Optical constants

Refractive index of H-LAK6A (CDGM)

H-LAK6A: n,k 0.302–2.325 µm

Data
formula 2 + tabulated k
Range
0.302–2.325 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength. Note: k data cover 320-2400 nm only; k = 0 elsewhere in the n range 302-2325 nm.

At one wavelength

Range 0.302–2.325 µm
Refractive index n
1.6935
Extinction coefficient k
1.04495e-08
Permittivity ε1
2.86793
Permittivity ε2
3.53924e-08
Absorption coefficient α
0.00223472 cm⁻¹
Penetration depth δ = λ/(2πk)
8.94966e+09 nm
Abbe number Vd
53.38
Chromatic dispersion dn/dλ
-0.0670245 µm⁻¹
Group index ng
1.73288
Group velocity dispersion
117.653 fs²/mm
Dispersion parameter D
-641.858 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

# H-LAK6A (CDGM): H-LAK6A
cdgm_h_lak6a = ls.fetch_refractiveindex("specs", "CDGM-optical", "H-LAK6A", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_h_lak6a.range_nm)  # (302, 2325) nm
eps = cdgm_h_lak6a.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=1.13018444λ2λ2−81.4541493+1.60589λ2λ2−0.00817222723+0.207868982λ2λ2−0.030380314

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.13018444
C381.4541493
C41.60589
C50.00817222723
C60.207868982
C70.030380314

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 2.73e-06 1.81e-08 4.81e-11 6.35e-07 -7.14e-10 0.117
nd
1.693500
Vd
53.380441
glass code
694534
density
value: 3590
thermal expansion
value: 5.6e-06, temperature range: 243 343; value: 7.3e-06, temperature range: 293 573
dPgF
-0.0082
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 2.40e-06 K⁻¹ at 633 nm, dn/dT = 1.67e-06 K⁻¹ at 1310 nm, dn/dT = 1.60e-06 K⁻¹ at 1550 nm
Notes on the source data (kept exactly as published):
  • k data cover 320-2400 nm only; k = 0 elsewhere in the n range 302-2325 nm

