Optical constants

Refractive index of H-LAK8B (CDGM)

H-LAK8B: 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 310-2400 nm only; k = 0 elsewhere in the n range 302-2325 nm.

At one wavelength

Range 0.302–2.325 µm
Refractive index n
1.72
Extinction coefficient k
9.36134e-09
Permittivity ε1
2.95839
Permittivity ε2
3.22030e-08
Absorption coefficient α
0.00200201 cm⁻¹
Penetration depth δ = λ/(2πk)
9.98996e+09 nm
Abbe number Vd
50.281
Chromatic dispersion dn/dλ
-0.0736121 µm⁻¹
Group index ng
1.76325
Group velocity dispersion
133.028 fs²/mm
Dispersion parameter D
-725.738 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-LAK8B (CDGM): H-LAK8B
cdgm_h_lak8b = ls.fetch_refractiveindex("specs", "CDGM-optical", "H-LAK8B", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_h_lak8b.range_nm)  # (302, 2325) nm
eps = cdgm_h_lak8b.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=1.55351121λ2λ2−0.00793041249+0.342243754λ2λ2−0.0280174591+1.07011974λ2λ2−90.2590858

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.55351121
C30.00793041249
C40.342243754
C50.0280174591
C61.07011974
C790.2590858

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -2.05e-07 1.37e-08 -3.29e-11 4.91e-07 6.32e-10 0.249
nd
1.720000
Vd
50.280736
glass code
720503
density
value: 3880
thermal expansion
value: 7.6e-06, temperature range: 243 343; value: 9.1e-06, temperature range: 293 573
dPgF
-0.0068
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 7.06e-07 K⁻¹ at 633 nm, dn/dT = 5.10e-08 K⁻¹ at 1310 nm, dn/dT = 2.65e-09 K⁻¹ at 1550 nm
Notes on the source data (kept exactly as published):
  • k data cover 310-2400 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 431 wavelengths, the same grid as the API and the library
H-LAK8B (CDGM), H-LAK8B: n and k versus wavelength
λ (µm)nk
0.3021.7872810
0.3035491.7861950
0.3051061.7851270
0.306671.7840740
0.3082431.7830380
0.3098241.7820180
0.311.7819055.445100e-06
0.3114131.7810125.137653e-06
0.313011.7800224.790111e-06
0.3146151.7790464.440787e-06
0.3162291.7780854.089672e-06
0.317851.7771393.736755e-06
0.3194811.7762063.382029e-06
0.321.7759123.269000e-06
0.3211191.7752863.132017e-06
0.3227661.774382.930424e-06
0.3244211.7734872.727798e-06
0.3260851.7726072.524132e-06
0.3277571.7717392.319422e-06
0.3294381.7708842.113662e-06
0.331.7706022.044900e-06
0.3311281.7700411.956718e-06
0.3328261.769211.823936e-06
0.3345331.768391.690473e-06
0.3362491.7675821.556326e-06
0.3379731.7667851.421491e-06
0.3397061.7661.285964e-06
0.341.7658681.263000e-06
0.3414481.7652251.191304e-06
0.34321.764461.104629e-06
0.344961.7637071.017509e-06
0.3467291.7629639.299420e-07
0.3485071.762238.419262e-07
0.351.7616257.680300e-07
0.3502941.7615067.588295e-07
0.3520911.7607937.026819e-07
0.3538971.7600886.462465e-07
0.3557121.7593945.895216e-07
0.3575361.7587085.325058e-07
0.3593691.7580324.751976e-07
0.361.7578024.554900e-07
0.3612121.7573644.327562e-07
0.3630651.7567063.980221e-07
0.3649271.7560563.631099e-07
0.3667981.7554143.280187e-07
0.368681.7547812.927475e-07
0.371.7543442.679900e-07
0.370571.7541562.619149e-07
0.3724711.7535392.416729e-07
0.3743811.7529312.213271e-07
0.3763011.752332.008770e-07
0.3782311.7517361.803220e-07
0.381.7512021.614800e-07
0.3801711.751151.606108e-07
0.382121.7505721.506848e-07
0.384081.7500011.407080e-07
0.386051.7494371.306799e-07
0.388031.7488811.206004e-07
0.391.7483371.105700e-07
0.390021.7483311.105107e-07
0.392021.7477881.045138e-07
0.394031.7472539.848618e-08
