Optical constants

Refractive index of H-BAK8 (CDGM)

H-BAK8: 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
1.5725
Extinction coefficient k
1.40486e-08
Permittivity ε1
2.47275
Permittivity ε2
4.41829e-08
Absorption coefficient α
0.00300443 cm⁻¹
Penetration depth δ = λ/(2πk)
6.65683e+09 nm
Abbe number Vd
57.487
Chromatic dispersion dn/dλ
-0.0513503 µm⁻¹
Group index ng
1.60267
Group velocity dispersion
91.0936 fs²/mm
Dispersion parameter D
-496.964 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-BAK8 (CDGM): H-BAK8
cdgm_h_bak8 = ls.fetch_refractiveindex("specs", "CDGM-optical", "H-BAK8", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_h_bak8.range_nm)  # (302, 2325) nm
eps = cdgm_h_bak8.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=0.845101506λ2λ2−100.298196+1.01452466λ2λ2−0.00555241848+0.418518474λ2λ2−0.0202280796

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C20.845101506
C3100.298196
C41.01452466
C50.00555241848
C60.418518474
C70.0202280796

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 6.29e-08 1.64e-08 -1.82e-11 4.71e-07 4.87e-10 0.223
nd
1.572500
Vd
57.486797
glass code
573575
density
value: 3180
thermal expansion
value: 7.4e-06, temperature range: 243 343; value: 8.9e-06, temperature range: 293 573
dPgF
-0.001
resistance
climatic: 2.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 6.56e-07 K⁻¹ at 633 nm, dn/dT = 1.58e-07 K⁻¹ at 1310 nm, dn/dT = 1.20e-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
H-BAK8 (CDGM), H-BAK8: n and k versus wavelength
λ (µm)nk
0.3021.6178131.793360e-06
0.3035491.6171091.647508e-06
0.3051061.6164161.500909e-06
0.306671.6157321.353557e-06
0.3082431.6150571.205450e-06
0.3098241.6143921.056584e-06
0.311.6143181.040000e-06
0.3114131.6137369.684329e-07
0.313011.6130898.875325e-07
0.3146151.612458.062173e-07
0.3162291.6118217.244850e-07
0.317851.61126.423335e-07
0.3194811.6105875.597607e-07
0.321.6103945.334500e-07
0.3211191.6099835.043905e-07
0.3227661.6093864.616247e-07
0.3244211.6087984.186396e-07
0.3260851.6082173.754341e-07
0.3277571.6076453.320070e-07
0.3294381.6070792.883571e-07
0.331.6068932.737700e-07
0.3311281.6065212.588673e-07
0.3328261.6059712.364274e-07
0.3345331.6054282.138724e-07
0.3362491.6048921.912017e-07
0.3379731.6043621.684147e-07
0.3397061.603841.455109e-07
0.341.6037521.416300e-07
0.3414481.6033241.317432e-07
0.34321.6028151.197907e-07
0.344961.6023131.077769e-07
0.3467291.6018179.570155e-08
0.3485071.6013278.356424e-08
0.351.6009237.337400e-08
0.3502941.6008447.231753e-08
0.3520911.6003676.587029e-08
0.3538971.5998965.938998e-08
0.3557121.599435.287643e-08
0.3575361.5989714.632949e-08
0.3593691.5985173.974896e-08
0.361.5983633.748600e-08
0.3612121.5980693.580843e-08
0.3630651.5976273.324533e-08
0.3649271.597193.066909e-08
0.3667981.5967582.807964e-08
0.368681.5963322.547690e-08
0.371.5960382.365000e-08
0.370571.5959112.316563e-08
0.3724711.5954962.155175e-08
0.3743811.5950851.992959e-08
0.3763011.5946791.829911e-08
0.3782311.5942791.666027e-08
0.381.5939181.515800e-08
0.3801711.5938831.527141e-08
0.382121.5934921.656661e-08
0.384081.5931061.786844e-08
0.386051.5927241.917696e-08
0.388031.5923472.049218e-08
0.391.5919782.180100e-08
0.390021.5919752.178943e-08
0.392021.5916072.062010e-08
0.394031.5912431.944477e-08
0.3960511.5908841.826342e-08
0.3980821.5905291.707601e-08
0.41.5901991.595500e-08
0.4001241.5901781.595995e-08
0.4021761.5898321.604182e-08
