Optical constants

Refractive index of H-BAK6 (CDGM)

H-BAK6: 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
1.56388
Extinction coefficient k
2.81403e-08
Permittivity ε1
2.44572
Permittivity ε2
8.80160e-08
Absorption coefficient α
0.00601806 cm⁻¹
Penetration depth δ = λ/(2πk)
3.32333e+09 nm
Abbe number Vd
60.765
Chromatic dispersion dn/dλ
-0.047982 µm⁻¹
Group index ng
1.59207
Group velocity dispersion
83.2827 fs²/mm
Dispersion parameter D
-454.352 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-BAK6 (CDGM): H-BAK6
cdgm_h_bak6 = ls.fetch_refractiveindex("specs", "CDGM-optical", "H-BAK6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_h_bak6.range_nm)  # (302, 2325) nm
eps = cdgm_h_bak6.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=0.813984879λ2λ2−0.00392398403+0.595734077λ2λ2−0.0164900015+1.00704301λ2λ2−107.665801

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C20.813984879
C30.00392398403
C40.595734077
C50.0164900015
C61.00704301
C7107.665801

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.02e-06 1.71e-08 -1.32e-11 4.2e-07 2.66e-10 0.209
nd
1.563880
Vd
60.764747
glass code
564608
density
value: 3050
thermal expansion
value: 6e-06, temperature range: 243 343; value: 7.7e-06, temperature range: 293 573
dPgF
-0.0006

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 1.01e-06 K⁻¹ at 633 nm, dn/dT = 5.75e-07 K⁻¹ at 1310 nm, dn/dT = 5.39e-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-BAK6 (CDGM), H-BAK6: n and k versus wavelength
λ (µm)nk
0.3021.6052868.394460e-06
0.3035491.6046557.662770e-06
0.3051061.6040316.927328e-06
0.306671.6034166.188115e-06
0.3082431.602815.445110e-06
0.3098241.6022114.698294e-06
0.311.6021454.615100e-06
0.3114131.601624.241660e-06
0.313011.6010373.819518e-06
0.3146151.6004623.395211e-06
0.3162291.5998942.968729e-06
0.317851.5993342.540059e-06
0.3194811.5987812.109191e-06
0.321.5986071.971900e-06
0.3211191.5982351.849409e-06
0.3227661.5976961.669143e-06
0.3244211.5971641.487953e-06
0.3260851.5966391.305833e-06
0.3277571.5961211.122780e-06
0.3294381.595619.387876e-07
0.331.5954418.773000e-07
0.3311281.5951058.254474e-07
0.3328261.5946067.473696e-07
0.3345331.5941146.688913e-07
0.3362491.5936285.900105e-07
0.3379731.5931485.107252e-07
0.3397061.5926744.310333e-07
0.341.5925944.175300e-07
0.3414481.5922063.867626e-07
0.34321.5917443.495670e-07
0.344961.5912873.121806e-07
0.3467291.5908372.746025e-07
0.3485071.5903922.368316e-07
0.351.5900242.051200e-07
0.3502941.5899522.020861e-07
0.3520911.5895181.835715e-07
0.3538971.5890891.649619e-07
0.3557121.5886661.462569e-07
0.3575361.5882471.274559e-07
0.3593691.5878341.085586e-07
0.361.5876941.020600e-07
0.3612121.5874269.689779e-08
0.3630651.5870238.901066e-08
0.3649271.5866248.108307e-08
0.3667981.5862317.311483e-08
0.368681.5858426.510573e-08
0.371.5855735.948400e-08
0.370571.5854585.834809e-08
0.3724711.5850785.456329e-08
0.3743811.5847035.075908e-08
0.3763011.5843334.693536e-08
0.3782311.5839674.309203e-08
0.381.5836373.956900e-08
0.3801711.5836053.947952e-08
0.382121.5832483.845768e-08
0.384081.5828953.743059e-08
0.386051.5825453.639824e-08
0.388031.5822013.536060e-08
0.391.5818633.432800e-08
0.390021.581863.431702e-08
0.392021.5815233.320689e-08
0.394031.581193.209108e-08
0.3960511.5808613.096954e-08
0.3980821.5805362.984225e-08
0.41.5802332.877800e-08
0.4001241.5802142.874514e-08
0.4021761.5798962.820135e-08
0.4042391.5795822.765477e-08