0.3960511.7467239.242764e-08
0.3980821.7462018.633804e-08
0.41.7457158.058900e-08
0.4001241.7456848.042356e-08
0.4021761.7451747.768604e-08
0.4042391.7446717.493447e-08
0.4063121.7441737.216879e-08
0.4083961.7436826.938893e-08
0.410491.7431976.659481e-08
0.4125951.7427176.378636e-08
0.4147111.7422436.096351e-08
0.4168381.7417765.812619e-08
0.4189761.7413135.527431e-08
0.421.7410955.390800e-08
0.4211251.7408575.325368e-08
0.4232841.7404055.199704e-08
0.4254551.7399595.073395e-08
0.4276371.7395194.946438e-08
0.429831.7390844.818830e-08
0.4320351.7386534.690567e-08
0.434251.7382284.561647e-08
0.4364771.7378084.432065e-08
0.4387161.7373934.301819e-08
0.441.7371584.227100e-08
0.4409661.7369834.147147e-08
0.4432271.7365773.959929e-08
0.44551.7361773.771750e-08
0.4477851.7357813.582607e-08
0.4500821.7353893.392493e-08
0.452391.7350023.201405e-08
0.454711.734623.009336e-08
0.4570421.7342422.816283e-08
0.4593861.7338682.622239e-08
0.461.7337712.571400e-08
0.4617421.7334982.514197e-08
0.464111.7331332.436431e-08
0.466491.7327722.358265e-08
0.4688831.7324152.279699e-08
0.4712871.7320622.200729e-08
0.4737041.7317132.121355e-08
0.4761341.7313682.041573e-08
0.4785751.7310271.961383e-08
0.481.730831.914600e-08
0.481031.730691.877573e-08
0.4834971.7303561.788873e-08
0.4859761.7300261.699718e-08
0.4884691.72971.610106e-08
0.4909741.7293771.520035e-08
0.4934921.7290581.429501e-08
0.4960231.7287431.338503e-08
0.4985671.7284311.247039e-08
0.51.7282571.195500e-08
0.5011231.7281221.188326e-08
0.5036931.7278171.171916e-08
0.5062771.7275151.155421e-08
0.5088731.7272171.138841e-08
0.5114831.7269211.122177e-08
0.5141061.7266291.105427e-08
0.5167431.726341.088591e-08
0.5193931.7260541.071669e-08
0.5220561.7257711.054660e-08
0.5247341.7254911.037564e-08
0.5274251.7252151.020381e-08
0.530131.7249411.003109e-08
0.5328491.724679.857482e-09
0.5355811.7244029.682986e-09
0.5383281.7241369.507596e-09
0.5410891.7238749.331306e-09
0.5438641.7236149.154113e-09
0.5466531.7233578.976010e-09
0.5494571.7231038.796994e-09
0.551.7230548.762300e-09
0.5522751.7228518.798538e-09
0.5551071.7226028.843663e-09
0.5579541.7223558.889020e-09
0.5608151.7221118.934609e-09
0.5636911.721878.980431e-09
0.5665821.7216319.026489e-09
0.5694881.7213949.072783e-09
0.5724091.721169.119315e-09
0.5753441.7209289.166085e-09
0.5782951.7206999.213095e-09
0.5812611.7204719.260346e-09
0.5842421.7202479.307839e-09
0.5872381.7200249.355576e-09
0.590251.7198039.403558e-09
0.5932771.7195859.451786e-09
0.5963191.7193699.500261e-09
0.5993781.7191559.548985e-09
0.61.7191129.558900e-09
0.6024521.7189439.597934e-09
0.6055411.7187349.647128e-09
0.6086471.7185269.696574e-09
0.6117681.718329.746274e-09
0.6149061.7181169.796228e-09
0.6180591.7179159.846439e-09
0.6212291.7177159.896908e-09
0.6244151.7175179.947635e-09
0.6276171.7173219.998622e-09
0.6308361.7171271.004987e-08
0.6340711.7169341.010138e-08
0.6373231.7167441.015316e-08
0.6405921.7165551.020520e-08
0.6438771.7163681.025751e-08
0.6471791.7161831.031008e-08
0.651.7160271.035500e-08
0.6504981.7159991.036294e-08
0.6538341.7158171.041612e-08
0.6571871.7156371.046957e-08
0.6605581.7154591.052329e-08
0.6639451.7152821.057729e-08
0.6673511.7151061.063157e-08
0.6707731.7149321.068612e-08
0.6742131.714761.074096e-08
0.6776711.714591.079607e-08
0.6811461.714421.085147e-08
0.684641.7142531.090715e-08
0.6881511.7140861.096312e-08
0.691681.7139221.101938e-08
0.6952271.7137581.107592e-08
0.6987931.7135961.113276e-08
0.71.7135421.115200e-08
