Optical constants

Refractive index of K-CaFK95 (SUMITA)

K-CaFK95: n,k 0.36–1.55 µm

Data
formula 3 + tabulated k
Range
0.36–1.55 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.36–1.55 µm
Refractive index n
1.43425
Extinction coefficient k
9.36134e-09
Permittivity ε1
2.05708
Permittivity ε2
2.68531e-08
Absorption coefficient α
0.00200201 cm⁻¹
Penetration depth δ = λ/(2πk)
9.98996e+09 nm
Abbe number Vd
94.771
Chromatic dispersion dn/dλ
-0.0237952 µm⁻¹
Group index ng
1.44823
Group velocity dispersion
40.4366 fs²/mm
Dispersion parameter D
-220.603 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

# K-CaFK95 (SUMITA): K-CaFK95
sumita_k_cafk95 = ls.fetch_refractiveindex("specs", "SUMITA-optical", "K-CaFK95", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(sumita_k_cafk95.range_nm)  # (360, 1550) nm
eps = sumita_k_cafk95.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

Polynomial (formula 3), λ in µm
n2=2.0408226−0.0045471403⁢λ2.0+0.0058631038⁢λ−2.0+0.00012966471⁢λ−4.0−1.1902639×10-5⁢λ−6.0+6.9279944×10-7⁢λ−8.0

Valid from 0.36 to 1.55 µm.

Coefficients as stored
CiValue
C12.0408226
C2-0.0045471403
C32.0
C40.0058631038
C5-2.0
C60.00012966471
C7-4.0
C8-1.1902639e-05
C9-6.0
C106.9279944e-07
C11-8.0

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: -2.06e-05 -5.62e-09 -2.69e-11 3.17e-07 3.49e-10 0.174
nd
1.43425
Vd
95.0
glass code
434950
density
value: 3540
thermal expansion
value: 1.29e-05, temperature range: 243 343; value: 1.67e-05, temperature range: 293 573
dPgF
0.0483
resistance
acid: 4.0; climatic: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = -7.26e-06 K⁻¹ at 633 nm, dn/dT = -7.41e-06 K⁻¹ at 1310 nm, dn/dT = -7.41e-06 K⁻¹ at 1550 nm

