Optical constants

Refractive index of D-FK95 (CDGM)

D-FK95: 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
1.4378
Extinction coefficient k
9.36134e-09
Permittivity ε1
2.06727
Permittivity ε2
2.69195e-08
Absorption coefficient α
0.00200201 cm⁻¹
Penetration depth δ = λ/(2πk)
9.98996e+09 nm
Abbe number Vd
94.523
Chromatic dispersion dn/dλ
-0.0240376 µm⁻¹
Group index ng
1.45192
Group velocity dispersion
40.9356 fs²/mm
Dispersion parameter D
-223.326 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-FK95 (CDGM): D-FK95
cdgm_d_fk95 = ls.fetch_refractiveindex("specs", "CDGM-optical", "D-FK95", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(cdgm_d_fk95.range_nm)  # (302, 2325) nm
eps = cdgm_d_fk95.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=0.973027043λ2λ2−0.004919458+0.077363216λ2λ2−0.01820094+0.687944956λ2λ2−159.44609

Valid from 0.302 to 2.325 µm.

Coefficients as stored
CiValue
C10.0
C20.973027043
C30.004919458
C40.077363216
C50.01820094
C60.687944956
C7159.44609

Comments and conditions

anneal rate:4°C/h

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -2.24e-05 -5.6e-09 -9.96e-12 3.32e-07 4.01e-12 0.182
nd
1.437800
Vd
94.523389
glass code
438945
density
value: 3520
thermal expansion
value: 1.43e-05, temperature range: 243 343; value: 1.69e-05, temperature range: 293 573
dPgF
0.0487
resistance
climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = -7.96e-06 K⁻¹ at 633 nm, dn/dT = -8.12e-06 K⁻¹ at 1310 nm, dn/dT = -8.12e-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-FK95 (CDGM), D-FK95: n and k versus wavelength
λ (µm)nk
0.3021.4576561.241636e-06
0.3035491.4573661.150904e-06
0.3051061.457081.059706e-06
0.306671.4567979.680402e-07
0.3082431.4565178.759046e-07
0.3098241.4562417.832964e-07
0.311.456217.729800e-07
0.3114131.4559687.197105e-07
0.313011.4556986.594940e-07
0.3146151.4554325.989687e-07
0.3162291.4551695.381329e-07
0.317851.4549094.769852e-07
0.3194811.4546524.155239e-07
0.321.4545713.959400e-07
0.3211191.4543983.742248e-07
0.3227661.4541473.422674e-07
0.3244211.4538993.101461e-07
0.3260851.4536542.778601e-07
0.3277571.4534122.454085e-07
0.3294381.4531722.127905e-07
0.331.4530932.018900e-07
0.3311281.4529361.912594e-07
0.3328261.4527021.752522e-07
0.3345331.4524711.591630e-07
0.3362491.4522431.429912e-07
0.3379731.4520171.267365e-07
0.3397061.4517941.103984e-07
0.341.4517561.076300e-07
0.3414481.4515739.895730e-08
0.34321.4513558.847262e-08
0.344961.451147.793417e-08
0.3467291.4509276.734167e-08
0.3485071.4507165.669485e-08
0.351.4505424.775600e-08
0.3502941.4505084.736827e-08
0.3520911.4503024.500212e-08
0.3538971.4500994.262382e-08
0.3557121.4498984.023333e-08
0.3575361.4496993.783059e-08
0.3593691.4495023.541551e-08
0.361.4494353.458500e-08
0.3612121.4493083.254005e-08
0.3630651.4491162.941565e-08
0.3649271.4489262.627523e-08
0.3667981.4487382.311870e-08
0.368681.4485521.994598e-08
0.371.4484231.771900e-08
0.370571.4483681.757293e-08
0.3724711.4481871.708621e-08
0.3743811.4480071.659701e-08
0.3763011.4478291.610529e-08
0.3782311.4476541.561105e-08
0.381.4474951.515800e-08
0.3801711.447481.511158e-08
0.382121.4473081.458145e-08
0.384081.4471391.404861e-08
0.386051.4469711.351303e-08
0.388031.4468041.297470e-08
0.391.4466421.243900e-08
0.390021.446641.243963e-08
0.392021.4464781.250344e-08
0.394031.4463171.256757e-08
0.3960511.4461581.263204e-08
0.3980821.4460011.269683e-08
0.41.4458551.275800e-08
0.4001241.4458451.276196e-08
