Optical constants

Refractive index of D-LAF050-25 (CDGM)

D-LAF050-25: 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
1.76709
Extinction coefficient k
1.87414e-08
Permittivity ε1
3.1226
Permittivity ε2
6.62355e-08
Absorption coefficient α
0.00400803 cm⁻¹
Penetration depth δ = λ/(2πk)
4.98998e+09 nm
Abbe number Vd
49.197
Chromatic dispersion dn/dλ
-0.080191 µm⁻¹
Group index ng
1.81421
Group velocity dispersion
144.296 fs²/mm
Dispersion parameter D
-787.211 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-LAF050-25 (CDGM): D-LAF050-25
cdgm_d_laf050_25 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-LAF050-25", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_laf050_25.range_nm)  # (302, 2325) nm
eps = cdgm_d_laf050_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=1.22950343λ2λ2−87.307119+0.641767823λ2λ2−0.023765216+1.41136391λ2λ2−0.006459327

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C21.22950343
C387.307119
C40.641767823
C50.023765216
C61.41136391
C70.006459327

Comments and conditions

anneal rate:25°C/h

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 4.01e-06 1.55e-08 -3.41e-11 5.74e-07 4.46e-10 0.215
nd
1.767090
Vd
49.197491
glass code
767492
density
value: 4510
thermal expansion
value: 5.7e-06, temperature range: 243 343; value: 7.4e-06, temperature range: 293 573
dPgF
-0.0095
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 3.37e-06 K⁻¹ at 633 nm, dn/dT = 2.55e-06 K⁻¹ at 1310 nm, dn/dT = 2.48e-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-LAF050-25 (CDGM), D-LAF050-25: n and k versus wavelength
λ (µm)nk
0.3021.8399944.225100e-06
0.3035491.8388274.109017e-06
0.3051061.8376783.992338e-06
0.306671.8365463.875061e-06
0.3082431.835433.757182e-06
0.3098241.8343313.638699e-06
0.311.834213.625500e-06
0.3114131.8332483.425386e-06
0.313011.8321813.199175e-06
0.3146151.831132.971804e-06
0.3162291.8300942.743266e-06
0.317851.8290722.513557e-06
0.3194811.8280662.282669e-06
0.321.8277492.209100e-06
0.3211191.8270742.132277e-06
0.3227661.8260952.019220e-06
0.3244211.8251311.905583e-06
0.3260851.8241811.791363e-06
0.3277571.8232441.676558e-06
0.3294381.8223191.561163e-06
0.331.8220151.522600e-06
0.3311281.8214081.464113e-06
0.3328261.820511.376044e-06
0.3345331.8196241.287524e-06
0.3362491.818751.198550e-06
0.3379731.8178881.109120e-06
0.3397061.8170381.019231e-06
0.341.8168951.004000e-06
0.3414481.8161999.536707e-07
0.34321.8153728.928261e-07
0.344961.8145568.316695e-07
0.3467291.8137527.701993e-07
0.3485071.8129577.084138e-07
0.351.8123026.565400e-07
0.3502941.8121746.499323e-07
0.3520911.8114016.096083e-07
0.3538971.8106385.690775e-07
0.3557121.8098865.283388e-07
0.3575361.8091434.873912e-07
0.3593691.808414.462336e-07
0.361.8081614.320800e-07
0.3612121.8076874.129679e-07
0.3630651.8069733.837672e-07
0.3649271.8062683.544167e-07
0.3667981.8055733.249157e-07
0.368681.8048862.952634e-07
0.371.8044122.744500e-07
0.370571.8042082.691015e-07
0.3724711.8035392.512808e-07
0.3743811.8028792.333686e-07
0.3763011.8022272.153646e-07
0.3782311.8015841.972682e-07
0.381.8010041.806800e-07
0.3801711.8009481.798136e-07
0.382121.8003211.699188e-07
0.384081.7997011.599732e-07
0.386051.7990891.499767e-07
0.388031.7984851.399289e-07
0.391.7978951.299300e-07
0.390021.7978891.298712e-07
0.392021.79731.239326e-07
0.394031.7967181.179635e-07
0.3960511.7961431.119637e-07
0.3980821.7955761.059332e-07
0.41.7950491.002400e-07
0.4001241.7950151.000583e-07
