Optical constants

Refractive index of D-LAK6 (CDGM)

D-LAK6: 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.

At one wavelength

Range 0.302–2.325 µm
Refractive index n
1.69384
Extinction coefficient k
1.87414e-08
Permittivity ε1
2.86909
Permittivity ε2
6.34899e-08
Absorption coefficient α
0.00400803 cm⁻¹
Penetration depth δ = λ/(2πk)
4.98998e+09 nm
Abbe number Vd
53.128
Chromatic dispersion dn/dλ
-0.0673494 µm⁻¹
Group index ng
1.73341
Group velocity dispersion
118.906 fs²/mm
Dispersion parameter D
-648.695 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

# D-LAK6 (CDGM): D-LAK6
cdgm_d_lak6 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-LAK6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_lak6.range_nm)  # (302, 2325) nm
eps = cdgm_d_lak6.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=0.477723115λ2λ2−0.0226962287+1.33623366λ2λ2−0.00659605302+1.22543438λ2λ2−94.2027569

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C20.477723115
C30.0226962287
C41.33623366
C50.00659605302
C61.22543438
C794.2027569

Comments and conditions

anneal rate:4°C/h

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.33e-06 1.27e-08 -2.36e-11 5.62e-07 7.08e-10 0.199
nd
1.693840
Vd
53.128245
glass code
694531
density
value: 3500
thermal expansion
value: 7.5e-06, temperature range: 243 343; value: 9.5e-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 = 1.59e-06 K⁻¹ at 633 nm, dn/dT = 8.97e-07 K⁻¹ at 1310 nm, dn/dT = 8.40e-07 K⁻¹ at 1550 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
D-LAK6 (CDGM), D-LAK6: n and k versus wavelength
λ (µm)nk
0.3021.7536279.699360e-06
0.3035491.7526898.696783e-06
0.3051061.7517637.689065e-06
0.306671.7508516.676178e-06
0.3082431.7499525.658097e-06
0.3098241.7490664.634795e-06
0.311.7489684.520800e-06
0.3114131.7481924.185732e-06
0.313011.7473313.806967e-06
0.3146151.7464823.426260e-06
0.3162291.7456443.043600e-06
0.317851.7448192.658978e-06
0.3194811.7440042.272383e-06
0.321.7437482.149200e-06
0.3211191.7432012.039846e-06
0.3227661.7424091.878915e-06
0.3244211.7416281.717158e-06
0.3260851.7408581.554571e-06
0.3277571.7400981.391151e-06
0.3294381.7393481.226893e-06
0.331.73911.172000e-06
0.3311281.7386081.115639e-06
0.3328261.7378781.030771e-06
0.3345331.7371599.454688e-07
0.3362491.7364488.597288e-07
0.3379731.7357477.735491e-07
0.3397061.7350566.869275e-07
0.341.734946.722500e-07
0.3414481.7343736.310578e-07
0.34321.73375.812593e-07
0.344961.7330355.312055e-07
0.3467291.7323794.808949e-07
0.3485071.7317324.303263e-07
0.351.7311973.878700e-07
0.3502941.7310933.836674e-07
0.3520911.7304623.580207e-07
0.3538971.7298393.322425e-07
0.3557121.7292253.063321e-07
0.3575361.7286182.802888e-07
0.3593691.7280192.541119e-07
0.361.7278162.451100e-07
0.3612121.7274282.340790e-07
0.3630651.7268442.172251e-07
0.3649271.7262672.002847e-07
0.3667981.7256981.832575e-07
0.368681.7251361.661430e-07
0.371.7247481.541300e-07
0.370571.7245811.513049e-07
0.3724711.7240331.418918e-07
0.3743811.7234921.324305e-07
0.3763011.7229571.229207e-07
0.3782311.7224291.133620e-07
0.381.7219541.046000e-07
0.3801711.7219081.042100e-07
0.382121.7213939.975671e-08
0.384081.7208859.528053e-08
0.386051.7203829.078140e-08
0.388031.7198868.625919e-08
0.391.71948.175900e-08
0.390021.7193968.174378e-08
0.392021.7189118.020500e-08
0.394031.7184337.865834e-08
0.3960511.717967.710375e-08
0.3980821.7174937.554118e-08
0.41.717067.406600e-08
0.4001241.7170327.402543e-08
