
1.310981.7213623.086154e-08
1.317461.7212643.139629e-08
1.323961.7211653.193368e-08
1.33051.7210663.247372e-08
1.337081.7209673.301643e-08
1.343681.7208683.356182e-08
1.350321.7207683.410991e-08
1.356991.7206693.466070e-08
1.363691.7205693.521421e-08
1.370431.7204693.577046e-08
1.37721.7203693.632946e-08
1.3841.7202683.689121e-08
1.390841.7201673.745574e-08
1.397711.7200663.802306e-08
1.404611.7199653.859319e-08
1.411551.7198633.916613e-08
1.418521.7197623.974189e-08
1.425531.7196594.032051e-08
1.432571.7195574.090198e-08
1.439651.7194544.148632e-08
1.446761.7193514.207355e-08
1.453911.7192484.266368e-08
1.461091.7191444.325673e-08
1.468311.719044.385271e-08
1.475561.7189354.445163e-08
1.482851.718834.505350e-08
1.490171.7187254.565835e-08
1.497531.7186194.626619e-08
1.504931.7185124.687704e-08
1.512371.7184064.749089e-08
1.519841.7182994.810779e-08
1.527341.7181914.872772e-08
1.531.7181534.894700e-08
1.534891.7180835.345980e-08
1.542471.7179746.045802e-08
1.550091.7178656.749082e-08
1.557751.7177567.455835e-08
1.565441.7176468.166080e-08
1.573181.7175358.879833e-08
1.580951.7174249.597112e-08
1.588761.7173121.031793e-07
1.59661.71721.104232e-07
1.604491.7170871.177028e-07
1.612421.7169741.250184e-07
1.620381.7168591.323701e-07
1.628391.7167451.397581e-07
1.636431.7166291.471826e-07
1.644511.7165131.546438e-07
1.652641.7163971.621419e-07
1.66081.7162791.696769e-07
1.6691.7161611.772493e-07
1.677251.7160431.848590e-07
1.685531.7159231.925063e-07
1.693861.7158032.001914e-07
1.702231.7156822.079144e-07
1.710641.7155612.156756e-07
1.719091.7154382.234751e-07
1.727581.7153152.313132e-07
1.736111.7151912.391900e-07
1.744691.7150662.471057e-07
1.753311.7149412.550604e-07
1.761971.7148142.630545e-07
1.770671.7146872.710881e-07
1.779421.7145592.791614e-07
1.788211.714432.872745e-07
1.797041.71432.954277e-07
1.805921.7141693.036212e-07
1.814841.7140373.118552e-07
1.82381.7139043.201298e-07
1.832811.7137713.284453e-07
1.841871.7136363.368019e-07
1.850961.71353.451998e-07
1.860111.7133643.536391e-07
1.86931.7132263.621202e-07
1.878531.7130873.706431e-07
1.887811.7129473.792081e-07
1.897141.7128073.878155e-07
1.906511.7126653.964653e-07
1.915921.7125224.051579e-07
1.925391.7123774.138935e-07
1.93491.7122324.226722e-07
1.944461.7120864.314942e-07
1.954061.7119384.403598e-07
1.963721.7117894.492692e-07
1.971.7116924.550700e-07
1.973421.7116394.771133e-07
1.983161.7114885.400244e-07
1.992961.7113356.032462e-07
2.00281.7111826.667803e-07
2.01271.7110277.306283e-07
2.022641.710877.947916e-07
2.032631.7107138.592720e-07
2.042671.7105549.240708e-07
2.052761.7103939.891897e-07
2.06291.7102321.054630e-06
2.073091.7100681.120394e-06
2.083331.7099041.186483e-06
2.093631.7097381.252898e-06
2.103971.709571.319641e-06
2.114361.7094011.386714e-06
2.12481.7092311.454119e-06
2.13531.7090591.521856e-06
2.145851.7088851.589928e-06
2.156451.708711.658336e-06
2.16711.7085341.727082e-06
2.177811.7083551.796167e-06
2.188561.7081751.865594e-06
2.199371.7079941.935364e-06
2.210241.7078112.005478e-06
2.221161.7076262.075939e-06
2.232131.7074392.146748e-06
2.243161.707252.217907e-06
2.254241.707062.289417e-06
2.265371.7068682.361280e-06
2.276561.7066742.433499e-06
2.287811.7064792.506074e-06
2.299111.7062812.579008e-06
2.310471.7060822.652301e-06
2.321881.705882.725957e-06
2.3251.7058252.746100e-06
2.333351.7056772.962944e-06
2.344871.7054713.262328e-06
2.356461.7052643.563191e-06
2.36811.7050553.865541e-06
2.37981.7048434.169384e-06
2.391551.7046294.474728e-06
2.403371.7044144.781580e-06
2.415241.7041965.089948e-06
2.427171.7039765.399840e-06
2.439161.7037535.711262e-06
2.451211.7035296.024222e-06
2.463311.7033026.338729e-06
2.475481.7030736.654789e-06
2.487711.7028426.972410e-06
2.51.7026087.291600e-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
—