Optical constants

Refractive index of D-LAF79-25 (CDGM)

D-LAF79-25: n,k 0.365–2.325 µm

Data
formula 2 + tabulated k
Range
0.365–2.325 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.365–2.325 µm
Refractive index n
1.72986
Extinction coefficient k
2.45299e-08
Permittivity ε1
2.9924
Permittivity ε2
8.48665e-08
Absorption coefficient α
0.00524595 cm⁻¹
Penetration depth δ = λ/(2πk)
3.81246e+09 nm
Abbe number Vd
40.498
Chromatic dispersion dn/dλ
-0.0918755 µm⁻¹
Group index ng
1.78384
Group velocity dispersion
173.493 fs²/mm
Dispersion parameter D
-946.496 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-LAF79-25 (CDGM): D-LAF79-25
cdgm_d_laf79_25 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-LAF79-25", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_laf79_25.range_nm)  # (365, 2325) nm
eps = cdgm_d_laf79_25.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=0.244124156λ2λ2−0.0430784572+1.39592511λ2λ2−113.324709+1.66977539λ2λ2−0.00964211165

Valid from 0.365 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C20.244124156
C30.0430784572
C41.39592511
C5113.324709
C61.66977539
C70.00964211165

Comments and conditions

anneal rate:25°C/h

Conditions

temperature
293 K

Properties

nd
1.729860
Vd
40.497566
glass code
730405
density
value: 3210
thermal expansion
value: 9e-06, temperature range: 243 343; value: 1.11e-05, temperature range: 293 573
dPgF
-0.0049
resistance
climatic: 3.0