0.4042391.5894891.612412e-08
0.4063121.5891511.620684e-08
0.4083961.5888161.628998e-08
0.410491.5884851.637355e-08
0.4125951.5881591.645755e-08
0.4147111.5878361.654198e-08
0.4168381.5875171.662684e-08
0.4189761.5872011.671214e-08
0.421.5870521.675300e-08
0.4211251.5868891.679787e-08
0.4232841.5865811.688404e-08
0.4254551.5862771.697066e-08
0.4276371.5859751.705772e-08
0.429831.5856781.714523e-08
0.4320351.5853831.723318e-08
0.434251.5850921.732159e-08
0.4364771.5848051.741045e-08
0.4387161.584521.749976e-08
0.441.5843591.755100e-08
0.4409661.5842391.758954e-08
0.4432271.5839611.767977e-08
0.44551.5836861.777047e-08
0.4477851.5834151.786163e-08
0.4500821.5831461.795326e-08
0.452391.582881.804536e-08
0.454711.5826181.813793e-08
0.4570421.5823581.823097e-08
0.4593861.5821011.832450e-08
0.461.5820341.834900e-08
0.4617421.5818471.841841e-08
0.464111.5815961.851278e-08
0.466491.5813471.860763e-08
0.4688831.5811011.870297e-08
0.4712871.5808581.879879e-08
0.4737041.5806181.889511e-08
0.4761341.580381.899192e-08
0.4785751.5801451.908923e-08
0.481.580011.914600e-08
0.481031.5799131.918709e-08
0.4834971.5796821.928552e-08
0.4859761.5794551.938446e-08
0.4884691.579231.948390e-08
0.4909741.5790071.958386e-08
0.4934921.5787871.968432e-08
0.4960231.5785691.978531e-08
0.4985671.5783531.988681e-08
0.51.5782331.994400e-08
0.5011231.578141.979134e-08
0.5036931.5779291.944213e-08
0.5062771.577721.909112e-08
0.5088731.5775131.873832e-08
0.5114831.5773091.838370e-08
0.5141061.5771071.802727e-08
0.5167431.5769061.766901e-08
0.5193931.5767081.730891e-08
0.5220561.5765121.694696e-08
0.5247341.5763181.658316e-08
0.5274251.5761271.621749e-08
0.530131.5759371.584995e-08
0.5328491.5757491.548052e-08
0.5355811.5755631.510920e-08
0.5383281.5753781.473597e-08
0.5410891.5751961.436083e-08
0.5438641.5750161.398377e-08
0.5466531.5748371.360477e-08
0.5494571.574661.322383e-08
0.551.5746261.315000e-08
0.5522751.5744851.320436e-08
0.5551071.5743121.327206e-08
0.5579541.5741411.334010e-08
0.5608151.5739711.340848e-08
0.5636911.5738031.347722e-08
0.5665821.5736361.354632e-08
0.5694881.5734721.361576e-08
0.5724091.5733091.368557e-08
0.5753441.5731471.375573e-08
0.5782951.5729871.382625e-08
0.5812611.5728291.389713e-08
0.5842421.5726721.396838e-08
0.5872381.5725171.403999e-08
0.590251.5723631.411197e-08
0.5932771.5722111.418432e-08
0.5963191.572061.425703e-08
0.5993781.571911.433013e-08
0.61.571881.434500e-08
0.6024521.5717621.440364e-08
0.6055411.5716161.447755e-08
0.6086471.5714711.455183e-08
0.6117681.5713271.462650e-08
0.6149061.5711841.470154e-08
0.6180591.5710431.477698e-08
0.6212291.5709041.485280e-08
0.6244151.5707651.492901e-08
0.6276171.5706281.500561e-08
0.6308361.5704921.508260e-08
0.6340711.5703571.515998e-08
0.6373231.5702241.523777e-08
0.6405921.5700911.531595e-08
0.6438771.569961.539454e-08
0.6471791.569831.547352e-08
0.651.5697211.554100e-08
0.6504981.5697021.555291e-08
0.6538341.5695741.563264e-08
0.6571871.5694481.571278e-08
0.6605581.5693221.579333e-08
0.6639451.5691981.587430e-08
0.6673511.5690751.595568e-08
0.6707731.5689531.603748e-08
0.6742131.5688321.611969e-08
0.6776711.5687121.620233e-08
0.6811461.5685931.628540e-08
0.684641.5684751.636889e-08
0.6881511.5683581.645280e-08
0.691681.5682421.653715e-08
0.6952271.5681271.662193e-08
0.6987931.5680121.670715e-08
0.71.5679741.673600e-08
0.7023761.5678991.664115e-08
0.7059791.5677871.649739e-08
0.7095991.5676761.635289e-08