0.4021761.7944629.705154e-08
0.4042391.7939159.402936e-08
0.4063121.7933759.099169e-08
0.4083961.7928418.793844e-08
0.410491.7923148.486952e-08
0.4125951.7917938.178487e-08
0.4147111.7912797.868440e-08
0.4168381.7907717.556803e-08
0.4189761.7902687.243568e-08
0.421.7900317.093500e-08
0.4211251.7897727.012201e-08
0.4232841.7892826.856062e-08
0.4254551.7887986.699123e-08
0.4276371.7883196.541379e-08
0.429831.7878466.382825e-08
0.4320351.7873796.223459e-08
0.434251.7869176.063275e-08
0.4364771.786465.902270e-08
0.4387161.7860095.740439e-08
0.441.7857545.647600e-08
0.4409661.7855645.606182e-08
0.4432271.7851235.509198e-08
0.44551.7846875.411716e-08
0.4477851.7842575.313734e-08
0.4500821.7838315.215250e-08
0.452391.7834115.116260e-08
0.454711.7829955.016763e-08
0.4570421.7825844.916756e-08
0.4593861.7821784.816236e-08
0.461.7820724.789900e-08
0.4617421.7817764.707075e-08
0.464111.7813794.594474e-08
0.466491.7809874.481296e-08
0.4688831.7805984.367537e-08
0.4712871.7802154.253195e-08
0.4737041.7798354.138266e-08
0.4761341.779464.022748e-08
0.4785751.7790893.906638e-08
0.481.7788753.838900e-08
0.481031.7787223.785149e-08
0.4834971.778363.656385e-08
0.4859761.7780013.526961e-08
0.4884691.7776463.396874e-08
0.4909741.7772953.266119e-08
0.4934921.7769483.134694e-08
0.4960231.7766053.002595e-08
0.4985671.7762662.869818e-08
0.51.7760772.795000e-08
0.5011231.775932.771614e-08
0.5036931.7755982.718116e-08
0.5062771.775272.664344e-08
0.5088731.7749452.610297e-08
0.5114831.7746242.555972e-08
0.5141061.7743062.501368e-08
0.5167431.7739912.446485e-08
0.5193931.773682.391320e-08
0.5220561.7733722.335872e-08
0.5247341.7730682.280140e-08
0.5274251.7727672.224122e-08
0.530131.7724692.167816e-08
0.5328491.7721742.111222e-08
0.5355811.7718822.054338e-08
0.5383281.7715931.997162e-08
0.5410891.7713081.939693e-08
0.5438641.7710251.881928e-08
0.5466531.7707451.823868e-08
0.5494571.7704681.765510e-08
0.551.7704151.754200e-08
0.5522751.7701941.761456e-08
0.5551071.7699231.770491e-08
0.5579541.7696551.779573e-08
0.5608151.7693891.788701e-08
0.5636911.7691261.797876e-08
0.5665821.7688661.807098e-08
0.5694881.7686081.816367e-08
0.5724091.7683531.825684e-08
0.5753441.7681011.835048e-08
0.5782951.7678511.844461e-08
0.5812611.7676031.853922e-08
0.5842421.7673581.863431e-08
0.5872381.7671161.872989e-08
0.590251.7668761.882596e-08
0.5932771.7666381.892253e-08
0.5963191.7664021.901959e-08
0.5993781.7661691.911715e-08
0.61.7661221.913700e-08
0.6024521.7659381.921520e-08
0.6055411.765711.931377e-08
0.6086471.7654831.941283e-08
0.6117681.7652591.951241e-08
0.6149061.7650371.961249e-08
0.6180591.7648171.971309e-08
0.6212291.7645991.981420e-08
0.6244151.7643831.991584e-08
0.6276171.764172.001799e-08
0.6308361.7639582.012067e-08
0.6340711.7637482.022387e-08
0.6373231.763542.032761e-08
0.6405921.7633342.043187e-08
0.6438771.763132.053667e-08
0.6471791.7629282.064201e-08
0.651.7627582.073200e-08
0.6504981.7627282.069219e-08
0.6538341.762532.042557e-08
0.6571871.7623332.015758e-08
0.6605581.7621381.988822e-08
0.6639451.7619451.961748e-08
0.6673511.7617541.934534e-08
0.6707731.7615641.907182e-08
0.6742131.7613761.879689e-08
0.6776711.7611891.852055e-08
0.6811461.7610051.824279e-08
0.684641.7608221.796361e-08
0.6881511.760641.768299e-08
0.691681.760461.740094e-08
0.6952271.7602811.711744e-08
0.6987931.7601041.683249e-08
0.71.7600451.673600e-08
0.7023761.7599291.679282e-08
0.7059791.7597551.687895e-08