0.4021761.4456911.282742e-08
0.4042391.4455391.289321e-08
0.4063121.4453891.295935e-08
0.4083961.445241.302582e-08
0.410491.4450931.309263e-08
0.4125951.4449471.315979e-08
0.4147111.4448031.322729e-08
0.4168381.444661.329513e-08
0.4189761.4445191.336333e-08
0.421.4444531.339600e-08
0.4211251.444381.343187e-08
0.4232841.4442421.350077e-08
0.4254551.4441051.357002e-08
0.4276371.443971.363962e-08
0.429831.4438371.370958e-08
0.4320351.4437041.377990e-08
0.434251.4435741.385058e-08
0.4364771.4434441.392163e-08
0.4387161.4433161.399304e-08
0.441.4432431.403400e-08
0.4409661.4431891.388739e-08
0.4432271.4430641.354410e-08
0.44551.442941.319904e-08
0.4477851.4428171.285221e-08
0.4500821.4426951.250361e-08
0.452391.4425751.215322e-08
0.454711.4424561.180103e-08
0.4570421.4423381.144703e-08
0.4593861.4422221.109122e-08
0.461.4421921.099800e-08
0.4617421.4421071.103963e-08
0.464111.4419931.109623e-08
0.466491.441881.115311e-08
0.4688831.4417681.121029e-08
0.4712871.4416571.126776e-08
0.4737041.4415481.132553e-08
0.4761341.4414391.138359e-08
0.4785751.4413321.144195e-08
0.481.441271.147600e-08
0.481031.4412261.129525e-08
0.4834971.4411211.086226e-08
0.4859761.4410171.042705e-08
0.4884691.4409149.989608e-09
0.4909741.4408129.549922e-09
0.4934921.4407119.107981e-09
0.4960231.4406118.663774e-09
0.4985671.4405128.217288e-09
0.51.4404577.965700e-09
0.5011231.4404147.983599e-09
0.5036931.4403178.024545e-09
0.5062771.4402218.065700e-09
0.5088731.4401268.107067e-09
0.5114831.4400328.148646e-09
0.5141061.4399398.190438e-09
0.5167431.4398478.232444e-09
0.5193931.4397558.274666e-09
0.5220561.4396658.317104e-09
0.5247341.4395758.359760e-09
0.5274251.4394878.402635e-09
0.530131.4393998.445729e-09
0.5328491.4393128.489045e-09
0.5355811.4392268.532583e-09
0.5383281.439148.576344e-09
0.5410891.4390568.620329e-09
0.5438641.4389728.664540e-09
0.5466531.4388898.708978e-09
0.5494571.4388078.753644e-09
0.551.4387928.762300e-09
0.5522751.4387268.798538e-09
0.5551071.4386458.843663e-09
0.5579541.4385668.889020e-09
0.5608151.4384878.934609e-09
0.5636911.4384088.980431e-09
0.5665821.4383319.026489e-09
0.5694881.4382549.072783e-09
0.5724091.4381789.119315e-09
0.5753441.4381039.166085e-09
0.5782951.4380289.213095e-09
0.5812611.4379549.260346e-09
0.5842421.4378819.307839e-09
0.5872381.4378089.355576e-09
0.590251.4377369.403558e-09
0.5932771.4376659.451786e-09
0.5963191.4375949.500261e-09
0.5993781.4375249.548985e-09
0.61.437519.558900e-09
0.6024521.4374549.597934e-09
0.6055411.4373859.647128e-09
0.6086471.4373179.696574e-09
0.6117681.437259.746274e-09
0.6149061.4371839.796228e-09
0.6180591.4371169.846439e-09
0.6212291.437059.896908e-09
0.6244151.4369859.947635e-09
0.6276171.436929.998622e-09
0.6308361.4368561.004987e-08
0.6340711.4367931.010138e-08
0.6373231.436731.015316e-08
0.6405921.4366671.020520e-08
0.6438771.4366051.025751e-08
0.6471791.4365441.031008e-08
0.651.4364921.035500e-08
0.6504981.4364831.036294e-08
0.6538341.4364221.041612e-08
0.6571871.4363621.046957e-08
0.6605581.4363031.052329e-08
0.6639451.4362441.057729e-08
0.6673511.4361851.063157e-08
0.6707731.4361271.068612e-08
0.6742131.436071.074096e-08
0.6776711.4360131.079607e-08
0.6811461.4359561.085147e-08
0.684641.43591.090715e-08
0.6881511.4358441.096312e-08
0.691681.4357891.101938e-08
0.6952271.4357341.107592e-08
0.6987931.4356791.113276e-08
0.71.4356611.115200e-08
0.7023761.4356251.118986e-08
0.7059791.4355711.124724e-08
