Optical constants

Refractive index of D-LAK52 (CDGM)

D-LAK52: 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
1.7305
Extinction coefficient k
9.36134e-09
Permittivity ε1
2.99462
Permittivity ε2
3.23996e-08
Absorption coefficient α
0.00200201 cm⁻¹
Penetration depth δ = λ/(2πk)
9.98996e+09 nm
Abbe number Vd
53.944
Chromatic dispersion dn/dλ
-0.0698805 µm⁻¹
Group index ng
1.77156
Group velocity dispersion
122.869 fs²/mm
Dispersion parameter D
-670.314 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-LAK52 (CDGM): D-LAK52
cdgm_d_lak52 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-LAK52", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_lak52.range_nm)  # (302, 2325) nm
eps = cdgm_d_lak52.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=1.04647517λ2λ2−0.0173536556+0.889910862λ2λ2−0.00298398431+1.23173612λ2λ2−87.1100488

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.04647517
C30.0173536556
C40.889910862
C50.00298398431
C61.23173612
C787.1100488

Comments and conditions

anneal rate:4°C/h

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.8e-06 1.72e-08 -5.24e-11 4.52e-07 1.37e-10 0.229
nd
1.730500
Vd
53.944268
glass code
731539
density
value: 4000
thermal expansion
value: 6.1e-06, temperature range: 243 343; value: 7.8e-06, temperature range: 293 573
dPgF
-0.0083
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 1.78e-06 K⁻¹ at 633 nm, dn/dT = 1.17e-06 K⁻¹ at 1310 nm, dn/dT = 1.12e-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-LAK52 (CDGM), D-LAK52: n and k versus wavelength
λ (µm)nk
0.3021.7919541.694040e-06
0.3035491.7910021.649001e-06
0.3051061.7900621.603730e-06
0.306671.7891361.558228e-06
0.3082431.7882221.512492e-06
0.3098241.7873211.466521e-06
0.311.7872211.461400e-06
0.3114131.7864321.387387e-06
0.313011.7855551.303722e-06
0.3146151.784691.219628e-06
0.3162291.7838371.135103e-06
0.317851.7829951.050144e-06
0.3194811.7821659.647498e-07
0.321.7819039.375400e-07
0.3211191.7813469.041363e-07
0.3227661.7805378.549774e-07
0.3244211.779748.055664e-07
0.3260851.7789537.559020e-07
0.3277571.7781767.059829e-07
0.3294381.777416.558078e-07
0.331.7771576.390400e-07
0.3311281.7766546.144146e-07
0.3328261.7759075.773346e-07
0.3345331.7751715.400643e-07
0.3362491.7744445.026030e-07
0.3379731.7737264.649495e-07
0.3397061.7730184.271029e-07
0.341.7728994.206900e-07
0.3414481.7723193.991335e-07
0.34321.7716293.730733e-07
0.344961.7709483.468794e-07
0.3467291.7702753.205512e-07
0.3485071.7696112.940880e-07
0.351.7690632.718700e-07
0.3502941.7689562.688161e-07
0.3520911.7683082.501793e-07
0.3538971.7676692.314469e-07
0.3557121.7670382.126185e-07
0.3575361.7664151.936935e-07
0.3593691.76581.746715e-07
0.361.7655911.681300e-07
0.3612121.7651931.600938e-07
0.3630651.7645931.478155e-07
0.3649271.7641.354743e-07
0.3667981.7634151.230697e-07
0.368681.7628371.106016e-07
0.371.7624371.018500e-07
0.370571.7622669.970132e-08
0.3724711.7617039.254204e-08
0.3743811.7611468.534604e-08
0.3763011.7605967.811313e-08
0.3782311.7600527.084313e-08
0.381.7595626.417900e-08
0.3801711.7595166.388409e-08
0.382121.7589856.051615e-08
0.384081.7584625.713095e-08
0.386051.7579445.372838e-08
0.388031.7574335.030837e-08
0.391.7569334.690500e-08
0.390021.7569284.688185e-08
0.392021.7564294.454219e-08
0.394031.7559364.219053e-08
0.3960511.7554483.982681e-08
0.3980821.7549673.745097e-08
0.41.754523.520800e-08
0.4001241.7544913.515615e-08
0.4021761.7540213.429819e-08