References

Cite

SUMITA Zemax catalog 2017-02-02 (obtained from http://www.sumita-opt.co.jp); See also SUMITA optical glass data book; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 416 wavelengths, the same grid as the API and the library
K-CaFK95 (SUMITA), K-CaFK95: n and k versus wavelength
λ (µm)nk
0.361.4457464.620700e-08
0.361321.4456084.244766e-08
0.3626441.4454713.867455e-08
0.3639731.4453363.488760e-08
0.3653081.4452023.108677e-08
0.3666471.4450682.727201e-08
0.3679911.4449362.344326e-08
0.369341.4448061.960048e-08
0.371.4447421.771900e-08
0.3706931.4446761.712034e-08
0.3720521.4445471.594721e-08
0.3734161.4444191.476977e-08
0.3747851.4442931.358802e-08
0.3761591.4441671.240193e-08
0.3775371.4440431.121150e-08
0.3789211.4439191.001670e-08
0.381.4438249.085500e-09
0.380311.4437978.996351e-09
0.3817041.4436758.595946e-09
0.3831041.4435558.194073e-09
0.3845081.4434357.790727e-09
0.3859171.4433177.385903e-09
0.3873321.4431996.979594e-09
0.3887521.4430836.571796e-09
0.391.4429816.213300e-09
0.3901771.4429676.216117e-09
0.3916071.4428526.238901e-09
0.3930431.4427396.261768e-09
0.3944831.4426266.284719e-09
0.3959291.4425146.307754e-09
0.3973811.4424026.330874e-09
0.3988371.4422926.354078e-09
0.41.4422056.372600e-09
0.4002991.4421836.377368e-09
0.4017671.4420746.400743e-09
0.4032391.4419676.424203e-09
0.4047171.441866.447749e-09
0.4062011.4417546.471382e-09
0.407691.4416496.495102e-09
0.4091841.4415446.518908e-09
0.4106841.4414416.542802e-09
0.412191.4413386.566783e-09
0.4137011.4412366.590852e-09
0.4152171.4411356.615009e-09
0.4167391.4410356.639255e-09
0.4182671.4409356.663590e-09
0.41981.4408366.688014e-09
0.421.4408236.691200e-09
0.4213391.4407386.712527e-09
0.4228831.4406416.737131e-09
0.4244331.4405446.761824e-09
0.4259891.4404486.786608e-09
0.4275511.4403536.811483e-09
0.4291181.4402596.836449e-09
0.4306911.4401656.861507e-09
0.432271.4400726.886656e-09
0.4338541.439986.911898e-09
0.4354451.4398886.937232e-09
0.4370411.4397976.962659e-09
0.4386431.4397076.988179e-09
0.441.4396327.009800e-09
0.4402511.4396187.013794e-09
0.4418641.4395297.039510e-09
0.4434841.4394417.065320e-09
0.445111.4393537.091224e-09
0.4467411.4392667.117224e-09
0.4483791.439187.143319e-09
0.4500231.4390947.169509e-09
0.4516721.4390097.195796e-09
0.4533281.4389257.222179e-09
0.454991.4388417.248658e-09
0.4566571.4387587.275235e-09
0.4583311.4386767.301909e-09
0.461.4385947.328500e-09
0.4600111.4385947.328681e-09
0.4616981.4385137.355543e-09
0.463391.4384327.382503e-09
0.4650891.4383527.409561e-09
0.4667931.4382727.436719e-09
0.4685051.4381937.463977e-09
0.4702221.4381157.491334e-09
0.4719461.4380377.518792e-09
0.4736751.437967.546351e-09
0.4754121.4378837.574010e-09
0.4771541.4378077.601771e-09
0.4789041.4377327.629634e-09
0.481.4376857.647100e-09
0.4806591.4376577.657598e-09
0.4824211.4375827.685666e-09
0.4841891.4375087.713836e-09
0.4859641.4374357.742109e-09
0.4877461.4373627.770486e-09
0.4895331.437297.798967e-09
0.4913281.4372187.827553e-09
0.4931291.4371477.856243e-09
0.4949361.4370767.885038e-09
0.4967511.4370067.913939e-09
0.4985721.4369367.942946e-09
0.51.4368827.965700e-09
0.5003991.4368667.972060e-09
0.5022331.4367988.001284e-09
0.5040741.4367298.030614e-09
0.5059221.4366618.060053e-09
0.5077771.4365948.089599e-09
0.5096381.4365278.119253e-09
0.5115061.4364618.149016e-09
0.5133811.4363958.178889e-09
0.5152631.4363298.208870e-09
0.5171521.4362648.238962e-09
0.5190471.43628.269164e-09
0.520951.4361368.299477e-09
0.522861.4360728.329900e-09
0.5247761.4360098.360436e-09
0.52671.4359468.391083e-09
0.5286311.4358838.421843e-09
0.5305681.4358228.452715e-09
0.5325131.435768.483700e-09
0.5344651.4356998.514799e-09
0.5364241.4356388.546013e-09
0.5383911.4355788.577340e-09
0.5403641.4355188.608782e-09
0.5423451.4354598.640340e-09
0.5443331.43548.672013e-09
0.5463281.4353418.703803e-09
0.5483311.4352838.735708e-09
0.551.4352358.762300e-09
0.5503411.4352258.767731e-09
0.5523581.4351688.799871e-09
0.5543831.4351118.832130e-09
0.5564151.4350548.864506e-09
0.5584551.4349988.897001e-09
