Optical constants

Refractive index of D-LAF50 (CDGM)

D-LAF50: 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
1.774
Extinction coefficient k
1.87414e-08
Permittivity ε1
3.14707
Permittivity ε2
6.64945e-08
Absorption coefficient α
0.00400803 cm⁻¹
Penetration depth δ = λ/(2πk)
4.98998e+09 nm
Abbe number Vd
49.59
Chromatic dispersion dn/dλ
-0.0801615 µm⁻¹
Group index ng
1.8211
Group velocity dispersion
146.138 fs²/mm
Dispersion parameter D
-797.259 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-LAF50 (CDGM): D-LAF50
cdgm_d_laf50 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-LAF50", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_laf50.range_nm)  # (302, 2325) nm
eps = cdgm_d_laf50.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=1.34473873λ2λ2−0.006036194+1.13288204λ2λ2−95.5213185+0.731048914λ2λ2−0.022706198

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.34473873
C30.006036194
C41.13288204
C595.5213185
C60.731048914
C70.022706198

Comments and conditions

anneal rate:4°C/h

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.53e-06 1.43e-08 -3.83e-11 5.87e-07 4.1e-10 0.222
nd
1.774000
Vd
49.590362
glass code
774496
glass status
standard
density
value: 4930
thermal expansion
value: 7.3e-06, temperature range: 243 343; value: 8.9e-06, temperature range: 293 573
dPgF
-0.0065
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 1.93e-06 K⁻¹ at 633 nm, dn/dT = 1.11e-06 K⁻¹ at 1310 nm, dn/dT = 1.05e-06 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-LAF50 (CDGM), D-LAF50: n and k versus wavelength
λ (µm)nk
0.3021.8472545.884780e-06
0.3035491.8460835.701850e-06
0.3051061.844935.517982e-06
0.306671.8437945.333170e-06
0.3082431.8426755.147411e-06
0.3098241.8415724.960699e-06
0.311.8414514.939900e-06
0.3114131.8404864.638670e-06
0.313011.8394154.298155e-06
0.3146151.8383593.955894e-06
0.3162291.8373193.611878e-06
0.317851.8362933.266097e-06
0.3194811.8352832.918544e-06
0.321.8349652.807800e-06
0.3211191.8342862.698469e-06
0.3227661.8333042.537570e-06
0.3244211.8323352.375846e-06
0.3260851.831382.213293e-06
0.3277571.8304392.049906e-06
0.3294381.829511.885682e-06
0.331.8292041.830800e-06
0.3311281.8285951.753433e-06
0.3328261.8276921.636937e-06
0.3345331.8268011.519844e-06
0.3362491.8259231.402150e-06
0.3379731.8250571.283852e-06
0.3397061.8242021.164948e-06
0.341.8240591.144800e-06
0.3414481.823361.078182e-06
0.34321.8225289.976465e-07
0.344961.8217089.166975e-07
0.3467291.8208998.353334e-07
0.3485071.82017.535520e-07
0.351.8194416.848900e-07
0.3502941.8193126.765696e-07
0.3520911.8185356.257937e-07
0.3538971.8177685.747572e-07
0.3557121.8170115.234591e-07
0.3575361.8162644.718979e-07
0.3593691.8155274.200722e-07
0.361.8152764.022500e-07
0.3612121.8147993.813107e-07
0.3630651.8140813.493183e-07
0.3649271.8133723.171618e-07
0.3667981.8126732.848404e-07
0.368681.8119822.523533e-07
0.371.8115052.295500e-07
0.370571.8113012.243983e-07
0.3724711.8106282.072332e-07
0.3743811.8099631.899801e-07
0.3763011.8093071.726385e-07
0.3782311.808661.552079e-07
0.381.8080761.392300e-07
0.3801711.808021.384669e-07
0.382121.8073891.297519e-07
0.384081.8067661.209921e-07
0.386051.806151.121875e-07
0.388031.8055431.033377e-07
0.391.8049489.453100e-08
0.390021.8049429.447762e-08
0.392021.804358.908222e-08
0.394031.8037648.365915e-08
0.3960511.8031867.820827e-08
0.3980821.8026157.272943e-08
0.41.8020856.755700e-08
0.4001241.8020516.740928e-08