0.4042391.7535573.343583e-08
0.4063121.7530983.256905e-08
0.4083961.7526443.169782e-08
0.410491.7521963.082213e-08
0.4125951.7517532.994194e-08
0.4147111.7513152.905724e-08
0.4168381.7508822.816801e-08
0.4189761.7504542.727421e-08
0.421.7502522.684600e-08
0.4211251.7500312.632337e-08
0.4232841.7496132.531963e-08
0.4254551.74922.431074e-08
0.4276371.7487922.329668e-08
0.429831.7483882.227741e-08
0.4320351.7479892.125292e-08
0.434251.7475942.022318e-08
0.4364771.7472041.918815e-08
0.4387161.7468191.814782e-08
0.441.74661.755100e-08
0.4409661.7464371.741197e-08
0.4432271.746061.708643e-08
0.44551.7456871.675922e-08
0.4477851.7453191.643033e-08
0.4500821.7449551.609975e-08
0.452391.7445941.576748e-08
0.454711.7442381.543350e-08
0.4570421.7438851.509781e-08
0.4593861.7435371.476040e-08
0.461.7434471.467200e-08
0.4617421.7431921.439365e-08
0.464111.7428521.401524e-08
0.466491.7425151.363488e-08
0.4688831.7421811.325258e-08
0.4712871.7418521.286831e-08
0.4737041.7415251.248207e-08
0.4761341.7412031.209385e-08
0.4785751.7408841.170365e-08
0.481.74071.147600e-08
0.481031.7405681.129525e-08
0.4834971.7402561.086226e-08
0.4859761.7399471.042705e-08
0.4884691.7396429.989608e-09
0.4909741.739349.549922e-09
0.4934921.7390419.107981e-09
0.4960231.7387458.663774e-09
0.4985671.7384528.217288e-09
0.51.7382897.965700e-09
0.5011231.7381637.983599e-09
0.5036931.7378768.024545e-09
0.5062771.7375938.065700e-09
0.5088731.7373128.107067e-09
0.5114831.7370358.148646e-09
0.5141061.736768.190438e-09
0.5167431.7364898.232444e-09
0.5193931.736228.274666e-09
0.5220561.7359548.317104e-09
0.5247341.735698.359760e-09
0.5274251.735438.402635e-09
0.530131.7351728.445729e-09
0.5328491.7349168.489045e-09
0.5355811.7346648.532583e-09
0.5383281.7344138.576344e-09
0.5410891.7341668.620329e-09
0.5438641.7339218.664540e-09
0.5466531.7336788.708978e-09
0.5494571.7334388.753644e-09
0.551.7333928.762300e-09
0.5522751.73328.798538e-09
0.5551071.7329658.843663e-09
0.5579541.7327328.889020e-09
0.5608151.7325018.934609e-09
0.5636911.7322728.980431e-09
0.5665821.7320469.026489e-09
0.5694881.7318229.072783e-09
0.5724091.73169.119315e-09
0.5753441.7313819.166085e-09
0.5782951.7311639.213095e-09
0.5812611.7309489.260346e-09
0.5842421.7307349.307839e-09
0.5872381.7305239.355576e-09
0.590251.7303149.403558e-09
0.5932771.7301069.451786e-09
0.5963191.7299019.500261e-09
0.5993781.7296989.548985e-09
0.61.7296579.558900e-09
0.6024521.7294969.597934e-09
0.6055411.7292979.647128e-09
0.6086471.7290999.696574e-09
0.6117681.7289039.746274e-09
0.6149061.7287099.796228e-09
0.6180591.7285179.846439e-09
0.6212291.7283269.896908e-09
0.6244151.7281379.947635e-09
0.6276171.727959.998622e-09
0.6308361.7277651.004987e-08
0.6340711.7275811.010138e-08
0.6373231.7273991.015316e-08
0.6405921.7272181.020520e-08
0.6438771.7270391.025751e-08
0.6471791.7268621.031008e-08
0.651.7267131.035500e-08
0.6504981.7266861.036294e-08
0.6538341.7265121.041612e-08
0.6571871.7263391.046957e-08
0.6605581.7261681.052329e-08
0.6639451.7259981.057729e-08
0.6673511.725831.063157e-08
0.6707731.7256631.068612e-08
0.6742131.7254981.074096e-08
0.6776711.7253331.079607e-08
0.6811461.7251711.085147e-08
0.684641.7250091.090715e-08
0.6881511.7248491.096312e-08
0.691681.724691.101938e-08
0.6952271.7245331.107592e-08
0.6987931.7243761.113276e-08
0.71.7243241.115200e-08
0.7023761.7242211.118986e-08
0.7059791.7240681.124724e-08
0.7095991.7239151.130492e-08