References

Cite

CDGM Zemax catalog 2022-06 (obtained from http://www.cdgmgd.com); See also CDGM optical 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 430 wavelengths, the same grid as the API and the library
H-LAK6A (CDGM), H-LAK6A: n and k versus wavelength
λ (µm)nk
0.3021.753390
0.3035491.7524330
0.3051061.751490
0.306671.7505620
0.3082431.7496480
0.3098241.7487480
0.3114131.7478610
0.313011.7469870
0.3146151.7461260
0.3162291.7452770
0.317851.7444410
0.3194811.7436180
0.321.7433589.961900e-06
0.3211191.7428069.292070e-06
0.3227661.7420058.306306e-06
0.3244211.7412167.315488e-06
0.3260851.7404396.319587e-06
0.3277571.7396725.318580e-06
0.3294381.7389164.312438e-06
0.331.7386673.976200e-06
0.3311281.7381713.715792e-06
0.3328261.7374363.323679e-06
0.3345331.7367112.929556e-06
0.3362491.7359962.533410e-06
0.3379731.7352912.135233e-06
0.3397061.7345961.735015e-06
0.341.734481.667200e-06
0.3414481.733911.536424e-06
0.34321.7332341.378326e-06
0.344961.7325671.219417e-06
0.3467291.7319081.059692e-06
0.3485071.7312598.991489e-07
0.351.7307227.643600e-07
0.3502941.7306187.542846e-07
0.3520911.7299856.927979e-07
0.3538971.7293616.309959e-07
0.3557121.7287465.688769e-07
0.3575361.7281385.064394e-07
0.3593691.7275384.436816e-07
0.361.7273344.221000e-07
0.3612121.7269463.999130e-07
0.3630651.7263623.660144e-07
0.3649271.7257853.319420e-07
0.3667981.7252162.976948e-07
0.368681.7246542.632720e-07
0.371.7242652.391100e-07
0.370571.7240992.341374e-07
0.3724711.7235512.175691e-07
0.3743811.7230112.009158e-07
0.3763011.7224771.841770e-07
0.3782311.721951.673525e-07
0.381.7214751.519300e-07
0.3801711.7214291.511141e-07
0.382121.7209151.417964e-07
0.384081.7204071.324310e-07
0.386051.7199061.230175e-07
0.388031.7194111.135557e-07
0.391.7189271.041400e-07
0.390021.7189221.040869e-07
0.392021.7184399.872354e-08
0.394031.7179629.333264e-08
0.3960511.7174918.791409e-08
0.3980821.7170268.246775e-08
0.41.7165937.732600e-08
0.4001241.7165667.720187e-08
0.4021761.7161127.514788e-08
0.4042391.7156637.308335e-08
0.4063121.715227.100824e-08
0.4083961.7147826.892248e-08
0.410491.7143496.682603e-08
0.4125951.7139216.471883e-08
0.4147111.7134996.260082e-08
0.4168381.7130816.047194e-08
0.4189761.7126695.833215e-08
0.421.7124745.730700e-08
0.4211251.7122615.666095e-08
0.4232841.7118585.542018e-08
0.4254551.711465.417304e-08
0.4276371.7110675.291951e-08
0.429831.7106785.165955e-08
0.4320351.7102935.039313e-08
0.434251.7099134.912021e-08
0.4364771.7095384.784076e-08
0.4387161.7091674.655475e-08
0.441.7089574.581700e-08
0.4409661.70884.538109e-08
0.4432271.7084374.436036e-08
0.44551.7080784.333440e-08
0.4477851.7077244.230317e-08
0.4500821.7073734.126666e-08
0.452391.7070274.022483e-08
0.454711.7066843.917766e-08
0.4570421.7063463.812512e-08
0.4593861.7060113.706718e-08
0.461.7059243.679000e-08
0.4617421.7056793.592273e-08
0.464111.7053523.474368e-08
0.466491.7050283.355858e-08
0.4688831.7047083.236740e-08
0.4712871.7043913.117011e-08
0.4737041.7040782.996669e-08
0.4761341.7037682.875709e-08
0.4785751.7034622.754129e-08
0.481.7032852.683200e-08
0.481031.7031592.668335e-08
0.4834971.7028592.632724e-08
0.4859761.7025632.596931e-08
0.4884691.7022692.560954e-08
0.4909741.7019792.524792e-08
0.4934921.7016922.488445e-08
0.4960231.7014082.451912e-08
0.4985671.7011282.415192e-08
0.51.7009712.394500e-08
0.5011231.700852.370244e-08
0.5036931.7005752.314757e-08
0.5062771.7003032.258986e-08
0.5088731.7000342.202929e-08
0.5114831.6997682.146584e-08
0.5141061.6995042.089950e-08
0.5167431.6992432.033026e-08
0.5193931.6989851.975810e-08
0.5220561.698731.918300e-08
0.5247341.6984771.860496e-08
0.5274251.6982271.802395e-08
0.530131.697981.743996e-08
0.5328491.6977351.685297e-08
0.5355811.6974931.626298e-08
0.5383281.6972531.566996e-08
0.5410891.6970151.507390e-08
0.5438641.696781.447478e-08
0.5466531.6965481.387259e-08
0.5494571.6963171.326731e-08
0.551.6962731.315000e-08
0.5522751.6960891.298664e-08
0.5551071.6958631.278321e-08
0.5579541.695641.257874e-08
0.5608151.6954191.237323e-08
0.5636911.6951991.216666e-08
0.5665821.6949831.195903e-08