0.4021761.8014946.496499e-08
0.4042391.8009446.250817e-08
0.4063121.8004016.003874e-08
0.4083961.7998645.755665e-08
0.410491.7993335.506183e-08
0.4125951.798815.255422e-08
0.4147111.7982925.003375e-08
0.4168381.7977814.750034e-08
0.4189761.7972754.495395e-08
0.421.7970364.373400e-08
0.4211251.7967764.325359e-08
0.4232841.7962834.233095e-08
0.4254551.7957964.140358e-08
0.4276371.7953144.047145e-08
0.429831.7948393.953454e-08
0.4320351.7943683.859282e-08
0.434251.7939043.764628e-08
0.4364771.7934453.669488e-08
0.4387161.7929913.573860e-08
0.441.7927343.519000e-08
0.4409661.7925433.473241e-08
0.4432271.7920993.366091e-08
0.44551.7916613.258392e-08
0.4477851.7912293.150140e-08
0.4500821.7908013.041333e-08
0.452391.7903782.931968e-08
0.454711.789962.822042e-08
0.4570421.7895472.711553e-08
0.4593861.7891382.600496e-08
0.461.7890322.571400e-08
0.4617421.7887342.514197e-08
0.464111.7883352.436431e-08
0.466491.787942.358265e-08
0.4688831.787552.279699e-08
0.4712871.7871652.200729e-08
0.4737041.7867832.121355e-08
0.4761341.7864062.041573e-08
0.4785751.7860341.961383e-08
0.481.7858191.914600e-08
0.481031.7856651.898128e-08
0.4834971.78531.858669e-08
0.4859761.784941.819007e-08
0.4884691.7845841.779142e-08
0.4909741.7842311.739073e-08
0.4934921.7838831.698798e-08
0.4960231.7835381.658317e-08
0.4985671.7831971.617628e-08
0.51.7830081.594700e-08
0.5011231.782861.598284e-08
0.5036931.7825271.606482e-08
0.5062771.7821971.614723e-08
0.5088731.7818711.623005e-08
0.5114831.7815491.631330e-08
0.5141061.781231.639698e-08
0.5167431.7809141.648109e-08
0.5193931.7806021.656563e-08
0.5220561.7802931.665060e-08
0.5247341.7799881.673601e-08
0.5274251.7796861.682186e-08
0.530131.7793871.690814e-08
0.5328491.7790911.699487e-08
0.5355811.7787981.708205e-08
0.5383281.7785091.716967e-08
0.5410891.7782231.725774e-08
0.5438641.7779391.734626e-08
0.5466531.7776591.743524e-08
0.5494571.7773811.752467e-08
0.551.7773281.754200e-08
0.5522751.7771071.761456e-08
0.5551071.7768351.770491e-08
0.5579541.7765661.779573e-08
0.5608151.77631.788701e-08
0.5636911.7760371.797876e-08
0.5665821.7757771.807098e-08
0.5694881.7755191.816367e-08
0.5724091.7752641.825684e-08
0.5753441.7750111.835048e-08
0.5782951.7747611.844461e-08
0.5812611.7745131.853922e-08
0.5842421.7742691.863431e-08
0.5872381.7740261.872989e-08
0.590251.7737861.882596e-08
0.5932771.7735481.892253e-08
0.5963191.7733131.901959e-08
0.5993781.773081.911715e-08
0.61.7730331.913700e-08
0.6024521.772851.896068e-08
0.6055411.7726211.873847e-08
0.6086471.7723951.851512e-08
0.6117681.7721721.829063e-08
0.6149061.771951.806498e-08
0.6180591.7717311.783818e-08
0.6212291.7715131.761021e-08
0.6244151.7712981.738108e-08
0.6276171.7710851.715077e-08
0.6308361.7708741.691927e-08
0.6340711.7706651.668659e-08
0.6373231.7704581.645272e-08
0.6405921.7702531.621765e-08
0.6438771.770051.598137e-08
0.6471791.7698491.574388e-08
0.651.7696791.554100e-08
0.6504981.769651.555291e-08
0.6538341.7694521.563264e-08
0.6571871.7692571.571278e-08
0.6605581.7690631.579333e-08
0.6639451.7688711.587430e-08
0.6673511.7686811.595568e-08
0.6707731.7684921.603748e-08
0.6742131.7683061.611969e-08
0.6776711.7681211.620233e-08
0.6811461.7679371.628540e-08
0.684641.7677561.636889e-08
0.6881511.7675761.645280e-08
0.691681.7673971.653715e-08
0.6952271.767221.662193e-08
0.6987931.7670451.670715e-08
0.71.7669861.673600e-08
0.7023761.7668711.664115e-08
0.7059791.7666991.649739e-08
0.7095991.7665281.635289e-08