0.7132381.7237641.136289e-08
0.7168961.7236131.142116e-08
0.7205731.7234641.147973e-08
0.7242681.7233161.153860e-08
0.7279831.7231691.159777e-08
0.7317161.7230241.165724e-08
0.7354691.7228791.171702e-08
0.7392411.7227351.177711e-08
0.7430321.7225931.183750e-08
0.7468431.7224511.189820e-08
0.7506731.7223111.195922e-08
0.7545231.7221711.202055e-08
0.7583921.7220331.208219e-08
0.7622821.7218951.214415e-08
0.7661911.7217591.220642e-08
0.770121.7216231.226902e-08
0.774071.7214881.233194e-08
0.778041.7213541.239517e-08
0.782031.7212211.245874e-08
0.7860411.7210891.252263e-08
0.7900721.7209581.258685e-08
0.7941241.7208271.265139e-08
0.7981961.7206981.271627e-08
0.81.7206411.274500e-08
0.802291.7205691.278150e-08
0.8064051.7204411.284709e-08
0.810541.7203131.291301e-08
0.8146971.7201871.297927e-08
0.8188751.7200611.304587e-08
0.8230751.7199361.311281e-08
0.8272961.7198121.318010e-08
0.8315391.7196881.324773e-08
0.8358031.7195651.331571e-08
0.840091.7194431.338403e-08
0.8443981.7193211.345271e-08
0.8487291.71921.352174e-08
0.851.7191651.354200e-08
0.8530821.719081.359106e-08
0.8574571.718961.366071e-08
0.8618541.7188411.373072e-08
0.8662741.7187231.380108e-08
0.8707171.7186051.387181e-08
0.8751821.7184871.394290e-08
0.8796711.7183711.401436e-08
0.8841821.7182541.408618e-08
0.8887171.7181391.415837e-08
0.8932741.7180231.423093e-08
0.8978561.7179091.430386e-08
0.91.7178551.433800e-08
0.902461.7177941.437722e-08
0.9070881.717681.445099e-08
0.9117411.7175671.452514e-08
0.9164161.7174541.459968e-08
0.9211161.7173421.467459e-08
0.925841.717231.474989e-08
0.9305881.7171181.482558e-08
0.9353611.7170071.490165e-08
0.9401581.7168961.497812e-08
0.944981.7167851.505497e-08
0.9498261.7166751.513222e-08
0.951.7166711.513500e-08
0.9546971.7165651.520978e-08
0.9595931.7164561.528772e-08
0.9645151.7163471.536607e-08
0.9694611.7162381.544482e-08
0.9744331.7161291.552397e-08
0.979431.7160211.560353e-08
0.9844531.7159131.568350e-08
0.9895021.7158051.576387e-08
0.9945771.7156971.584466e-08
0.9996781.715591.592587e-08
11.7155831.593100e-08
1.00481.7154831.600755e-08
1.009961.7153761.608966e-08
1.015141.7152691.617219e-08
1.020341.7151631.625514e-08
1.025581.7150571.633851e-08
1.030841.714951.642232e-08
1.036121.7148441.650655e-08
1.041441.7147381.659122e-08
1.046781.7146331.667632e-08
1.052151.7145271.676185e-08
1.057541.7144211.684783e-08
1.061.7143731.688700e-08
1.062971.7143161.693425e-08
1.068421.714211.702113e-08
1.07391.7141051.710844e-08
1.07941.7141.719621e-08
1.084941.7138951.728443e-08
1.09051.7137891.737309e-08
1.09611.7136841.746222e-08
1.101721.7135791.755180e-08
1.107371.7134741.764184e-08
1.113051.7133681.773234e-08
1.118761.7132631.782330e-08
1.124491.7131581.791474e-08
1.130261.7130521.800664e-08
1.136061.7129471.809901e-08
1.141881.7128411.819185e-08
1.147741.7127361.828518e-08
1.153621.712631.837898e-08
1.159541.7125241.847326e-08
1.165491.7124181.856802e-08
1.171471.7123121.866328e-08
1.177471.7122061.875902e-08
1.183511.7120991.885525e-08
1.189581.7119931.895197e-08
1.195681.7118861.904919e-08
1.21.711811.911800e-08
1.201811.7117791.924821e-08
1.207981.7116721.969060e-08
1.214171.7115642.013526e-08
1.22041.7114562.058219e-08
1.226661.7113492.103142e-08
1.232951.711242.148295e-08
1.239271.7111322.193680e-08
1.245631.7110232.239298e-08
1.252021.7109142.285149e-08
1.258441.7108052.331236e-08
1.264891.7106952.377559e-08
1.271381.7105852.424119e-08
1.27791.7104742.470919e-08