0.5694881.6947681.175033e-08
0.5724091.6945551.154057e-08
0.5753441.6943441.132972e-08
0.5782951.6941361.111780e-08
0.5812611.6939291.090479e-08
0.5842421.6937241.069069e-08
0.5872381.6935221.047549e-08
0.590251.6933211.025919e-08
0.5932771.6931221.004177e-08
0.5963191.6929259.823247e-09
0.5993781.692739.603599e-09
0.61.6926919.558900e-09
0.6024521.6925379.597934e-09
0.6055411.6923459.647128e-09
0.6086471.6921569.696574e-09
0.6117681.6919689.746274e-09
0.6149061.6917829.796228e-09
0.6180591.6915979.846439e-09
0.6212291.6914149.896908e-09
0.6244151.6912339.947635e-09
0.6276171.6910539.998622e-09
0.6308361.6908761.004987e-08
0.6340711.6906991.010138e-08
0.6373231.6905241.015316e-08
0.6405921.6903511.020520e-08
0.6438771.6901791.025751e-08
0.6471791.6900091.031008e-08
0.651.6898661.035500e-08
0.6504981.689841.036294e-08
0.6538341.6896731.041612e-08
0.6571871.6895071.046957e-08
0.6605581.6893431.052329e-08
0.6639451.689181.057729e-08
0.6673511.6890181.063157e-08
0.6707731.6888581.068612e-08
0.6742131.6886991.074096e-08
0.6776711.6885411.079607e-08
0.6811461.6883851.085147e-08
0.684641.688231.090715e-08
0.6881511.6880761.096312e-08
0.691681.6879231.101938e-08
0.6952271.6877721.107592e-08
0.6987931.6876221.113276e-08
0.71.6875711.115200e-08
0.7023761.6874721.118986e-08
0.7059791.6873251.124724e-08
0.7095991.6871781.130492e-08
0.7132381.6870321.136289e-08
0.7168961.6868881.142116e-08
0.7205731.6867441.147973e-08
0.7242681.6866021.153860e-08
0.7279831.6864611.159777e-08
0.7317161.6863211.165724e-08
0.7354691.6861811.171702e-08
0.7392411.6860431.177711e-08
0.7430321.6859061.183750e-08
0.7468431.685771.189820e-08
0.7506731.6856341.195922e-08
0.7545231.68551.202055e-08
0.7583921.6853671.208219e-08
0.7622821.6852341.214415e-08
0.7661911.6851021.220642e-08
0.770121.6849721.226902e-08
0.774071.6848421.233194e-08
0.778041.6847131.239517e-08
0.782031.6845841.245874e-08
0.7860411.6844571.252263e-08
0.7900721.684331.258685e-08
0.7941241.6842051.265139e-08
0.7981961.6840791.271627e-08
0.81.6840251.274500e-08
0.802291.6839551.278150e-08
0.8064051.6838321.284709e-08
0.810541.6837091.291301e-08
0.8146971.6835871.297927e-08
0.8188751.6834651.304587e-08
0.8230751.6833441.311281e-08
0.8272961.6832241.318010e-08
0.8315391.6831051.324773e-08
0.8358031.6829861.331571e-08
0.840091.6828681.338403e-08
0.8443981.6827511.345271e-08
0.8487291.6826341.352174e-08
0.851.6825991.354200e-08
0.8530821.6825171.359106e-08
0.8574571.6824011.366071e-08
0.8618541.6822861.373072e-08
0.8662741.6821721.380108e-08
0.8707171.6820571.387181e-08
0.8751821.6819441.394290e-08
0.8796711.6818311.401436e-08
0.8841821.6817181.408618e-08
0.8887171.6816061.415837e-08
0.8932741.6814941.423093e-08
0.8978561.6813831.430386e-08
0.91.6813311.433800e-08
0.902461.6812721.437722e-08
0.9070881.6811621.445099e-08
0.9117411.6810521.452514e-08
0.9164161.6809421.459968e-08
0.9211161.6808331.467459e-08
0.925841.6807241.474989e-08
0.9305881.6806161.482558e-08
0.9353611.6805081.490165e-08
0.9401581.68041.497812e-08
0.944981.6802931.505497e-08
0.9498261.6801861.513222e-08
0.951.6801821.513500e-08
0.9546971.6800791.520978e-08
0.9595931.6799731.528772e-08
0.9645151.6798671.536607e-08
0.9694611.6797611.544482e-08
0.9744331.6796551.552397e-08
0.979431.679551.560353e-08
0.9844531.6794441.568350e-08
0.9895021.679341.576387e-08
0.9945771.6792351.584466e-08
0.9996781.679131.592587e-08
11.6791241.593100e-08
1.00481.6790261.600755e-08
1.009961.6789221.608966e-08
1.015141.6788181.617219e-08
1.020341.6787141.625514e-08
1.025581.678611.633851e-08
1.030841.6785061.642232e-08
1.036121.6784031.650655e-08
1.041441.67831.659122e-08
1.046781.6781961.667632e-08
1.052151.6780931.676185e-08
1.057541.677991.684783e-08
1.061.6779431.688700e-08
1.062971.6778871.693425e-08
1.068421.6777841.702113e-08
1.07391.6776811.710844e-08
1.07941.6775781.719621e-08
1.084941.6774751.728443e-08
1.09051.6773721.737309e-08
1.09611.6772691.746222e-08
1.101721.6771661.755180e-08
1.107371.6770631.764184e-08
1.113051.676961.773234e-08
1.118761.6768561.782330e-08
1.124491.6767531.791474e-08
1.130261.676651.800664e-08
1.136061.6765461.809901e-08