0.4021761.7165767.335410e-08
0.4042391.7161267.267934e-08
0.4063121.7156817.200111e-08
0.4083961.7152417.131940e-08
0.410491.7148077.063420e-08
0.4125951.7143776.994548e-08
0.4147111.7139536.925323e-08
0.4168381.7135346.855743e-08
0.4189761.7131196.785806e-08
0.421.7129236.752300e-08
0.4211251.712716.710203e-08
0.4232841.7123056.629353e-08
0.4254551.7119056.548088e-08
0.4276371.7115096.466407e-08
0.429831.7111186.384306e-08
0.4320351.7107326.301785e-08
0.434251.710356.218840e-08
0.4364771.7099736.135470e-08
0.4387161.7095996.051673e-08
0.441.7093886.003600e-08
0.4409661.709235.944991e-08
0.4432271.7088665.807752e-08
0.44551.7085055.669809e-08
0.4477851.7081485.531158e-08
0.4500821.7077965.391797e-08
0.452391.7074475.251721e-08
0.454711.7071035.110926e-08
0.4570421.7067624.969410e-08
0.4593861.7064254.827167e-08
0.461.7063384.789900e-08
0.4617421.7060924.707075e-08
0.464111.7057634.594474e-08
0.466491.7054374.481296e-08
0.4688831.7051144.367537e-08
0.4712871.7047964.253195e-08
0.4737041.7044814.138266e-08
0.4761341.7041694.022748e-08
0.4785751.7038613.906638e-08
0.481.7036833.838900e-08
0.481031.7035563.764526e-08
0.4834971.7032543.586362e-08
0.4859761.7029563.407284e-08
0.4884691.7026613.227287e-08
0.4909741.7023693.046367e-08
0.4934921.702082.864520e-08
0.4960231.7017942.681740e-08
0.4985671.7015122.498022e-08
0.51.7013552.394500e-08
0.5011231.7012322.380113e-08
0.5036931.7009562.347201e-08
0.5062771.7006822.314121e-08
0.5088731.7004112.280870e-08
0.5114831.7001432.247450e-08
0.5141061.6998782.213858e-08
0.5167431.6996162.180094e-08
0.5193931.6993562.146156e-08
0.5220561.69912.112045e-08
0.5247341.6988452.077758e-08
0.5274251.6985942.043296e-08
0.530131.6983452.008657e-08
0.5328491.6980981.973840e-08
0.5355811.6978551.938845e-08
0.5383281.6976131.903670e-08
0.5410891.6973741.868315e-08
0.5438641.6971381.832779e-08
0.5466531.6969041.797060e-08
0.5494571.6966721.761158e-08
0.551.6966281.754200e-08
0.5522751.6964431.761456e-08
0.5551071.6962161.770491e-08
0.5579541.6959911.779573e-08
0.5608151.6957691.788701e-08
0.5636911.6955481.797876e-08
0.5665821.695331.807098e-08
0.5694881.6951141.816367e-08
0.5724091.69491.825684e-08
0.5753441.6946881.835048e-08
0.5782951.6944791.844461e-08
0.5812611.6942711.853922e-08
0.5842421.6940651.863431e-08
0.5872381.6938621.872989e-08
0.590251.693661.882596e-08
0.5932771.693461.892253e-08
0.5963191.6932621.901959e-08
0.5993781.6930671.911715e-08
0.61.6930271.913700e-08
0.6024521.6928721.921520e-08
0.6055411.692681.931377e-08
0.6086471.692491.941283e-08
0.6117681.6923011.951241e-08
0.6149061.6921141.961249e-08
0.6180591.6919291.971309e-08
0.6212291.6917451.981420e-08
0.6244151.6915631.991584e-08
0.6276171.6913832.001799e-08
0.6308361.6912052.012067e-08
0.6340711.6910282.022387e-08
0.6373231.6908522.032761e-08
0.6405921.6906782.043187e-08
0.6438771.6905062.053667e-08
0.6471791.6903362.064201e-08
0.651.6901922.073200e-08
0.6504981.6901662.074788e-08
0.6538341.6899992.085423e-08
0.6571871.6898322.096113e-08
0.6605581.6896682.106858e-08
0.6639451.6895042.117658e-08
0.6673511.6893422.128514e-08
0.6707731.6891822.139425e-08
0.6742131.6890222.150391e-08
0.6776711.6888642.161415e-08
0.6811461.6887082.172494e-08
0.684641.6885522.183631e-08
0.6881511.6883982.194825e-08
0.691681.6882462.206076e-08
0.6952271.6880942.217384e-08
0.6987931.6879442.228751e-08
0.71.6878942.232600e-08
0.7023761.6877952.224998e-08
0.7059791.6876472.213474e-08