0.7095991.4355181.130492e-08
0.7132381.4354651.136289e-08
0.7168961.4354131.142116e-08
0.7205731.4353611.147973e-08
0.7242681.4353091.153860e-08
0.7279831.4352581.159777e-08
0.7317161.4352071.165724e-08
0.7354691.4351561.171702e-08
0.7392411.4351061.177711e-08
0.7430321.4350561.183750e-08
0.7468431.4350061.189820e-08
0.7506731.4349571.195922e-08
0.7545231.4349081.202055e-08
0.7583921.434861.208219e-08
0.7622821.4348111.214415e-08
0.7661911.4347631.220642e-08
0.770121.4347161.226902e-08
0.774071.4346691.233194e-08
0.778041.4346221.239517e-08
0.782031.4345751.245874e-08
0.7860411.4345281.252263e-08
0.7900721.4344821.258685e-08
0.7941241.4344361.265139e-08
0.7981961.4343911.271627e-08
0.81.4343711.274500e-08
0.802291.4343461.278150e-08
0.8064051.43431.284709e-08
0.810541.4342561.291301e-08
0.8146971.4342111.297927e-08
0.8188751.4341671.304587e-08
0.8230751.4341231.311281e-08
0.8272961.4340791.318010e-08
0.8315391.4340351.324773e-08
0.8358031.4339921.331571e-08
0.840091.4339491.338403e-08
0.8443981.4339061.345271e-08
0.8487291.4338631.352174e-08
0.851.4338511.354200e-08
0.8530821.4338211.359106e-08
0.8574571.4337791.366071e-08
0.8618541.4337371.373072e-08
0.8662741.4336951.380108e-08
0.8707171.4336531.387181e-08
0.8751821.4336121.394290e-08
0.8796711.433571.401436e-08
0.8841821.4335291.408618e-08
0.8887171.4334881.415837e-08
0.8932741.4334481.423093e-08
0.8978561.4334071.430386e-08
0.91.4333881.433800e-08
0.902461.4333671.437722e-08
0.9070881.4333261.445099e-08
0.9117411.4332861.452514e-08
0.9164161.4332461.459968e-08
0.9211161.4332061.467459e-08
0.925841.4331671.474989e-08
0.9305881.4331271.482558e-08
0.9353611.4330881.490165e-08
0.9401581.4330481.497812e-08
0.944981.4330091.505497e-08
0.9498261.432971.513222e-08
0.951.4329691.513500e-08
0.9546971.4329311.520978e-08
0.9595931.4328921.528772e-08
0.9645151.4328541.536607e-08
0.9694611.4328151.544482e-08
0.9744331.4327761.552397e-08
0.979431.4327381.560353e-08
0.9844531.43271.568350e-08
0.9895021.4326611.576387e-08
0.9945771.4326231.584466e-08
0.9996781.4325851.592587e-08
11.4325831.593100e-08
1.00481.4325471.600755e-08
1.009961.4325091.608966e-08
1.015141.4324711.617219e-08
1.020341.4324331.625514e-08
1.025581.4323951.633851e-08
1.030841.4323581.642232e-08
1.036121.432321.650655e-08
1.041441.4322821.659122e-08
1.046781.4322451.667632e-08
1.052151.4322071.676185e-08
1.057541.432171.684783e-08
1.061.4321521.688700e-08
1.062971.4321321.693425e-08
1.068421.4320941.702113e-08
1.07391.4320571.710844e-08
1.07941.4320191.719621e-08
1.084941.4319821.728443e-08
1.09051.4319451.737309e-08
1.09611.4319071.746222e-08
1.101721.431871.755180e-08
1.107371.4318321.764184e-08
1.113051.4317951.773234e-08
1.118761.4317571.782330e-08
1.124491.431721.791474e-08
1.130261.4316821.800664e-08
1.136061.4316451.809901e-08
1.141881.4316071.819185e-08
1.147741.4315691.828518e-08
1.153621.4315321.837898e-08
1.159541.4314941.847326e-08
1.165491.4314561.856802e-08
1.171471.4314181.866328e-08
1.177471.431381.875902e-08
1.183511.4313421.885525e-08
1.189581.4313041.895197e-08
1.195681.4312661.904919e-08
1.21.431241.911800e-08
1.201811.4312281.904569e-08
1.207981.431191.880001e-08
1.214171.4311521.855307e-08
1.22041.4311131.830487e-08
1.226661.4310751.805539e-08
1.232951.4310361.780463e-08
1.239271.4309981.755259e-08
1.245631.4309591.729925e-08
1.252021.430921.704462e-08
1.258441.4308811.678868e-08
1.264891.4308421.653143e-08
1.271381.4308031.627285e-08
1.27791.4307631.601295e-08