0.7023761.7134361.118986e-08
0.7059791.7132761.124724e-08
0.7095991.7131191.130492e-08
0.7132381.7129621.136289e-08
0.7168961.7128071.142116e-08
0.7205731.7126531.147973e-08
0.7242681.71251.153860e-08
0.7279831.7123491.159777e-08
0.7317161.7121991.165724e-08
0.7354691.712051.171702e-08
0.7392411.7119021.177711e-08
0.7430321.7117551.183750e-08
0.7468431.711611.189820e-08
0.7506731.7114651.195922e-08
0.7545231.7113221.202055e-08
0.7583921.711181.208219e-08
0.7622821.7110391.214415e-08
0.7661911.7108991.220642e-08
0.770121.710761.226902e-08
0.774071.7106221.233194e-08
0.778041.7104851.239517e-08
0.782031.710351.245874e-08
0.7860411.7102151.252263e-08
0.7900721.7100811.258685e-08
0.7941241.7099481.265139e-08
0.7981961.7098161.271627e-08
0.81.7097581.274500e-08
0.802291.7096851.278150e-08
0.8064051.7095551.284709e-08
0.810541.7094261.291301e-08
0.8146971.7092971.297927e-08
0.8188751.709171.304587e-08
0.8230751.7090431.311281e-08
0.8272961.7089171.318010e-08
0.8315391.7087921.324773e-08
0.8358031.7086681.331571e-08
0.840091.7085451.338403e-08
0.8443981.7084221.345271e-08
0.8487291.70831.352174e-08
0.851.7082651.354200e-08
0.8530821.7081791.359106e-08
0.8574571.7080591.366071e-08
0.8618541.7079391.373072e-08
0.8662741.707821.380108e-08
0.8707171.7077021.387181e-08
0.8751821.7075841.394290e-08
0.8796711.7074671.401436e-08
0.8841821.7073511.408618e-08
0.8887171.7072351.415837e-08
0.8932741.707121.423093e-08
0.8978561.7070061.430386e-08
0.91.7069531.433800e-08
0.902461.7068921.437722e-08
0.9070881.7067791.445099e-08
0.9117411.7066661.452514e-08
0.9164161.7065541.459968e-08
0.9211161.7064421.467459e-08
0.925841.7063311.474989e-08
0.9305881.7062211.482558e-08
0.9353611.7061111.490165e-08
0.9401581.7060011.497812e-08
0.944981.7058921.505497e-08
0.9498261.7057831.513222e-08
0.951.705781.513500e-08
0.9546971.7056751.520978e-08
0.9595931.7055681.528772e-08
0.9645151.705461.536607e-08
0.9694611.7053541.544482e-08
0.9744331.7052471.552397e-08
0.979431.7051411.560353e-08
0.9844531.7050351.568350e-08
0.9895021.704931.576387e-08
0.9945771.7048251.584466e-08
0.9996781.7047211.592587e-08
11.7047141.593100e-08
1.00481.7046161.600755e-08
1.009961.7045121.608966e-08
1.015141.7044091.617219e-08
1.020341.7043051.625514e-08
1.025581.7042021.633851e-08
1.030841.70411.642232e-08
1.036121.7039971.650655e-08
1.041441.7038951.659122e-08
1.046781.7037931.667632e-08
1.052151.7036911.676185e-08
1.057541.703591.684783e-08
1.061.7035441.688700e-08
1.062971.7034881.693425e-08
1.068421.7033871.702113e-08
1.07391.7032861.710844e-08
1.07941.7031851.719621e-08
1.084941.7030851.728443e-08
1.09051.7029841.737309e-08
1.09611.7028841.746222e-08
1.101721.7027831.755180e-08
1.107371.7026831.764184e-08
1.113051.7025831.773234e-08
1.118761.7024831.782330e-08
1.124491.7023841.791474e-08
1.130261.7022841.800664e-08
1.136061.7021841.809901e-08
1.141881.7020841.819185e-08
1.147741.7019851.828518e-08
1.153621.7018851.837898e-08
1.159541.7017851.847326e-08
1.165491.7016861.856802e-08
1.171471.7015861.866328e-08
1.177471.7014871.875902e-08
1.183511.7013871.885525e-08
1.189581.7012871.895197e-08
1.195681.7011871.904919e-08
1.21.7011171.911800e-08
1.201811.7010881.914690e-08
1.207981.7009881.924509e-08
1.214171.7008881.934377e-08
1.22041.7007881.944297e-08
1.226661.7006871.954267e-08
1.232951.7005871.964289e-08
1.239271.7004861.974361e-08
1.245631.7003861.984486e-08
1.252021.7002851.994662e-08
1.258441.7001842.004891e-08
1.264891.7000832.015172e-08