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 425 wavelengths, the same grid as the API and the library
D-LAF79-25 (CDGM), D-LAF79-25: n and k versus wavelength
λ (µm)nk
0.3651.7774128.809100e-07
0.3666981.7765978.048888e-07
0.3684031.7757937.285140e-07
0.371.7750546.570200e-07
0.3701171.7750016.545063e-07
0.3718381.7742196.174984e-07
0.3735681.7734485.803184e-07
0.3753061.7726885.429655e-07
0.3770511.7719385.054388e-07
0.3788051.7711994.677376e-07
0.381.7707024.420500e-07
0.3805671.7704694.343568e-07
0.3823371.7697494.103395e-07
0.3841161.7690393.862105e-07
0.3859021.7683383.619693e-07
0.3876971.7676473.376153e-07
0.38951.7669643.131480e-07
0.391.7667783.063700e-07
0.3913121.7662912.942406e-07
0.3931321.7656272.774154e-07
0.3949611.7649712.605119e-07
0.3967981.7643232.435298e-07
0.3986441.7636842.264688e-07
0.41.7632212.139300e-07
0.4004981.7630532.119146e-07
0.4023611.762432.043729e-07
0.4042321.7618151.967961e-07
0.4061121.7612081.891840e-07
0.4080011.7606091.815366e-07
0.4098991.7600171.738535e-07
0.4118061.7594321.661348e-07
0.4137211.7588551.583801e-07
0.4156451.7582841.505893e-07
0.4175791.7577211.427624e-07
0.4195211.7571651.348990e-07
0.421.7570291.329600e-07
0.4214721.7566161.304921e-07
0.4234331.7560731.272063e-07
0.4254021.7555371.239052e-07
0.4273811.7550071.205887e-07
0.4293691.7544841.172568e-07
0.4313661.7539671.139094e-07
0.4333721.7534561.105464e-07
0.4353881.7529511.071678e-07
0.4374131.7524521.037735e-07
0.4394481.751961.003633e-07
0.441.7518279.943800e-08
0.4414921.7514739.753690e-08
0.4435451.7509919.492020e-08
0.4456091.7505159.229132e-08
0.4476811.7500458.965022e-08
0.4497641.7495818.699683e-08
0.4518561.7491218.433110e-08
0.4539571.7486678.165298e-08
0.4560691.7482187.896239e-08
0.458191.7477757.625929e-08
0.461.7474027.395300e-08
0.4603211.7473367.363014e-08
0.4624621.7469027.147843e-08
0.4646131.7464746.931672e-08
0.4667751.746056.714495e-08
0.4689461.7456316.496308e-08
0.4711271.7452166.277106e-08
0.4733181.7448076.056885e-08
0.475521.7444025.835639e-08
0.4777321.7440015.613364e-08
0.4799541.7436055.390056e-08
0.481.7435965.385400e-08
0.4821861.7432135.233849e-08
0.4844291.7428255.078366e-08
0.4866821.7424424.922161e-08
0.4889461.7420634.765228e-08
0.491221.7416884.607566e-08
0.4935051.7413174.449170e-08
0.49581.740954.290038e-08
0.4981071.7405874.130165e-08
0.51.7402933.998900e-08
0.5004231.7402283.987343e-08
0.5027511.7398733.923803e-08
0.5050891.7395223.859967e-08
0.5074391.7391743.795835e-08
0.5097991.738833.731405e-08
0.512171.738493.666675e-08
0.5145531.7381533.601643e-08
0.5169461.737823.536309e-08
0.519351.7374913.470672e-08
0.5217661.7371643.404729e-08
0.5241931.7368423.338479e-08
0.5266311.7365223.271921e-08
0.5290811.7362063.205054e-08
0.5315421.7358933.137875e-08
0.5340141.7355843.070384e-08
0.5364981.7352783.002580e-08
0.5389931.7349742.934459e-08
0.54151.7346742.866022e-08
0.5440191.7343772.797267e-08
0.5465491.7340832.728192e-08
0.5490921.7337922.658795e-08
0.551.7336892.634000e-08
0.5516461.7335042.626078e-08
0.5542121.7332192.613725e-08
0.5567891.7329362.601316e-08
0.5593791.7326572.588848e-08
0.5619811.732382.576323e-08
0.5645951.7321062.563740e-08
0.5672211.7318352.551097e-08
0.5698591.7315662.538396e-08
0.572511.73132.525636e-08
0.5751731.7310372.512817e-08
0.5778481.7307762.499938e-08
0.5805361.7305182.486999e-08
0.5832361.7302622.474000e-08
0.5859491.7300092.460941e-08
0.5886751.7297582.447820e-08
0.5914131.729512.434639e-08
0.5941641.7292642.421396e-08
0.5969271.729022.408092e-08
0.5997041.7287792.394726e-08
0.61.7287532.393300e-08
0.6024931.728542.377339e-08
0.6052961.7283032.359398e-08
0.6081111.7280682.341373e-08
0.610941.7278362.323265e-08
0.6137811.7276062.305073e-08
0.6166361.7273782.286796e-08
0.6195041.7271522.268434e-08
0.6223861.7269282.249986e-08
0.6252811.7267072.231453e-08
0.6281891.7264872.212833e-08
0.6311111.7262692.194127e-08
0.6340471.7260542.175334e-08
0.6369961.725842.156454e-08
0.6399591.7256282.137485e-08
0.6429351.7254192.118429e-08
0.6459261.7252112.099283e-08
0.648931.7250052.080049e-08