0.7095991.7595821.696552e-08
0.7132381.7594111.705253e-08
0.7168961.7592411.713999e-08
0.7205731.7590731.722790e-08
0.7242681.7589061.731626e-08
0.7279831.758741.740507e-08
0.7317161.7585761.749434e-08
0.7354691.7584131.758406e-08
0.7392411.7582511.767425e-08
0.7430321.7580911.776489e-08
0.7468431.7579311.785601e-08
0.7506731.7577731.794759e-08
0.7545231.7576171.803964e-08
0.7583921.7574611.813216e-08
0.7622821.7573061.822515e-08
0.7661911.7571531.831863e-08
0.770121.7570011.841258e-08
0.774071.756851.850701e-08
0.778041.75671.860193e-08
0.782031.7565511.869734e-08
0.7860411.7564031.879323e-08
0.7900721.7562561.888962e-08
0.7941241.756111.898650e-08
0.7981961.7559661.908388e-08
0.81.7559021.912700e-08
0.802291.7558221.887120e-08
0.8064051.7556791.841161e-08
0.810541.7555371.794965e-08
0.8146971.7553961.748533e-08
0.8188751.7552561.701863e-08
0.8230751.7551171.654953e-08
0.8272961.7549791.607803e-08
0.8315391.7548411.560411e-08
0.8358031.7547051.512776e-08
0.840091.7545691.464896e-08
0.8443981.7544341.416771e-08
0.8487291.75431.368399e-08
0.851.7542611.354200e-08
0.8530821.7541671.359106e-08
0.8574571.7540341.366071e-08
0.8618541.7539031.373072e-08
0.8662741.7537721.380108e-08
0.8707171.7536411.387181e-08
0.8751821.7535121.394290e-08
0.8796711.7533831.401436e-08
0.8841821.7532551.408618e-08
0.8887171.7531271.415837e-08
0.8932741.7531.423093e-08
0.8978561.7528741.430386e-08
0.91.7528151.433800e-08
0.902461.7527481.437722e-08
0.9070881.7526231.445099e-08
0.9117411.7524991.452514e-08
0.9164161.7523751.459968e-08
0.9211161.7522521.467459e-08
0.925841.7521291.474989e-08
0.9305881.7520071.482558e-08
0.9353611.7518861.490165e-08
0.9401581.7517641.497812e-08
0.944981.7516441.505497e-08
0.9498261.7515241.513222e-08
0.951.7515191.513500e-08
0.9546971.7514041.520978e-08
0.9595931.7512851.528772e-08
0.9645151.7511661.536607e-08
0.9694611.7510481.544482e-08
0.9744331.750931.552397e-08
0.979431.7508121.560353e-08
0.9844531.7506951.568350e-08
0.9895021.7505781.576387e-08
0.9945771.7504621.584466e-08
0.9996781.7503461.592587e-08
11.7503381.593100e-08
1.00481.750231.600755e-08
1.009961.7501151.608966e-08
1.015141.751.617219e-08
1.020341.7498851.625514e-08
1.025581.749771.633851e-08
1.030841.7496561.642232e-08
1.036121.7495421.650655e-08
1.041441.7494281.659122e-08
1.046781.7493151.667632e-08
1.052151.7492011.676185e-08
1.057541.7490881.684783e-08
1.061.7490371.688700e-08
1.062971.7489751.693425e-08
1.068421.7488631.702113e-08
1.07391.748751.710844e-08
1.07941.7486381.719621e-08
1.084941.7485251.728443e-08
1.09051.7484131.737309e-08
1.09611.7483011.746222e-08
1.101721.7481891.755180e-08
1.107371.7480771.764184e-08
1.113051.7479651.773234e-08
1.118761.7478541.782330e-08
1.124491.7477421.791474e-08
1.130261.747631.800664e-08
1.136061.7475191.809901e-08
1.141881.7474071.819185e-08
1.147741.7472961.828518e-08
1.153621.7471841.837898e-08
1.159541.7470721.847326e-08
1.165491.7469611.856802e-08
1.171471.7468491.866328e-08
1.177471.7467371.875902e-08
1.183511.7466251.885525e-08
1.189581.7465131.895197e-08
1.195681.7464011.904919e-08
1.21.7463221.911800e-08
1.201811.7462891.914690e-08
1.207981.7461771.924509e-08
1.214171.7460641.934377e-08
1.22041.7459521.944297e-08
1.226661.7458391.954267e-08
1.232951.7457261.964289e-08
1.239271.7456131.974361e-08
1.245631.74551.984486e-08
1.252021.7453861.994662e-08
1.258441.7452722.004891e-08
1.264891.7451582.015172e-08
1.271381.7450442.025506e-08
1.27791.7449292.035893e-08