0.7132381.7663591.620765e-08
0.7168961.7661911.606167e-08
0.7205731.7660251.591494e-08
0.7242681.765861.576745e-08
0.7279831.7656971.561921e-08
0.7317161.7655341.547020e-08
0.7354691.7653741.532044e-08
0.7392411.7652141.516990e-08
0.7430321.7650561.501859e-08
0.7468431.7648991.486651e-08
0.7506731.7647431.471365e-08
0.7545231.7645891.456000e-08
0.7583921.7644361.440557e-08
0.7622821.7642841.425034e-08
0.7661911.7641331.409432e-08
0.770121.7639841.393749e-08
0.774071.7638351.377987e-08
0.778041.7636881.362143e-08
0.782031.7635421.346218e-08
0.7860411.7633971.330212e-08
0.7900721.7632531.314123e-08
0.7941241.7631111.297952e-08
0.7981961.7629691.281698e-08
0.81.7629071.274500e-08
0.802291.7628281.278150e-08
0.8064051.7626891.284709e-08
0.810541.762551.291301e-08
0.8146971.7624121.297927e-08
0.8188751.7622761.304587e-08
0.8230751.762141.311281e-08
0.8272961.7620051.318010e-08
0.8315391.7618711.324773e-08
0.8358031.7617391.331571e-08
0.840091.7616071.338403e-08
0.8443981.7614751.345271e-08
0.8487291.7613451.352174e-08
0.851.7613071.354200e-08
0.8530821.7612161.359106e-08
0.8574571.7610871.366071e-08
0.8618541.7609591.373072e-08
0.8662741.7608331.380108e-08
0.8707171.7607061.387181e-08
0.8751821.7605811.394290e-08
0.8796711.7604561.401436e-08
0.8841821.7603331.408618e-08
0.8887171.7602091.415837e-08
0.8932741.7600871.423093e-08
0.8978561.7599651.430386e-08
0.91.7599091.433800e-08
0.902461.7598441.437722e-08
0.9070881.7597241.445099e-08
0.9117411.7596041.452514e-08
0.9164161.7594851.459968e-08
0.9211161.7593671.467459e-08
0.925841.7592491.474989e-08
0.9305881.7591321.482558e-08
0.9353611.7590161.490165e-08
0.9401581.75891.497812e-08
0.944981.7587841.505497e-08
0.9498261.7586691.513222e-08
0.951.7586651.513500e-08
0.9546971.7585551.520978e-08
0.9595931.7584411.528772e-08
0.9645151.7583281.536607e-08
0.9694611.7582151.544482e-08
0.9744331.7581031.552397e-08
0.979431.7579911.560353e-08
0.9844531.757881.568350e-08
0.9895021.7577691.576387e-08
0.9945771.7576591.584466e-08
0.9996781.7575491.592587e-08
11.7575421.593100e-08
1.00481.7574391.600755e-08
1.009961.757331.608966e-08
1.015141.7572211.617219e-08
1.020341.7571131.625514e-08
1.025581.7570051.633851e-08
1.030841.7568971.642232e-08
1.036121.756791.650655e-08
1.041441.7566831.659122e-08
1.046781.7565761.667632e-08
1.052151.756471.676185e-08
1.057541.7563641.684783e-08
1.061.7563161.688700e-08
1.062971.7562581.693425e-08
1.068421.7561521.702113e-08
1.07391.7560471.710844e-08
1.07941.7559421.719621e-08
1.084941.7558371.728443e-08
1.09051.7557331.737309e-08
1.09611.7556281.746222e-08
1.101721.7555241.755180e-08
1.107371.755421.764184e-08
1.113051.7553161.773234e-08
1.118761.7552121.782330e-08
1.124491.7551091.791474e-08
1.130261.7550051.800664e-08
1.136061.7549021.809901e-08
1.141881.7547991.819185e-08
1.147741.7546961.828518e-08
1.153621.7545931.837898e-08
1.159541.754491.847326e-08
1.165491.7543871.856802e-08
1.171471.7542851.866328e-08
1.177471.7541821.875902e-08
1.183511.7540791.885525e-08
1.189581.7539771.895197e-08
1.195681.7538741.904919e-08
1.21.7538021.911800e-08
1.201811.7537711.914690e-08
1.207981.7536691.924509e-08
1.214171.7535661.934377e-08
1.22041.7534631.944297e-08
1.226661.7533611.954267e-08
1.232951.7532581.964289e-08
1.239271.7531551.974361e-08
1.245631.7530521.984486e-08
1.252021.7529491.994662e-08
1.258441.7528462.004891e-08
1.264891.7527422.015172e-08
1.271381.7526392.025506e-08
1.27791.7525352.035893e-08