0.4063121.5792722.710538e-08
0.4083961.5789652.655318e-08
0.410491.5786622.599815e-08
0.4125951.5783622.544027e-08
0.4147111.5780652.487953e-08
0.4168381.5777722.431591e-08
0.4189761.5774822.374941e-08
0.421.5773452.347800e-08
0.4211251.5771962.393777e-08
0.4232841.5769132.482078e-08
0.4254551.5766322.570832e-08
0.4276371.5763562.660041e-08
0.429831.5760822.749708e-08
0.4320351.5758112.839834e-08
0.434251.5755432.930423e-08
0.4364771.5752793.021476e-08
0.4387161.5750173.112997e-08
0.441.5748693.165500e-08
0.4409661.5747583.119021e-08
0.4432271.5745023.010187e-08
0.44551.5742492.900794e-08
0.4477851.5739982.790840e-08
0.4500821.5737512.680322e-08
0.452391.5735062.569238e-08
0.454711.5732632.457583e-08
0.4570421.5730242.345356e-08
0.4593861.5727872.232554e-08
0.461.5727252.203000e-08
0.4617421.5725522.244822e-08
0.464111.5723212.301679e-08
0.466491.5720912.358827e-08
0.4688831.5718642.416269e-08
0.4712871.571642.474005e-08
0.4737041.5714182.532037e-08
0.4761341.5711982.590367e-08
0.4785751.5709812.648996e-08
0.481.5708552.683200e-08
0.481031.5707662.688957e-08
0.4834971.5705532.702747e-08
0.4859761.5703422.716608e-08
0.4884691.5701342.730540e-08
0.4909741.5699282.744544e-08
0.4934921.5697242.758619e-08
0.4960231.5695222.772767e-08
0.4985671.5693232.786987e-08
0.51.5692112.795000e-08
0.5011231.5691252.791382e-08
0.5036931.5689292.783107e-08
0.5062771.5687362.774789e-08
0.5088731.5685442.766428e-08
0.5114831.5683552.758025e-08
0.5141061.5681672.749578e-08
0.5167431.5679822.741089e-08
0.5193931.5677982.732555e-08
0.5220561.5676162.723978e-08
0.5247341.5674362.715357e-08
0.5274251.5672582.706692e-08
0.530131.5670812.697982e-08
0.5328491.5669062.689227e-08
0.5355811.5667342.680428e-08
0.5383281.5665622.671583e-08
0.5410891.5663932.662694e-08
0.5438641.5662252.653758e-08
0.5466531.5660592.644777e-08
0.5494571.5658942.635750e-08
0.551.5658632.634000e-08
0.5522751.5657322.644891e-08
0.5551071.565572.658452e-08
0.5579541.5654112.672083e-08
0.5608151.5652522.685783e-08
0.5636911.5650962.699554e-08
0.5665821.5649412.713396e-08
0.5694881.5647872.727309e-08
0.5724091.5646352.741293e-08
0.5753441.5644842.755348e-08
0.5782951.5643352.769476e-08
0.5812611.5641872.783676e-08
0.5842421.5640412.797949e-08
0.5872381.5638962.812296e-08
0.590251.5637522.826715e-08
0.5932771.5636092.841209e-08
0.5963191.5634682.855777e-08
0.5993781.5633292.870420e-08
0.61.5633012.873400e-08
0.6024521.563192.859642e-08
0.6055411.5630532.842303e-08
0.6086471.5629172.824874e-08
0.6117681.5627822.807357e-08
0.6149061.5626492.789749e-08
0.6180591.5625172.772052e-08
0.6212291.5623862.754263e-08
0.6244151.5622562.736383e-08
0.6276171.5621272.718412e-08
0.6308361.5619992.700348e-08
0.6340711.5618732.682192e-08
0.6373231.5617472.663943e-08
0.6405921.5616232.645600e-08
0.6438771.56152.627163e-08
0.6471791.5613782.608631e-08
0.651.5612742.592800e-08
0.6504981.5612562.594787e-08
0.6538341.5611362.608091e-08
0.6571871.5610172.621463e-08
0.6605581.5608992.634905e-08
0.6639451.5607822.648415e-08
0.6673511.5606662.661994e-08
0.6707731.5605512.675643e-08
0.6742131.5604362.689362e-08
0.6776711.5603232.703151e-08
0.6811461.5602112.717011e-08
0.684641.5600992.730943e-08
0.6881511.5599892.744945e-08
0.691681.5598792.759020e-08
0.6952271.559772.773166e-08
0.6987931.5596622.787385e-08
0.71.5596262.792200e-08
0.7023761.5595552.771299e-08
0.7059791.5594482.739618e-08
0.7095991.5593432.707775e-08
0.7132381.5592382.675768e-08