1.271381.6999822.025506e-08
1.27791.699882.035893e-08
1.284451.6997782.046333e-08
1.291041.6996762.056826e-08
1.297661.6995742.067374e-08
1.304321.6994722.077975e-08
1.311011.6993692.088631e-08
1.317731.6992662.099342e-08
1.324491.6991632.110107e-08
1.331281.6990592.120928e-08
1.338111.6989552.131804e-08
1.344971.6988512.142736e-08
1.351871.6987462.153724e-08
1.35881.6986412.164769e-08
1.365771.6985362.175870e-08
1.372771.698432.187028e-08
1.379811.6983242.198243e-08
1.386891.6982182.209515e-08
1.3941.6981112.220846e-08
1.41.6980212.230400e-08
1.401151.6980042.239585e-08
1.408341.6978962.296896e-08
1.415561.6977882.354500e-08
1.422821.6976792.412400e-08
1.430121.697572.470597e-08
1.437451.6974612.529092e-08
1.444821.6973512.587888e-08
1.452231.697242.646984e-08
1.459681.6971292.706384e-08
1.467171.6970172.766089e-08
1.474691.6969052.826100e-08
1.482251.6967932.886418e-08
1.489861.6966792.947046e-08
1.49751.6965653.007985e-08
1.505181.6964513.069236e-08
1.51291.6963363.130802e-08
1.520651.696223.192683e-08
1.528451.6961033.254881e-08
1.536291.6959863.317399e-08
1.544171.6958693.380237e-08
1.552091.695753.443397e-08
1.560051.6956313.506882e-08
1.568051.6955113.570692e-08
1.576091.6953913.634829e-08
1.584181.6952693.699295e-08
1.59231.6951473.764092e-08
1.61.6950323.825500e-08
1.600471.6950253.850157e-08
1.608671.6949014.283971e-08
1.616921.6947764.720010e-08
1.625221.6946515.158285e-08
1.633551.6945255.598808e-08
1.641931.6943986.041591e-08
1.650351.694276.486644e-08
1.658811.6941426.933979e-08
1.667321.6940127.383609e-08
1.675871.6938827.835544e-08
1.684471.693758.289798e-08
1.693111.6936188.746381e-08
1.701791.6934849.205305e-08
1.710521.693359.666583e-08
1.719291.6932151.013023e-07
1.728111.6930781.059625e-07
1.736971.6929411.106466e-07
1.745881.6928031.153547e-07
1.754831.6926631.200870e-07
1.763831.6925231.248436e-07
1.772881.6923811.296245e-07
1.781971.6922381.344300e-07
1.791111.6920941.392601e-07
1.81.6919541.439600e-07
1.800291.6919491.444117e-07
1.809531.6918031.586316e-07
1.818811.6916561.729245e-07
1.828131.6915071.872907e-07
1.837511.6913572.017305e-07
1.846931.6912062.162444e-07
1.856411.6910542.308328e-07
1.865931.69092.454959e-07
1.87551.6907452.602343e-07
1.885111.6905892.750482e-07
1.894781.6904312.899381e-07
1.90451.6902723.049044e-07
1.914271.6901123.199474e-07
1.924081.689953.350676e-07
1.933951.6897863.502654e-07
1.943871.6896223.655410e-07
1.953841.6894563.808950e-07
1.963861.6892883.963278e-07
1.973931.6891194.118397e-07
1.984051.6889484.274312e-07
1.994231.6887764.431026e-07
21.6886774.519900e-07
2.004461.6886024.710704e-07
2.014741.6884265.150791e-07
2.025071.6882495.593135e-07
2.035461.688076.037748e-07
2.045891.687896.484641e-07
2.056391.6877076.933825e-07
2.066931.6875237.385314e-07
2.077531.6873387.839118e-07
2.088191.687158.295249e-07
2.09891.6869618.753720e-07
2.109661.686779.214541e-07
2.120481.6865779.677727e-07
2.131361.6863821.014329e-06
2.142291.6861851.061124e-06
2.153271.6859861.108158e-06
2.164321.6857851.155434e-06
2.175421.6855821.202953e-06
2.186571.6853781.250715e-06
2.197791.6851711.298722e-06
2.21.685131.308200e-06
2.209061.6849621.496627e-06
2.220391.6847511.732314e-06
2.231771.6845371.969209e-06
2.243221.6843222.207320e-06
2.254721.6841042.446651e-06
2.266291.6838842.687210e-06
2.277911.6836622.929003e-06
2.289591.6834383.172036e-06
2.301331.6832113.416315e-06
2.313141.6829823.661846e-06
2.3251.682753.908638e-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
—