0.5605021.4349428.929615e-09
0.5625561.4348868.962348e-09
0.5646191.4348318.995202e-09
0.5666881.4347769.028176e-09
0.5687651.4347229.061271e-09
0.570851.4346689.094487e-09
0.5729431.4346149.127825e-09
0.5750431.4345619.161285e-09
0.5771511.4345089.194868e-09
0.5792671.4344559.228574e-09
0.581391.4344039.262404e-09
0.5835211.4343519.296357e-09
0.585661.4342999.330435e-09
0.5878071.4342489.364638e-09
0.5899611.4341979.398966e-09
0.5921241.4341469.433420e-09
0.5942951.4340969.468001e-09
0.5964731.4340469.502708e-09
0.5986591.4339969.537542e-09
0.61.4339669.558900e-09
0.6008541.4339479.572496e-09
0.6030561.4338989.607564e-09
0.6052671.4338499.642761e-09
0.6074861.4338019.678087e-09
0.6097121.4337539.713542e-09
0.6119471.4337059.749127e-09
0.6141911.4336579.784843e-09
0.6164421.433619.820689e-09
0.6187021.4335639.856667e-09
0.620971.4335179.892777e-09
0.6232461.433479.929019e-09
0.625531.4334249.965394e-09
0.6278231.4333791.000190e-08
0.6301251.4333331.003854e-08
0.6324341.4332881.007532e-08
0.6347531.4332431.011223e-08
0.6370791.4331981.014928e-08
0.6394151.4331541.018646e-08
0.6417591.433111.022378e-08
0.6441111.4330661.026124e-08
0.6464721.4330221.029883e-08
0.6488421.4329791.033656e-08
0.651.4329581.035500e-08
0.651221.4329361.037445e-08
0.6536071.4328931.041250e-08
0.6560031.4328511.045069e-08
0.6584081.4328081.048902e-08
0.6608211.4327661.052749e-08
0.6632441.4327251.056610e-08
0.6656751.4326831.060486e-08
0.6681151.4326421.064375e-08
0.6705641.4326011.068279e-08
0.6730221.432561.072197e-08
0.6754891.4325191.076130e-08
0.6779651.4324791.080077e-08
0.680451.4324391.084038e-08
0.6829451.4323991.088014e-08
0.6854481.4323591.092004e-08
0.6879611.4323191.096009e-08
0.6904821.432281.100029e-08
0.6930131.4322411.104063e-08
0.6955541.4322021.108113e-08
0.6981031.4321641.112177e-08
0.71.4321351.115200e-08
0.7006621.4321251.116255e-08
0.7032311.4320871.120347e-08
0.7058091.4320491.124453e-08
0.7083961.4320111.128574e-08
0.7109921.4319741.132711e-08
0.7135991.4319361.136863e-08
0.7162141.4318991.141030e-08
0.718841.4318621.145212e-08
0.7214751.4318251.149409e-08
0.7241191.4317881.153622e-08
0.7267741.4317521.157851e-08
0.7294381.4317161.162095e-08
0.7321121.431681.166354e-08
0.7347951.4316441.170629e-08
0.7374891.4316081.174920e-08
0.7401921.4315731.179226e-08
0.7429051.4315371.183548e-08
0.7456291.4315021.187886e-08
0.7483621.4314671.192240e-08
0.7511051.4314321.196610e-08
0.7538581.4313971.200996e-08
0.7566221.4313631.205398e-08
0.7593951.4313291.209816e-08
0.7621791.4312941.214251e-08
0.7649731.431261.218701e-08
0.7677771.4312261.223168e-08
0.7705911.4311931.227652e-08
0.7734161.4311591.232151e-08
0.7762511.4311261.236668e-08
0.7790961.4310921.241200e-08
0.7819521.4310591.245750e-08
0.7848181.4310261.250316e-08
0.7876951.4309941.254899e-08
0.7905831.4309611.259498e-08
0.7934811.4309281.264115e-08
0.7963891.4308961.268748e-08
0.7993091.4308641.273398e-08
0.81.4308561.274500e-08
0.8022381.4308311.278066e-08
0.8051791.4307991.282751e-08
0.8081311.4307681.287453e-08
0.8110931.4307361.292172e-08
0.8140661.4307041.296908e-08
0.817051.4306731.301662e-08
0.8200451.4306411.306433e-08
0.8230511.430611.311222e-08
0.8260681.4305791.316028e-08
0.8290961.4305481.320852e-08
0.8321351.4305171.325694e-08
0.8351861.4304861.330553e-08
0.8382471.4304551.335431e-08
0.841321.4304251.340326e-08
0.8444041.4303941.345239e-08
0.8474991.4303641.350169e-08
0.8506061.4303341.355119e-08
0.8537241.4303041.360086e-08
0.8568531.4302741.365071e-08
0.8599941.4302441.370075e-08
0.8631461.4302141.375097e-08
0.866311.4301841.380137e-08
0.8694861.4301541.385196e-08
0.8726731.4301251.390274e-08
0.8758721.4300951.395370e-08
0.8790821.4300661.400484e-08
0.8823051.4300371.405618e-08
0.8855391.4300081.410770e-08
0.8887851.4299781.415941e-08
0.8920431.4299491.421132e-08
0.8953131.429921.426341e-08
0.8985951.4298921.431569e-08
0.9018891.4298631.436817e-08
0.9051951.4298341.442083e-08
0.9085131.4298051.447369e-08
0.9118431.4297771.452675e-08
0.9151861.4297481.457999e-08
0.918541.429721.463344e-08
0.9219071.4296921.468708e-08
0.9252871.4296631.474091e-08