0.7168961.5591342.643597e-08
0.7205731.5590312.611261e-08
0.7242681.5589292.578760e-08
0.7279831.5588272.546091e-08
0.7317161.5587262.513255e-08
0.7354691.5586262.480251e-08
0.7392411.5585262.447078e-08
0.7430321.5584282.413734e-08
0.7468431.5583292.380219e-08
0.7506731.5582322.346533e-08
0.7545231.5581352.312673e-08
0.7583921.5580392.278640e-08
0.7622821.5579442.244433e-08
0.7661911.5578492.210050e-08
0.770121.5577552.175491e-08
0.774071.5576612.140754e-08
0.778041.5575682.105840e-08
0.782031.5574762.070746e-08
0.7860411.5573842.035472e-08
0.7900721.5572932.000018e-08
0.7941241.5572021.964381e-08
0.7981961.5571121.928562e-08
0.81.5570721.912700e-08
0.802291.5570221.887120e-08
0.8064051.5569331.841161e-08
0.810541.5568451.794965e-08
0.8146971.5567571.748533e-08
0.8188751.5566691.701863e-08
0.8230751.5565821.654953e-08
0.8272961.5564951.607803e-08
0.8315391.5564091.560411e-08
0.8358031.5563241.512776e-08
0.840091.5562381.464896e-08
0.8443981.5561541.416771e-08
0.8487291.5560691.368399e-08
0.851.5560451.354200e-08
0.8530821.5559851.359106e-08
0.8574571.5559021.366071e-08
0.8618541.5558191.373072e-08
0.8662741.5557361.380108e-08
0.8707171.5556541.387181e-08
0.8751821.5555721.394290e-08
0.8796711.555491.401436e-08
0.8841821.5554091.408618e-08
0.8887171.5553281.415837e-08
0.8932741.5552471.423093e-08
0.8978561.5551671.430386e-08
0.91.5551291.433800e-08
0.902461.5550871.437722e-08
0.9070881.5550071.445099e-08
0.9117411.5549281.452514e-08
0.9164161.5548491.459968e-08
0.9211161.554771.467459e-08
0.925841.5546921.474989e-08
0.9305881.5546131.482558e-08
0.9353611.5545351.490165e-08
0.9401581.5544571.497812e-08
0.944981.554381.505497e-08
0.9498261.5543031.513222e-08
0.951.55431.513500e-08
0.9546971.5542261.520978e-08
0.9595931.5541491.528772e-08
0.9645151.5540721.536607e-08
0.9694611.5539961.544482e-08
0.9744331.5539191.552397e-08
0.979431.5538431.560353e-08
0.9844531.5537671.568350e-08
0.9895021.5536911.576387e-08
0.9945771.5536161.584466e-08
0.9996781.553541.592587e-08
11.5535361.593100e-08
1.00481.5534651.600755e-08
1.009961.553391.608966e-08
1.015141.5533151.617219e-08
1.020341.553241.625514e-08
1.025581.5531651.633851e-08
1.030841.553091.642232e-08
1.036121.5530151.650655e-08
1.041441.552941.659122e-08
1.046781.5528661.667632e-08
1.052151.5527911.676185e-08
1.057541.5527171.684783e-08
1.061.5526831.688700e-08
1.062971.5526421.693425e-08
1.068421.5525681.702113e-08
1.07391.5524941.710844e-08
1.07941.5524191.719621e-08
1.084941.5523451.728443e-08
1.09051.552271.737309e-08
1.09611.5521961.746222e-08
1.101721.5521221.755180e-08
1.107371.5520471.764184e-08
1.113051.5519731.773234e-08
1.118761.5518981.782330e-08
1.124491.5518241.791474e-08
1.130261.5517491.800664e-08
1.136061.5516741.809901e-08
1.141881.55161.819185e-08
1.147741.5515251.828518e-08
1.153621.551451.837898e-08
1.159541.5513751.847326e-08
1.165491.55131.856802e-08
1.171471.5512241.866328e-08
1.177471.5511491.875902e-08
1.183511.5510731.885525e-08
1.189581.5509981.895197e-08
1.195681.5509221.904919e-08
1.21.5508681.911800e-08
1.201811.5508462.108941e-08
1.207981.550772.778706e-08
1.214171.5506933.451907e-08
1.22041.5506174.128559e-08
1.226661.550544.808682e-08
1.232951.5504635.492293e-08
1.239271.5503866.179410e-08
1.245631.5503096.870051e-08
1.252021.5502317.564234e-08
1.258441.5501538.261977e-08
1.264891.5500758.963298e-08
1.271381.5499979.668216e-08
1.27791.5499181.037675e-07