1.284451.4307241.575172e-08
1.291041.4306841.548915e-08
1.297661.4306441.522523e-08
1.304321.4306051.495996e-08
1.311011.4305651.469333e-08
1.317731.4305241.442533e-08
1.324491.4304841.415596e-08
1.331281.4304441.388520e-08
1.338111.4304031.361306e-08
1.344971.4303621.333952e-08
1.351871.4303211.306458e-08
1.35881.430281.278823e-08
1.365771.4302381.251046e-08
1.372771.4301971.223126e-08
1.379811.4301551.195064e-08
1.386891.4301131.166857e-08
1.3941.4300711.138506e-08
1.41.4300361.114600e-08
1.401151.4300291.115517e-08
1.408341.4299861.121241e-08
1.415561.4299441.126994e-08
1.422821.4299011.132776e-08
1.430121.4298571.138588e-08
1.437451.4298141.144430e-08
1.444821.429771.150302e-08
1.452231.4297261.156204e-08
1.459681.4296821.162136e-08
1.467171.4296381.168098e-08
1.474691.4295931.174092e-08
1.482251.4295481.180115e-08
1.489861.4295031.186170e-08
1.49751.4294581.192256e-08
1.505181.4294121.198373e-08
1.51291.4293661.204522e-08
1.520651.429321.210702e-08
1.528451.4292731.216913e-08
1.536291.4292261.223157e-08
1.544171.4291791.229432e-08
1.552091.4291321.235740e-08
1.560051.4290841.242080e-08
1.568051.4290361.248453e-08
1.576091.4289871.254858e-08
1.584181.4289391.261296e-08
1.59231.4288891.267767e-08
1.61.4288431.273900e-08
1.600471.428841.274271e-08
1.608671.428791.280805e-08
1.616921.428741.287372e-08
1.625221.428691.293973e-08
1.633551.4286391.300607e-08
1.641931.4285881.307276e-08
1.650351.4285361.313979e-08
1.658811.4284841.320716e-08
1.667321.4284321.327488e-08
1.675871.4283791.334294e-08
1.684471.4283261.341136e-08
1.693111.4282731.348012e-08
1.701791.4282191.354924e-08
1.710521.4281641.361871e-08
1.719291.428111.368854e-08
1.728111.4280541.375873e-08
1.736971.4279991.382927e-08
1.745881.4279431.390018e-08
1.754831.4278861.397145e-08
1.763831.4278291.404309e-08
1.772881.4277721.411510e-08
1.781971.4277141.418747e-08
1.791111.4276561.426022e-08
1.81.4275991.433100e-08
1.800291.4275971.433333e-08
1.809531.4275371.440683e-08
1.818811.4274781.448070e-08
1.828131.4274171.455495e-08
1.837511.4273561.462958e-08
1.846931.4272951.470459e-08
1.856411.4272331.477999e-08
1.865931.4271711.485577e-08
1.87551.4271081.493194e-08
1.885111.4270441.500851e-08
1.894781.426981.508546e-08
1.90451.4269161.516281e-08
1.914271.426851.524056e-08
1.924081.4267851.531871e-08
1.933951.4267181.539725e-08
1.943871.4266511.547620e-08
1.953841.4265841.555556e-08
1.963861.4265161.563532e-08
1.973931.4264471.571549e-08
1.984051.4263781.579607e-08
1.994231.4263081.587707e-08
21.4262681.592300e-08
2.004461.4262371.595850e-08
2.014741.4261661.604038e-08
2.025071.4260941.612268e-08
2.035461.4260211.620540e-08
2.045891.4259481.628854e-08
2.056391.4258741.637212e-08
2.066931.4257991.645612e-08
2.077531.4257241.654055e-08
2.088191.4256471.662541e-08
2.09891.4255711.671071e-08
2.109661.4254931.679645e-08
2.120481.4254151.688263e-08
2.131361.4253361.696925e-08
2.142291.4252561.705631e-08
2.153271.4251751.714382e-08
2.164321.4250941.723178e-08
2.175421.4250121.732019e-08
2.186571.4249291.740905e-08
2.197791.4248451.749837e-08
2.21.4248281.751600e-08
2.209061.424761.845431e-08
2.220391.4246751.962796e-08
2.231771.4245892.080762e-08
2.243221.4245022.199334e-08
2.254721.4244142.318514e-08
2.266291.4243252.438304e-08
2.277911.4242352.558710e-08
2.289591.4241442.679732e-08
2.301331.4240532.801376e-08
2.313141.423962.923643e-08
2.3251.4238673.046537e-08

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
—