0.9286781.4296351.479494e-08
0.9320831.4296071.484918e-08
0.9354991.4295791.490361e-08
0.9389281.4295511.495824e-08
0.942371.4295231.501307e-08
0.9458241.4294951.506810e-08
0.9492911.4294671.512333e-08
0.9527711.4294391.517876e-08
0.9562641.4294111.523440e-08
0.9597691.4293841.529024e-08
0.9632871.4293561.534629e-08
0.9668181.4293281.540254e-08
0.9703621.4293011.545900e-08
0.9739191.4292731.551567e-08
0.9774891.4292461.557254e-08
0.9810721.4292181.562962e-08
0.9846681.4291911.568691e-08
0.9882781.4291641.574441e-08
0.9919011.4291361.580212e-08
0.9955361.4291091.586005e-08
0.9991861.4290821.591818e-08
1.002851.4290541.597653e-08
1.006521.4290271.603509e-08
1.010211.4291.609387e-08
1.013921.4289731.615286e-08
1.017631.4289461.621207e-08
1.021361.4289191.627150e-08
1.025111.4288921.633114e-08
1.028871.4288651.639100e-08
1.032641.4288381.645108e-08
1.036421.4288111.651139e-08
1.040221.4287841.657191e-08
1.044031.4287571.663265e-08
1.047861.428731.669362e-08
1.05171.4287031.675481e-08
1.055561.4286761.681623e-08
1.059431.4286491.687787e-08
1.061.4286451.688700e-08
1.063311.4286221.702977e-08
1.067211.4285951.719788e-08
1.071121.4285681.736660e-08
1.075051.4285411.753594e-08
1.078991.4285141.770590e-08
1.082941.4284871.787648e-08
1.086911.4284611.804769e-08
1.09091.4284341.821953e-08
1.094891.4284071.839199e-08
1.098911.428381.856509e-08
1.102941.4283531.873883e-08
1.106981.4283261.891320e-08
1.111041.4282991.908821e-08
1.115111.4282721.926386e-08
1.11921.4282451.944015e-08
1.12331.4282181.961709e-08
1.127421.4281911.979468e-08
1.131551.4281641.997292e-08
1.13571.4281372.015182e-08
1.139861.428112.033137e-08
1.144041.4280832.051157e-08
1.148231.4280562.069244e-08
1.152441.4280292.087397e-08
1.156671.4280022.105617e-08
1.160911.4279752.123903e-08
1.165161.4279472.142257e-08
1.169431.427922.160678e-08
1.173721.4278932.179166e-08
1.178021.4278662.197722e-08
1.182341.4278382.216346e-08
1.186671.4278112.235039e-08
1.191021.4277842.253799e-08
1.195391.4277562.272629e-08
1.199771.4277292.291528e-08
1.204171.4277012.310496e-08
1.208581.4276742.329533e-08
1.213011.4276462.348640e-08
1.217461.4276182.367818e-08
1.221921.4275912.387065e-08
1.22641.4275632.406383e-08
1.23091.4275352.425772e-08
1.235411.4275072.445232e-08
1.239941.4274792.464764e-08
1.244481.4274512.484367e-08
1.249041.4274232.504042e-08
1.253621.4273952.523788e-08
1.258221.4273672.543608e-08
1.262831.4273392.563500e-08
1.267461.427312.583465e-08
1.272111.4272822.603503e-08
1.276771.4272542.623614e-08
1.281451.4272252.643799e-08
1.286151.4271972.664059e-08
1.290861.4271682.684392e-08
1.295591.4271392.704800e-08
1.300341.427112.725283e-08
1.305111.4270822.745841e-08
1.309891.4270532.766474e-08
1.314691.4270242.787183e-08
1.319511.4269952.807968e-08
1.324351.4269652.828829e-08
1.32921.4269362.849767e-08
1.334081.4269072.870781e-08
1.338971.4268772.891872e-08
1.343881.4268482.913041e-08
1.34881.4268182.934287e-08
1.353751.4267882.955611e-08
1.358711.4267592.977013e-08
1.363691.4267292.998494e-08
1.368691.4266993.020053e-08
1.37371.4266693.041692e-08
1.378741.4266383.063409e-08
1.383791.4266083.085207e-08
1.388871.4265783.107084e-08
1.393961.4265473.129041e-08
1.399071.4265173.151079e-08
1.40421.4264863.173198e-08
1.409341.4264553.195398e-08
1.414511.4264243.217679e-08
1.419691.4263933.240042e-08
1.42491.4263623.262487e-08
1.430121.4263313.285014e-08
1.435361.4262993.307623e-08
1.440621.4262683.330316e-08
1.445911.4262363.353092e-08
1.451211.4262043.375951e-08
1.456521.4261723.398894e-08
1.461861.426143.421921e-08
1.467221.4261083.445033e-08
1.47261.4260763.468229e-08
1.4781.4260433.491510e-08
1.483421.4260113.514877e-08
1.488851.4259783.538329e-08
1.494311.4259453.561867e-08
1.499791.4259123.585492e-08
1.51.4259113.586400e-08
1.505291.4258793.700628e-08
1.51081.4258463.819842e-08
1.516341.4258123.939492e-08
1.52191.4257794.059581e-08
1.527481.4257454.180110e-08
1.533081.4257114.301080e-08
1.53871.4256774.422495e-08
1.544341.4256434.544354e-08
1.551.4256094.666660e-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
—