1.284451.7103642.517958e-08
1.291041.7102532.565238e-08
1.297661.7101412.612762e-08
1.304321.7100292.660528e-08
1.311011.7099172.708540e-08
1.317731.7098042.756798e-08
1.324491.7096912.805304e-08
1.331281.7095772.854058e-08
1.338111.7094632.903062e-08
1.344971.7093482.952318e-08
1.351871.7092333.001826e-08
1.35881.7091183.051588e-08
1.365771.7090023.101605e-08
1.372771.7088853.151879e-08
1.379811.7087683.202411e-08
1.386891.708653.253202e-08
1.3941.7085313.304253e-08
1.41.7084323.347300e-08
1.401151.7084133.357411e-08
1.408341.7082933.420499e-08
1.415561.7081733.483911e-08
1.422821.7080523.547647e-08
1.430121.7079313.611711e-08
1.437451.7078083.676103e-08
1.444821.7076863.740825e-08
1.452231.7075623.805880e-08
1.459681.7074383.871268e-08
1.467171.7073133.936991e-08
1.474691.7071874.003051e-08
1.482251.7070614.069451e-08
1.489861.7069344.136190e-08
1.49751.7068064.203272e-08
1.505181.7066774.270698e-08
1.51291.7065484.338470e-08
1.520651.7064174.406589e-08
1.528451.7062864.475058e-08
1.536291.7061544.543878e-08
1.544171.7060214.613051e-08
1.552091.7058874.682578e-08
1.560051.7057524.752462e-08
1.568051.7056174.822705e-08
1.576091.705484.893308e-08
1.584181.7053434.964272e-08
1.59231.7052045.035601e-08
1.61.7050735.103200e-08
1.600471.7050655.131634e-08
1.608671.7049245.631904e-08
1.616921.7047826.134740e-08
1.625221.704646.640155e-08
1.633551.7044967.148162e-08
1.641931.7043517.658774e-08
1.650351.7042068.172005e-08
1.658811.7040598.687868e-08
1.667321.7039119.206377e-08
1.675871.7037619.727545e-08
1.684471.7036111.025139e-07
1.693111.7034591.077791e-07
1.701791.7033071.130714e-07
1.710521.7031531.183908e-07
1.719291.7029971.237375e-07
1.728111.7028411.291116e-07
1.736971.7026831.345133e-07
1.745881.7025241.399427e-07
1.754831.7023631.453999e-07
1.763831.7022021.508851e-07
1.772881.7020381.563985e-07
1.781971.7018741.619401e-07
1.791111.7017081.675101e-07
1.81.7015461.729300e-07
1.800291.701541.735321e-07
1.809531.7013721.924871e-07
1.818811.7012012.115393e-07
1.828131.7010292.306892e-07
1.837511.7008562.499373e-07
1.846931.7006812.692842e-07
1.856411.7005052.887303e-07
1.865931.7003273.082761e-07
1.87551.7001473.279221e-07
1.885111.6999663.476689e-07
1.894781.6997833.675170e-07
1.90451.6995983.874668e-07
1.914271.6994124.075190e-07
1.924081.6992244.276740e-07
1.933951.6990344.479324e-07
1.943871.6988424.682946e-07
1.953841.6986494.887613e-07
1.963861.6984545.093330e-07
1.973931.6982565.300102e-07
1.984051.6980575.507934e-07
1.994231.6978565.716832e-07
21.6977425.835300e-07
2.004461.6976546.120649e-07
2.014741.6974496.778803e-07
2.025071.6972427.440333e-07
2.035461.6970338.105255e-07
2.045891.6968228.773588e-07
2.056391.6966099.445348e-07
2.066931.6963941.012055e-06
2.077531.6961761.079922e-06
2.088191.6959571.148137e-06
2.09891.6957351.216702e-06
2.109661.6955111.285618e-06
2.120481.6952851.354888e-06
2.131361.6950571.424513e-06
2.142291.6948261.494495e-06
2.153271.6945921.564836e-06
2.164321.6943571.635538e-06
2.175421.6941191.706602e-06
2.186571.6938781.778031e-06
2.197791.6936351.849826e-06
2.21.6935871.864000e-06
2.209061.6933892.154845e-06
2.220391.6931412.518636e-06
2.231771.6928912.884293e-06
2.243221.6926373.251826e-06
2.254721.6923813.621243e-06
2.266291.6921223.992555e-06
2.277911.691864.365771e-06
2.289591.6915964.740902e-06
2.301331.6913295.117956e-06
2.313141.6910595.496944e-06
2.3251.6907855.877875e-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
—