1.284451.549841.108892e-07
1.291041.549761.180474e-07
1.297661.5496811.252423e-07
1.304321.5496011.324741e-07
1.311011.5495211.397430e-07
1.317731.5494411.470491e-07
1.324491.549361.543928e-07
1.331281.5492791.617741e-07
1.338111.5491981.691932e-07
1.344971.5491161.766504e-07
1.351871.5490341.841459e-07
1.35881.5489511.916798e-07
1.365771.5488681.992523e-07
1.372771.5487852.068637e-07
1.379811.5487022.145141e-07
1.386891.5486172.222037e-07
1.3941.5485332.299328e-07
1.41.5484622.364500e-07
1.401151.5484482.357513e-07
1.408341.5483632.313916e-07
1.415561.5482772.270096e-07
1.422821.5481912.226052e-07
1.430121.5481042.181781e-07
1.437451.5480172.137283e-07
1.444821.5479292.092558e-07
1.452231.5478412.047602e-07
1.459681.5477522.002416e-07
1.467171.5476631.956999e-07
1.474691.5475731.911348e-07
1.482251.5474831.865464e-07
1.489861.5473921.819344e-07
1.49751.54731.772988e-07
1.505181.5472081.726393e-07
1.51291.5471151.679560e-07
1.520651.5470221.632487e-07
1.528451.5469281.585172e-07
1.536291.5468341.537615e-07
1.544171.5467391.489814e-07
1.552091.5466431.441767e-07
1.560051.5465471.393474e-07
1.568051.546451.344934e-07
1.576091.5463521.296144e-07
1.584181.5462541.247105e-07
1.59231.5461551.197814e-07
1.61.546061.151100e-07
1.600471.5460551.155848e-07
1.608671.5459541.239376e-07
1.616921.5458531.323334e-07
1.625221.5457511.407722e-07
1.633551.5456481.492542e-07
1.641931.5455451.577798e-07
1.650351.545441.663491e-07
1.658811.5453351.749623e-07
1.667321.5452291.836197e-07
1.675871.5451221.923215e-07
1.684471.5450152.010679e-07
1.693111.5449062.098592e-07
1.701791.5447972.186956e-07
1.710521.5446872.275773e-07
1.719291.5445762.365046e-07
1.728111.5444642.454776e-07
1.736971.5443512.544966e-07
1.745881.5442372.635619e-07
1.754831.5441222.726737e-07
1.763831.5440072.818322e-07
1.772881.543892.910377e-07
1.781971.5437723.002904e-07
1.791111.5436533.095906e-07
1.81.5435383.186400e-07
1.800291.5435343.191741e-07
1.809531.5434133.359894e-07
1.818811.5432913.528909e-07
1.828131.5431683.698791e-07
1.837511.5430443.869545e-07
1.846931.5429194.041174e-07
1.856411.5427934.213683e-07
1.865931.5426664.387077e-07
1.87551.5425384.561360e-07
1.885111.5424084.736537e-07
1.894781.5422774.912613e-07
1.90451.5421455.089591e-07
1.914271.5420125.267477e-07
1.924081.5418785.446276e-07
1.933951.5417425.625991e-07
1.943871.5416065.806628e-07
1.953841.5414675.988192e-07
1.963861.5413286.170686e-07
1.973931.5411876.354117e-07
1.984051.5410456.538488e-07
1.994231.5409026.723805e-07
21.540826.828900e-07
2.004461.5407577.220043e-07
2.014741.5406118.122211e-07
2.025071.5404639.029006e-07
2.035461.5403149.940452e-07
2.045891.5401641.085657e-06
2.056391.5400121.177739e-06
2.066931.5398591.270293e-06
2.077531.5397041.363322e-06
2.088191.5395471.456828e-06
2.09891.5393891.550813e-06
2.109661.539231.645280e-06
2.120481.5390691.740232e-06
2.131361.5389061.835671e-06
2.142291.5387421.931599e-06
2.153271.5385762.028019e-06
2.164321.5384082.124934e-06
2.175421.5382392.222346e-06
2.186571.5380672.320257e-06
2.197791.5378952.418671e-06
2.21.537862.438100e-06
2.209061.537722.505682e-06
2.220391.5375442.590215e-06
2.231771.5373652.675181e-06
2.243221.5371852.760583e-06
2.254721.5370032.846423e-06
2.266291.5368192.932704e-06
2.277911.5366343.019426e-06
2.289591.5364463.106594e-06
2.301331.5362563.194208e-06
2.313141.5360653.282272e-06
2.3251.5358713.370787e-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
—