0.651.7249322.073200e-08
0.6519491.72482.035866e-08
0.6549811.7245981.977765e-08
0.6580281.7243971.919393e-08
0.6610881.7241981.860750e-08
0.6641631.7240011.801834e-08
0.6672521.7238061.742644e-08
0.6703561.7236121.683179e-08
0.6734741.723421.623437e-08
0.6766071.723231.563418e-08
0.6797541.7230411.503119e-08
0.6829151.7228541.442539e-08
0.6860921.7226691.381678e-08
0.6892831.7224851.320534e-08
0.6924891.7223021.259106e-08
0.695711.7221211.197391e-08
0.6989461.7219421.135390e-08
0.71.7218841.115200e-08
0.7021971.7217641.118700e-08
0.7054631.7215881.123903e-08
0.7087451.7214131.129130e-08
0.7120411.721241.134382e-08
0.7153531.7210681.139658e-08
0.7186811.7208971.144958e-08
0.7220231.7207281.150283e-08
0.7253821.720561.155633e-08
0.7287561.7203931.161008e-08
0.7321461.7202281.166408e-08
0.7355511.7200641.171833e-08
0.7389721.7199011.177283e-08
0.7424091.719741.182758e-08
0.7458631.719581.188259e-08
0.7493321.7194211.193786e-08
0.7528171.7192631.199338e-08
0.7563191.7191071.204916e-08
0.7598371.7189521.210520e-08
0.7633711.7187981.216150e-08
0.7669221.7186451.221806e-08
0.7704891.7184931.227489e-08
0.7740731.7183421.233198e-08
0.7776731.7181931.238933e-08
0.781291.7180441.244696e-08
0.7849241.7178971.250485e-08
0.7885751.717751.256301e-08
0.7922431.7176051.262144e-08
0.7959281.7174611.268014e-08
0.799631.7173171.273911e-08
0.81.7173031.274500e-08
0.803351.7171751.279840e-08
0.8070861.7170341.285796e-08
0.810841.7168941.291780e-08
0.8146121.7167541.297791e-08
0.8184011.7166161.303831e-08
0.8222081.7164781.309899e-08
0.8260321.7163421.315995e-08
0.8298741.7162061.322119e-08
0.8337341.7160711.328272e-08
0.8376121.7159371.334454e-08
0.8415081.7158041.340664e-08
0.8454221.7156721.346903e-08
0.8493551.7155411.353171e-08
0.851.7155191.354200e-08
0.8533051.715411.359462e-08
0.8572741.715281.365781e-08
0.8612621.7151521.372129e-08
0.8652681.7150231.378506e-08
0.8692921.7148961.384913e-08
0.8733361.7147691.391350e-08
0.8773981.7146431.397817e-08
0.8814791.7145181.404315e-08
0.8855791.7143941.410842e-08
0.8896981.714271.417399e-08
0.8938361.7141471.423988e-08
0.8979941.7140241.430606e-08
0.91.7139661.433800e-08
0.9021711.7139031.437260e-08
0.9063671.7137821.443949e-08
0.9105831.7136611.450669e-08
0.9148181.7135411.457420e-08
0.9190731.7134221.464203e-08
0.9233481.7133041.471017e-08
0.9276431.7131861.477863e-08
0.9319581.7130681.484741e-08
0.9362931.7129521.491651e-08
0.9406481.7128351.498593e-08
0.9450231.712721.505567e-08
0.9494191.7126041.512573e-08
0.951.7125891.513500e-08
0.9538351.712491.519605e-08
0.9582711.7123761.526668e-08
0.9627291.7122621.533764e-08
0.9672071.7121491.540893e-08
0.9717051.7120361.548055e-08
0.9762251.7119241.555250e-08
0.9807661.7118131.562479e-08
0.9853281.7117011.569742e-08
0.9899111.7115911.577038e-08
0.9945151.711481.584368e-08
0.9991411.711371.591732e-08
11.711351.593100e-08
1.003791.7112611.599136e-08
1.008461.7111521.606575e-08
1.013151.7110431.614049e-08
1.017861.7109351.621558e-08
1.022591.7108271.629101e-08
1.027351.7107191.636680e-08
1.032131.7106121.644293e-08
1.036931.7105051.651943e-08
1.041751.7103981.659628e-08
1.04661.7102921.667348e-08
1.051471.7101861.675105e-08
1.056361.710081.682897e-08
1.061.7100021.688700e-08
1.061271.7099751.690726e-08
1.066211.709871.698593e-08
1.071171.7097651.706496e-08
1.076151.709661.714435e-08
1.081151.7095561.722412e-08
1.086181.7094521.730426e-08
1.091241.7093481.738477e-08
1.096311.7092441.746565e-08
1.101411.7091411.754691e-08
1.106531.7090371.762855e-08
1.111681.7089341.771057e-08
1.116851.7088311.779297e-08
1.122051.7087291.787576e-08
1.127271.7086261.795892e-08
1.132511.7085241.804248e-08
1.137781.7084211.812642e-08
1.143071.7083191.821076e-08
1.148391.7082171.829549e-08
1.153731.7081151.838061e-08
1.159091.7080131.846612e-08
1.164481.7079121.855204e-08
1.16991.707811.863835e-08
1.175341.7077081.872507e-08
1.180811.7076071.881219e-08
1.18631.7075051.889971e-08
1.191821.7074041.898764e-08
1.197361.7073031.907598e-08
1.21.7072541.911800e-08
1.202931.7072011.916472e-08
1.208531.70711.925385e-08
1.214151.7069981.934340e-08