0.7095991.68752.201892e-08
0.7132381.6873552.190250e-08
0.7168961.687212.178549e-08
0.7205731.6870672.166787e-08
0.7242681.6869252.154965e-08
0.7279831.6867842.143083e-08
0.7317161.6866442.131140e-08
0.7354691.6865052.119135e-08
0.7392411.6863672.107069e-08
0.7430321.686232.094941e-08
0.7468431.6860942.082751e-08
0.7506731.6859592.070498e-08
0.7545231.6858252.058182e-08
0.7583921.6856922.045803e-08
0.7622821.685562.033361e-08
0.7661911.6854282.020855e-08
0.770121.6852982.008285e-08
0.774071.6851691.995650e-08
0.778041.685041.982951e-08
0.782031.6849131.970186e-08
0.7860411.6847861.957356e-08
0.7900721.684661.944460e-08
0.7941241.6845351.931498e-08
0.7981961.684411.918469e-08
0.81.6843561.912700e-08
0.802291.6842871.887120e-08
0.8064051.6841641.841161e-08
0.810541.6840421.794965e-08
0.8146971.683921.748533e-08
0.8188751.68381.701863e-08
0.8230751.683681.654953e-08
0.8272961.6835611.607803e-08
0.8315391.6834421.560411e-08
0.8358031.6833241.512776e-08
0.840091.6832071.464896e-08
0.8443981.6830911.416771e-08
0.8487291.6829751.368399e-08
0.851.6829411.354200e-08
0.8530821.682861.359106e-08
0.8574571.6827451.366071e-08
0.8618541.6826311.373072e-08
0.8662741.6825171.380108e-08
0.8707171.6824041.387181e-08
0.8751821.6822921.394290e-08
0.8796711.682181.401436e-08
0.8841821.6820691.408618e-08
0.8887171.6819581.415837e-08
0.8932741.6818481.423093e-08
0.8978561.6817381.430386e-08
0.91.6816871.433800e-08
0.902461.6816291.437722e-08
0.9070881.681521.445099e-08
0.9117411.6814111.452514e-08
0.9164161.6813031.459968e-08
0.9211161.6811961.467459e-08
0.925841.6810891.474989e-08
0.9305881.6809821.482558e-08
0.9353611.6808761.490165e-08
0.9401581.680771.497812e-08
0.944981.6806641.505497e-08
0.9498261.6805591.513222e-08
0.951.6805551.513500e-08
0.9546971.6804541.520978e-08
0.9595931.6803491.528772e-08
0.9645151.6802451.536607e-08
0.9694611.6801411.544482e-08
0.9744331.6800371.552397e-08
0.979431.6799341.560353e-08
0.9844531.6798311.568350e-08
0.9895021.6797281.576387e-08
0.9945771.6796251.584466e-08
0.9996781.6795231.592587e-08
11.6795161.593100e-08
1.00481.6794211.600755e-08
1.009961.6793191.608966e-08
1.015141.6792171.617219e-08
1.020341.6791151.625514e-08
1.025581.6790141.633851e-08
1.030841.6789131.642232e-08
1.036121.6788121.650655e-08
1.041441.6787111.659122e-08
1.046781.678611.667632e-08
1.052151.6785091.676185e-08
1.057541.6784091.684783e-08
1.061.6783631.688700e-08
1.062971.6783081.693425e-08
1.068421.6782081.702113e-08
1.07391.6781081.710844e-08
1.07941.6780081.719621e-08
1.084941.6779071.728443e-08
1.09051.6778071.737309e-08
1.09611.6777071.746222e-08
1.101721.6776071.755180e-08
1.107371.6775071.764184e-08
1.113051.6774071.773234e-08
1.118761.6773071.782330e-08
1.124491.6772071.791474e-08
1.130261.6771071.800664e-08
1.136061.6770061.809901e-08
1.141881.6769061.819185e-08
1.147741.6768061.828518e-08
1.153621.6767051.837898e-08
1.159541.6766051.847326e-08
1.165491.6765041.856802e-08
1.171471.6764031.866328e-08
1.177471.6763021.875902e-08
1.183511.6762011.885525e-08
1.189581.67611.895197e-08
1.195681.6759991.904919e-08
1.21.6759271.911800e-08
1.201811.6758971.914690e-08
1.207981.6757961.924509e-08
1.214171.6756941.934377e-08
1.22041.6755921.944297e-08
1.226661.6754891.954267e-08
1.232951.6753871.964289e-08
1.239271.6752841.974361e-08
1.245631.6751811.984486e-08
1.252021.6750781.994662e-08
1.258441.6749742.004891e-08
1.264891.674872.015172e-08
1.271381.6747662.025506e-08
1.27791.6746612.035893e-08