0.7132381.5675651.620765e-08
0.7168961.5674561.606167e-08
0.7205731.5673471.591494e-08
0.7242681.5672391.576745e-08
0.7279831.5671321.561921e-08
0.7317161.5670261.547020e-08
0.7354691.5669211.532044e-08
0.7392411.5668171.516990e-08
0.7430321.5667131.501859e-08
0.7468431.566611.486651e-08
0.7506731.5665081.471365e-08
0.7545231.5664061.456000e-08
0.7583921.5663061.440557e-08
0.7622821.5662061.425034e-08
0.7661911.5661071.409432e-08
0.770121.5660081.393749e-08
0.774071.5659111.377987e-08
0.778041.5658131.362143e-08
0.782031.5657171.346218e-08
0.7860411.5656211.330212e-08
0.7900721.5655261.314123e-08
0.7941241.5654321.297952e-08
0.7981961.5653381.281698e-08
0.81.5652971.274500e-08
0.802291.5652451.278150e-08
0.8064051.5651521.284709e-08
0.810541.565061.291301e-08
0.8146971.5649691.297927e-08
0.8188751.5648781.304587e-08
0.8230751.5647881.311281e-08
0.8272961.5646981.318010e-08
0.8315391.5646091.324773e-08
0.8358031.564521.331571e-08
0.840091.5644321.338403e-08
0.8443981.5643451.345271e-08
0.8487291.5642581.352174e-08
0.851.5642321.354200e-08
0.8530821.5641711.359106e-08
0.8574571.5640851.366071e-08
0.8618541.5641.373072e-08
0.8662741.5639151.380108e-08
0.8707171.563831.387181e-08
0.8751821.5637461.394290e-08
0.8796711.5636621.401436e-08
0.8841821.5635791.408618e-08
0.8887171.5634961.415837e-08
0.8932741.5634131.423093e-08
0.8978561.5633311.430386e-08
0.91.5632931.433800e-08
0.902461.5632491.437722e-08
0.9070881.5631681.445099e-08
0.9117411.5630871.452514e-08
0.9164161.5630061.459968e-08
0.9211161.5629261.467459e-08
0.925841.5628461.474989e-08
0.9305881.5627671.482558e-08
0.9353611.5626871.490165e-08
0.9401581.5626081.497812e-08
0.944981.562531.505497e-08
0.9498261.5624511.513222e-08
0.951.5624491.513500e-08
0.9546971.5623731.520978e-08
0.9595931.5622961.528772e-08
0.9645151.5622181.536607e-08
0.9694611.5621411.544482e-08
0.9744331.5620641.552397e-08
0.979431.5619871.560353e-08
0.9844531.5619111.568350e-08
0.9895021.5618341.576387e-08
0.9945771.5617581.584466e-08
0.9996781.5616831.592587e-08
11.5616781.593100e-08
1.00481.5616071.600755e-08
1.009961.5615321.608966e-08
1.015141.5614561.617219e-08
1.020341.5613811.625514e-08
1.025581.5613061.633851e-08
1.030841.5612321.642232e-08
1.036121.5611571.650655e-08
1.041441.5610831.659122e-08
1.046781.5610081.667632e-08
1.052151.5609341.676185e-08
1.057541.560861.684783e-08
1.061.5608271.688700e-08
1.062971.5607861.693425e-08
1.068421.5607121.702113e-08
1.07391.5606391.710844e-08
1.07941.5605651.719621e-08
1.084941.5604911.728443e-08
1.09051.5604181.737309e-08
1.09611.5603441.746222e-08
1.101721.5602711.755180e-08
1.107371.5601981.764184e-08
1.113051.5601241.773234e-08
1.118761.5600511.782330e-08
1.124491.5599781.791474e-08
1.130261.5599051.800664e-08
1.136061.5598311.809901e-08
1.141881.5597581.819185e-08
1.147741.5596851.828518e-08
1.153621.5596121.837898e-08
1.159541.5595381.847326e-08
1.165491.5594651.856802e-08
1.171471.5593921.866328e-08
1.177471.5593181.875902e-08
1.183511.5592451.885525e-08
1.189581.5591711.895197e-08
1.195681.5590971.904919e-08
1.21.5590461.911800e-08
1.201811.5590242.016463e-08
1.207981.558952.372042e-08
1.214171.5588762.729446e-08
1.22041.5588023.088682e-08
1.226661.5587283.449761e-08
1.232951.5586533.812691e-08
1.239271.5585794.177483e-08
1.245631.5585044.544146e-08
1.252021.558434.912689e-08
1.258441.5583555.283122e-08
1.264891.558285.655455e-08
1.271381.5582046.029697e-08
1.27791.5581296.405859e-08