1.141881.6764431.819185e-08
1.147741.6763391.828518e-08
1.153621.6762351.837898e-08
1.159541.6761311.847326e-08
1.165491.6760271.856802e-08
1.171471.6759231.866328e-08
1.177471.6758191.875902e-08
1.183511.6757141.885525e-08
1.189581.6756091.895197e-08
1.195681.6755041.904919e-08
1.21.675431.911800e-08
1.201811.6753991.914690e-08
1.207981.6752931.924509e-08
1.214171.6751871.934377e-08
1.22041.6750811.944297e-08
1.226661.6749751.954267e-08
1.232951.6748681.964289e-08
1.239271.6747611.974361e-08
1.245631.6746541.984486e-08
1.252021.6745471.994662e-08
1.258441.6744392.004891e-08
1.264891.6743312.015172e-08
1.271381.6742222.025506e-08
1.27791.6741132.035893e-08
1.284451.6740042.046333e-08
1.291041.6738942.056826e-08
1.297661.6737842.067374e-08
1.304321.6736732.077975e-08
1.311011.6735622.088631e-08
1.317731.6734512.099342e-08
1.324491.6733392.110107e-08
1.331281.6732262.120928e-08
1.338111.6731132.131804e-08
1.344971.6732.142736e-08
1.351871.6728862.153724e-08
1.35881.6727712.164769e-08
1.365771.6726562.175870e-08
1.372771.6725412.187028e-08
1.379811.6724252.198243e-08
1.386891.6723082.209515e-08
1.3941.672192.220846e-08
1.41.6720912.230400e-08
1.401151.6720722.232235e-08
1.408341.6719542.243682e-08
1.415561.6718352.255187e-08
1.422821.6717152.266752e-08
1.430121.6715942.278376e-08
1.437451.6714732.290060e-08
1.444821.6713512.301803e-08
1.452231.6712282.313607e-08
1.459681.6711052.325472e-08
1.467171.6709812.337397e-08
1.474691.6708562.349383e-08
1.482251.670732.361431e-08
1.489861.6706042.373541e-08
1.49751.6704762.385712e-08
1.505181.6703482.397946e-08
1.51291.670222.410243e-08
1.520651.670092.422603e-08
1.528451.6699592.435027e-08
1.536291.6698282.447514e-08
1.544171.6696952.460065e-08
1.552091.6695622.472680e-08
1.560051.6694282.485360e-08
1.568051.6692922.498105e-08
1.576091.6691562.510916e-08
1.584181.6690192.523792e-08
1.59231.6688812.536735e-08
1.61.668752.549000e-08
1.600471.6687422.596947e-08
1.608671.6686023.440526e-08
1.616921.668464.288431e-08
1.625221.6683185.140685e-08
1.633551.6681755.997309e-08
1.641931.668036.858327e-08
1.650351.6678847.723760e-08
1.658811.6677388.593632e-08
1.667321.667599.467965e-08
1.675871.6674411.034678e-07
1.684471.667291.123011e-07
1.693111.6671391.211796e-07
1.701791.6669861.301037e-07
1.710521.6668321.390735e-07
1.719291.6666771.480894e-07
1.728111.666521.571515e-07
1.736971.6663621.662600e-07
1.745881.6662031.754153e-07
1.754831.6660421.846175e-07
1.763831.665881.938669e-07
1.772881.6657172.031638e-07
1.781971.6655522.125083e-07
1.791111.6653862.219008e-07
1.81.6652242.310400e-07
1.800291.6652182.318247e-07
1.809531.6650492.565290e-07
1.818811.6648782.813600e-07
1.828131.6647063.063183e-07
1.837511.6645323.314046e-07
1.846931.6643573.566196e-07
1.856411.664183.819639e-07
1.865931.6640024.074382e-07
1.87551.6638214.330431e-07
1.885111.6636394.587793e-07
1.894781.6634564.846476e-07
1.90451.6632715.106485e-07
1.914271.6630845.367827e-07
1.924081.6628955.630510e-07
1.933951.6627045.894540e-07
1.943871.6625126.159924e-07
1.953841.6623176.426668e-07
1.963861.6621216.694781e-07
1.973931.6619236.964269e-07
1.984051.6617237.235140e-07
1.994231.6615217.507399e-07
21.6614067.661800e-07
2.004461.6613178.111353e-07
2.014741.6611119.148245e-07
2.025071.6609031.019045e-06
2.035461.6606931.123801e-06
2.045891.6604811.229093e-06
2.056391.6602671.334926e-06
2.066931.660051.441301e-06
2.077531.6598321.548222e-06
2.088191.6596111.655692e-06
2.09891.6593881.763712e-06
2.109661.6591621.872286e-06
2.120481.6589341.981418e-06
2.131361.6587042.091109e-06
2.142291.6584722.201362e-06
2.153271.6582372.312181e-06
2.164321.6579992.423568e-06
2.175421.657762.535527e-06
2.186571.6575172.648059e-06
2.197791.6572722.761169e-06
2.21.6572242.783500e-06
2.209061.6570253.113804e-06
2.220391.6567743.526951e-06
2.231771.6565213.942217e-06
2.243221.6562664.359612e-06
2.254721.6560074.779149e-06
2.266291.6557465.200836e-06
2.277911.6554825.624687e-06
2.289591.6552156.050711e-06
2.301331.6549466.478920e-06
2.313141.6546736.909325e-06
2.3251.6543977.341938e-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
—