1.284451.7448152.046333e-08
1.291041.7446992.056826e-08
1.297661.7445842.067374e-08
1.304321.7444682.077975e-08
1.311011.7443522.088631e-08
1.317731.7442362.099342e-08
1.324491.7441192.110107e-08
1.331281.7440022.120928e-08
1.338111.7438842.131804e-08
1.344971.7437662.142736e-08
1.351871.7436472.153724e-08
1.35881.7435292.164769e-08
1.365771.7434092.175870e-08
1.372771.743292.187028e-08
1.379811.7431692.198243e-08
1.386891.7430492.209515e-08
1.3941.7429272.220846e-08
1.41.7428252.230400e-08
1.401151.7428062.232235e-08
1.408341.7426832.243682e-08
1.415561.7425612.255187e-08
1.422821.7424372.266752e-08
1.430121.7423132.278376e-08
1.437451.7421892.290060e-08
1.444821.7420632.301803e-08
1.452231.7419382.313607e-08
1.459681.7418112.325472e-08
1.467171.7416842.337397e-08
1.474691.7415572.349383e-08
1.482251.7414282.361431e-08
1.489861.7412992.373541e-08
1.49751.7411692.385712e-08
1.505181.7410392.397946e-08
1.51291.7409072.410243e-08
1.520651.7407752.422603e-08
1.528451.7406432.435027e-08
1.536291.7405092.447514e-08
1.544171.7403752.460065e-08
1.552091.7402392.472680e-08
1.560051.7401032.485360e-08
1.568051.7399672.498105e-08
1.576091.7398292.510916e-08
1.584181.739692.523792e-08
1.59231.7395512.536735e-08
1.61.7394182.549000e-08
1.600471.739412.573261e-08
1.608671.7392693.000119e-08
1.616921.7391263.429166e-08
1.625221.7389833.860414e-08
1.633551.7388394.293873e-08
1.641931.7386934.729555e-08
1.650351.7385475.167472e-08
1.658811.7383995.607634e-08
1.667321.7382516.050054e-08
1.675871.7381016.494742e-08
1.684471.7379516.941712e-08
1.693111.7377997.390973e-08
1.701791.7376467.842539e-08
1.710521.7374928.296420e-08
1.719291.7373368.752630e-08
1.728111.737189.211179e-08
1.736971.7370229.672079e-08
1.745881.7368631.013534e-07
1.754831.7367031.060098e-07
1.763831.7365421.106901e-07
1.772881.7363791.153944e-07
1.781971.7362151.201228e-07
1.791111.736051.248755e-07
1.81.7358881.295000e-07
1.800291.7358831.301174e-07
1.809531.7357151.495543e-07
1.818811.7355451.690910e-07
1.828131.7353741.887278e-07
1.837511.7352022.084653e-07
1.846931.7350282.283041e-07
1.856411.7348522.482446e-07
1.865931.7346752.682874e-07
1.87551.7344972.884330e-07
1.885111.7343173.086818e-07
1.894781.7341353.290346e-07
1.90451.7339523.494917e-07
1.914271.7337673.700537e-07
1.924081.7335813.907212e-07
1.933951.7333924.114946e-07
1.943871.7332024.323746e-07
1.953841.7330114.533617e-07
1.963861.7328174.744565e-07
1.973931.7326224.956594e-07
1.984051.7324255.169710e-07
1.994231.7322265.383919e-07
21.7321135.505400e-07
2.004461.7320255.746378e-07
2.014741.7318236.302191e-07
2.025071.7316186.860854e-07
2.035461.7314127.422383e-07
2.045891.7312037.986791e-07
2.056391.7309938.554094e-07
2.066931.730789.124307e-07
2.077531.7305669.697443e-07
2.088191.7303491.027352e-06
2.09891.730131.085255e-06
2.109661.7299091.143455e-06
2.120481.7296861.201953e-06
2.131361.729461.260752e-06
2.142291.7292331.319852e-06
2.153271.7290031.379255e-06
2.164321.728771.438963e-06
2.175421.7285361.498977e-06
2.186571.7282991.559299e-06
2.197791.7280591.619930e-06
2.21.7280121.631900e-06
2.209061.7278171.891564e-06
2.220391.7275732.216355e-06
2.231771.7273262.542812e-06
2.243221.7270772.870942e-06
2.254721.7268243.200756e-06
2.266291.726573.532261e-06
2.277911.7263123.865466e-06
2.289591.7260524.200380e-06
2.301331.7257894.537011e-06
2.313141.7255244.875369e-06
2.3251.7252555.215463e-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
—