1.21981.7068971.943336e-08
1.225471.7067961.952374e-08
1.231171.7066941.961454e-08
1.23691.7065931.970577e-08
1.242651.7064921.979742e-08
1.248431.706391.988949e-08
1.254241.7062881.998199e-08
1.260071.7061872.007493e-08
1.265931.7060852.016829e-08
1.271821.7059832.026209e-08
1.277741.7058812.035633e-08
1.283681.7057792.045101e-08
1.289651.7056772.054612e-08
1.295651.7055752.064168e-08
1.301671.7054732.073768e-08
1.307731.705372.083413e-08
1.313811.7052672.093103e-08
1.319921.7051652.102837e-08
1.326061.7050622.112617e-08
1.332231.7049582.122443e-08
1.338431.7048552.132314e-08
1.344651.7047512.142231e-08
1.350911.7046472.152195e-08
1.357191.7045432.162204e-08
1.36351.7044392.172260e-08
1.369851.7043352.182363e-08
1.376221.704232.192513e-08
1.382621.7041252.202711e-08
1.389051.7040192.212955e-08
1.395511.7039142.223247e-08
1.41.7038412.230400e-08
1.4021.7038082.233588e-08
1.408521.7037022.243976e-08
1.415071.7035952.254412e-08
1.421661.7034882.264897e-08
1.428271.7033812.275431e-08
1.434911.7032742.286014e-08
1.441591.7031662.296646e-08
1.448291.7030582.307328e-08
1.455031.7029492.318059e-08
1.46181.702842.328840e-08
1.468591.702732.339671e-08
1.475431.7026212.350553e-08
1.482291.702512.361485e-08
1.489181.70242.372468e-08
1.496111.7022892.383503e-08
1.503071.7021772.394588e-08
1.510061.7020652.405725e-08
1.517081.7019532.416914e-08
1.524141.701842.428155e-08
1.531231.7017262.439448e-08
1.538351.7016122.450794e-08
1.545511.7014982.462193e-08
1.55271.7013832.473644e-08
1.559921.7012672.485149e-08
1.567171.7011512.496707e-08
1.574461.7010352.508319e-08
1.581791.7009172.519985e-08
1.589141.70082.531706e-08
1.596541.7006812.543481e-08
1.61.7006262.549000e-08
1.603961.7005622.669249e-08
1.611421.7004432.895725e-08
1.618921.7003223.123255e-08
1.626451.7002023.351843e-08
1.634011.700083.581494e-08
1.641611.6999583.812214e-08
1.649251.6998354.044006e-08
1.656921.6997124.276877e-08
1.664631.6995874.510831e-08
1.672371.6994624.745873e-08
1.680151.6993374.982008e-08
1.687961.699215.219242e-08
1.695811.6990835.457579e-08
1.70371.6989555.697025e-08
1.711631.6988265.937584e-08
1.719591.6986976.179263e-08
1.727591.6985676.422065e-08
1.735621.6984366.665997e-08
1.743691.6983046.911064e-08
1.751811.6981717.157270e-08
1.759951.6980377.404622e-08
1.768141.6979037.653124e-08
1.776361.6977677.902782e-08
1.784631.6976318.153601e-08
1.792931.6974948.405587e-08
1.81.6973778.620300e-08
1.801271.6973568.789906e-08
1.809641.6972179.911955e-08
1.818061.6970771.103922e-07
1.826521.6969361.217173e-07
1.835011.6967941.330951e-07
1.843551.6966511.445259e-07
1.852121.6965071.560097e-07
1.860741.6963621.675470e-07
1.869391.6962161.791380e-07
1.878091.6960691.907829e-07
1.886821.6959212.024819e-07
1.89561.6957722.142354e-07
1.904421.6956222.260435e-07
1.913281.695472.379065e-07
1.922181.6953182.498248e-07
1.931121.6951642.617984e-07
1.94011.6950092.738278e-07
1.949121.6948532.859131e-07
1.958191.6946962.980546e-07
1.96731.6945383.102526e-07
1.976451.6943783.225073e-07
1.985641.6942173.348191e-07
1.994881.6940553.471881e-07
21.6939653.540500e-07
2.004161.6938923.676547e-07
2.013481.6937273.981772e-07
2.022841.6935614.288417e-07
2.032251.6933944.596488e-07
2.04171.6932254.905993e-07
2.05121.6930555.216936e-07
2.060741.6928845.529326e-07
2.070331.6927115.843169e-07
2.079961.6925366.158472e-07
2.089631.6923616.475242e-07
2.099351.6921846.793484e-07
2.109121.6920057.113207e-07
2.118931.6918257.434418e-07
2.128781.6916437.757122e-07
2.138681.691468.081327e-07
2.148631.6912758.407040e-07
2.158621.6910898.734269e-07
2.168671.6909019.063019e-07
2.178751.6907119.393298e-07
2.188891.690529.725114e-07
2.199071.6903271.005847e-06
2.21.690311.008900e-06
2.20931.6901331.147972e-06
2.219571.6899361.301703e-06
2.22991.6897381.456150e-06
2.240271.6895391.611315e-06
2.250691.6893371.767201e-06
2.261161.6891341.923813e-06
2.271671.6889292.081153e-06
2.282241.6887222.239225e-06
2.292861.6885132.398033e-06
2.303521.6883022.557578e-06
2.314241.688092.717866e-06
2.3251.6878752.878900e-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
—