1.284451.6745572.046333e-08
1.291041.6744512.056826e-08
1.297661.6743462.067374e-08
1.304321.674242.077975e-08
1.311011.6741342.088631e-08
1.317731.6740272.099342e-08
1.324491.673922.110107e-08
1.331281.6738132.120928e-08
1.338111.6737052.131804e-08
1.344971.6735962.142736e-08
1.351871.6734882.153724e-08
1.35881.6733782.164769e-08
1.365771.6732692.175870e-08
1.372771.6731582.187028e-08
1.379811.6730482.198243e-08
1.386891.6729362.209515e-08
1.3941.6728252.220846e-08
1.41.672732.230400e-08
1.401151.6727122.232235e-08
1.408341.67262.243682e-08
1.415561.6724862.255187e-08
1.422821.6723722.266752e-08
1.430121.6722582.278376e-08
1.437451.6721422.290060e-08
1.444821.6720272.301803e-08
1.452231.671912.313607e-08
1.459681.6717932.325472e-08
1.467171.6716752.337397e-08
1.474691.6715572.349383e-08
1.482251.6714382.361431e-08
1.489861.6713182.373541e-08
1.49751.6711972.385712e-08
1.505181.6710762.397946e-08
1.51291.6709542.410243e-08
1.520651.6708312.422603e-08
1.528451.6707082.435027e-08
1.536291.6705832.447514e-08
1.544171.6704582.460065e-08
1.552091.6703322.472680e-08
1.560051.6702052.485360e-08
1.568051.6700782.498105e-08
1.576091.6699492.510916e-08
1.584181.669822.523792e-08
1.59231.6696892.536735e-08
1.61.6695662.549000e-08
1.600471.6695582.556446e-08
1.608671.6694262.687450e-08
1.616921.6692932.819126e-08
1.625221.6691592.951477e-08
1.633551.6690243.084507e-08
1.641931.6688883.218219e-08
1.650351.6687513.352617e-08
1.658811.6686133.487704e-08
1.667321.6684743.623485e-08
1.675871.6683343.759961e-08
1.684471.6681923.897137e-08
1.693111.668054.035017e-08
1.701791.6679064.173604e-08
1.710521.6677624.312902e-08
1.719291.6676164.452914e-08
1.728111.6674694.593644e-08
1.736971.6673214.735096e-08
1.745881.6671724.877273e-08
1.754831.6670215.020179e-08
1.763831.6668695.163819e-08
1.772881.6667165.308195e-08
1.781971.6665625.453311e-08
1.791111.6664065.599172e-08
1.81.6662545.741100e-08
1.800291.6662495.794161e-08
1.809531.6660917.464699e-08
1.818811.6659329.143804e-08
1.828131.665771.083152e-07
1.837511.6656081.252789e-07
1.846931.6654441.423296e-07
1.856411.6652791.594678e-07
1.865931.6651121.766939e-07
1.87551.6649441.940083e-07
1.885111.6647742.114115e-07
1.894781.6646032.289039e-07
1.90451.664432.464861e-07
1.914271.6642552.641584e-07
1.924081.6640792.819214e-07
1.933951.6639022.997754e-07
1.943871.6637223.177211e-07
1.953841.6635413.357587e-07
1.963861.6633593.538889e-07
1.973931.6631743.721120e-07
1.984051.6629883.904286e-07
1.994231.66284.088392e-07
21.6626934.192800e-07
2.004461.662614.416186e-07
2.014741.6624194.931424e-07
2.025071.6622255.449305e-07
2.035461.662035.969842e-07
2.045891.6618336.493048e-07
2.056391.6616347.018937e-07
2.066931.6614337.547524e-07
2.077531.661238.078821e-07
2.088191.6610258.612844e-07
2.09891.6608189.149604e-07
2.109661.6606099.689118e-07
2.120481.6603971.023140e-06
2.131361.6601841.077646e-06
2.142291.6599691.132432e-06
2.153271.6597511.187498e-06
2.164321.6595311.242847e-06
2.175421.6593091.298480e-06
2.186571.6590841.354399e-06
2.197791.6588581.410604e-06
2.21.6588131.421700e-06
2.209061.6586291.653544e-06
2.220391.6583971.943538e-06
2.231771.6581632.235018e-06
2.243221.6579272.527993e-06
2.254721.6576882.822471e-06
2.266291.6574473.118459e-06
2.277911.6572033.415965e-06
2.289591.6569573.714997e-06
2.301331.6567084.015562e-06
2.313141.6564564.317669e-06
2.3251.6562024.621325e-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
—