1.284451.5580536.783950e-08
1.291041.5579787.163980e-08
1.297661.5579027.545958e-08
1.304321.5578257.929896e-08
1.311011.5577498.315803e-08
1.317731.5576728.703689e-08
1.324491.5575959.093565e-08
1.331281.5575189.485439e-08
1.338111.557449.879324e-08
1.344971.5573621.027523e-07
1.351871.5572841.067316e-07
1.35881.5572061.107314e-07
1.365771.5571271.147517e-07
1.372771.5570481.187926e-07
1.379811.5569691.228542e-07
1.386891.5568891.269366e-07
1.3941.5568091.310400e-07
1.41.5567421.345000e-07
1.401151.5567291.343144e-07
1.408341.5566481.331564e-07
1.415561.5565671.319925e-07
1.422821.5564861.308226e-07
1.430121.5564041.296467e-07
1.437451.5563221.284647e-07
1.444821.5562391.272767e-07
1.452231.5561561.260826e-07
1.459681.5560731.248824e-07
1.467171.5559891.236761e-07
1.474691.5559051.224635e-07
1.482251.555821.212447e-07
1.489861.5557351.200197e-07
1.49751.5556491.187884e-07
1.505181.5555631.175508e-07
1.51291.5554761.163068e-07
1.520651.5553891.150565e-07
1.528451.5553011.137997e-07
1.536291.5552131.125365e-07
1.544171.5551241.112668e-07
1.552091.5550351.099906e-07
1.560051.5549451.087079e-07
1.568051.5548551.074186e-07
1.576091.5547641.061226e-07
1.584181.5546721.048201e-07
1.59231.554581.035108e-07
1.61.5544921.022700e-07
1.600471.5544871.028431e-07
1.608671.5543941.129267e-07
1.616921.55431.230619e-07
1.625221.5542051.332492e-07
1.633551.5541091.434887e-07
1.641931.5540131.537807e-07
1.650351.5539171.641254e-07
1.658811.5538191.745233e-07
1.667321.5537211.849744e-07
1.675871.5536221.954792e-07
1.684471.5535232.060378e-07
1.693111.5534232.166506e-07
1.701791.5533222.273178e-07
1.710521.553222.380398e-07
1.719291.5531172.488167e-07
1.728111.5530142.596488e-07
1.736971.552912.705366e-07
1.745881.5528052.814801e-07
1.754831.5526992.924798e-07
1.763831.5525923.035359e-07
1.772881.5524853.146487e-07
1.781971.5523773.258185e-07
1.791111.5522673.370456e-07
1.81.5521613.479700e-07
1.800291.5521573.485099e-07
1.809531.5520463.655071e-07
1.818811.5519343.825914e-07
1.828131.5518213.997634e-07
1.837511.5517074.170234e-07
1.846931.5515934.343720e-07
1.856411.5514774.518095e-07
1.865931.551364.693365e-07
1.87551.5512424.869533e-07
1.885111.5511245.046605e-07
1.894781.5510045.224585e-07
1.90451.5508835.403478e-07
1.914271.5507615.583288e-07
1.924081.5506385.764020e-07
1.933951.5505145.945680e-07
1.943871.5503886.128271e-07
1.953841.5502626.311798e-07
1.963861.5501346.496267e-07
1.973931.5500066.681681e-07
1.984051.5498766.868047e-07
1.994231.5497457.055368e-07
21.549677.161600e-07
2.004461.5496127.443510e-07
2.014741.5494798.093734e-07
2.025071.5493448.747292e-07
2.035461.5492089.404202e-07
2.045891.549071.006448e-06
2.056391.5489321.072815e-06
2.066931.5487921.139521e-06
2.077531.548651.206570e-06
2.088191.5485081.273963e-06
2.09891.5483641.341702e-06
2.109661.5482181.409788e-06
2.120481.5480711.478223e-06
2.131361.5479231.547009e-06
2.142291.5477731.616148e-06
2.153271.5476221.685641e-06
2.164321.5474691.755491e-06
2.175421.5473141.825699e-06
2.186571.5471591.896267e-06
2.197791.5470011.967197e-06
2.21.546971.981200e-06
2.209061.5468422.037148e-06
2.220391.5466812.107128e-06
2.231771.5465192.177468e-06
2.243221.5463552.248168e-06
2.254721.5461892.319230e-06
2.266291.5460222.390657e-06
2.277911.5458532.462451e-06
2.289591.5456822.534612e-06
2.301331.545512.607144e-06
2.313141.5453352.680048e-06
2.3251.5451592.753325e-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
—