1.284451.7524322.046333e-08
1.291041.7523282.056826e-08
1.297661.7522242.067374e-08
1.304321.7521192.077975e-08
1.311011.7520152.088631e-08
1.317731.751912.099342e-08
1.324491.7518052.110107e-08
1.331281.75172.120928e-08
1.338111.7515952.131804e-08
1.344971.7514892.142736e-08
1.351871.7513832.153724e-08
1.35881.7512772.164769e-08
1.365771.7511712.175870e-08
1.372771.7510642.187028e-08
1.379811.7509572.198243e-08
1.386891.7508492.209515e-08
1.3941.7507412.220846e-08
1.41.7506512.230400e-08
1.401151.7506332.239585e-08
1.408341.7505252.296896e-08
1.415561.7504162.354500e-08
1.422821.7503062.412400e-08
1.430121.7501972.470597e-08
1.437451.7500862.529092e-08
1.444821.7499762.587888e-08
1.452231.7498652.646984e-08
1.459681.7497532.706384e-08
1.467171.7496412.766089e-08
1.474691.7495292.826100e-08
1.482251.7494162.886418e-08
1.489861.7493022.947046e-08
1.49751.7491883.007985e-08
1.505181.7490743.069236e-08
1.51291.7489593.130802e-08
1.520651.7488433.192683e-08
1.528451.7487273.254881e-08
1.536291.748613.317399e-08
1.544171.7484923.380237e-08
1.552091.7483743.443397e-08
1.560051.7482553.506882e-08
1.568051.7481363.570692e-08
1.576091.7480163.634829e-08
1.584181.7478953.699295e-08
1.59231.7477743.764092e-08
1.61.7476593.825500e-08
1.600471.7476523.840047e-08
1.608671.7475294.095994e-08
1.616921.7474054.353253e-08
1.625221.7472814.611831e-08
1.633551.7471564.871736e-08
1.641931.747035.132973e-08
1.650351.7469035.395551e-08
1.658811.7467755.659475e-08
1.667321.7466475.924752e-08
1.675871.7465186.191390e-08
1.684471.7463886.459395e-08
1.693111.7462576.728775e-08
1.701791.7461256.999537e-08
1.710521.7459927.271687e-08
1.719291.7458587.545232e-08
1.728111.7457247.820181e-08
1.736971.7455888.096540e-08
1.745881.7454518.374316e-08
1.754831.7453148.653516e-08
1.763831.7451758.934149e-08
1.772881.7450369.216220e-08
1.781971.7448959.499739e-08
1.791111.7447539.784711e-08
1.81.7446151.006200e-07
1.800291.744611.010394e-07
1.809531.7444671.142428e-07
1.818811.7443211.275139e-07
1.828131.7441751.408531e-07
1.837511.7440281.542607e-07
1.846931.7438791.677371e-07
1.856411.743731.812825e-07
1.865931.7435791.948975e-07
1.87551.7434272.085822e-07
1.885111.7432732.223372e-07
1.894781.7431192.361627e-07
1.90451.7429632.500591e-07
1.914271.7428052.640267e-07
1.924081.7426472.780660e-07
1.933951.7424872.921773e-07
1.943871.7423263.063610e-07
1.953841.7421633.206174e-07
1.963861.7419993.349469e-07
1.973931.7418333.493499e-07
1.984051.7416663.638268e-07
1.994231.7414983.783779e-07
21.7414023.866300e-07
2.004461.7413284.017384e-07
2.014741.7411564.365856e-07
2.025071.7409834.716116e-07
2.035461.7408085.068172e-07
2.045891.7406325.422034e-07
2.056391.7404545.777711e-07
2.066931.7402756.135211e-07
2.077531.7400936.494546e-07
2.088191.7399116.855723e-07
2.09891.7397267.218752e-07
2.109661.739547.583643e-07
2.120481.7393527.950405e-07
2.131361.7391628.319049e-07
2.142291.738978.689583e-07
2.153271.7387769.062017e-07
2.164321.7385819.436361e-07
2.175421.7383849.812625e-07
2.186571.7381841.019082e-06
2.197791.7379831.057095e-06
2.21.7379431.064600e-06
2.209061.737781.218084e-06
2.220391.7375751.410062e-06
2.231771.7373671.603026e-06
2.243221.7371581.796978e-06
2.254721.7369461.991926e-06
2.266291.7367332.187873e-06
2.277911.7365172.384826e-06
2.289591.7362992.582788e-06
2.301331.7360792.781766e-06
2.313141.7358572.981764e-06
2.3251.7356323.182788e-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
—