Optical constants

Refractive index of K-ZnSF8(M) (SUMITA)

K-ZnSF8(M): 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
1.71142
Extinction coefficient k
2.67161e-08
Permittivity ε1
2.92896
Permittivity ε2
9.14449e-08
Absorption coefficient α
0.00571348 cm⁻¹
Penetration depth δ = λ/(2πk)
3.50050e+09 nm
Abbe number Vd
38.905
Chromatic dispersion dn/dλ
-0.0931154 µm⁻¹
Group index ng
1.76614
Group velocity dispersion
177.214 fs²/mm
Dispersion parameter D
-966.799 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-ZnSF8(M) (SUMITA): K-ZnSF8(M)
sumita_k_znsf8_m = ls.fetch_refractiveindex("specs", "SUMITA-optical", "K-ZnSF8(M)", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(sumita_k_znsf8_m.range_nm)  # (360, 1550) nm
eps = sumita_k_znsf8_m.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=2.8508369−0.012006057⁢λ2.0+0.025904826⁢λ−2.0+0.0009056149⁢λ−4.0−2.8090015×10-5⁢λ−6.0+4.695922×10-6⁢λ−8.0

Valid from 0.36 to 1.55 µm.

Coefficients as stored
CiValue
C12.8508369
C2-0.012006057
C32.0
C40.025904826
C5-2.0
C60.0009056149
C7-4.0
C8-2.8090015e-05
C9-6.0
C104.695922e-06
C11-8.0

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 1.49e-05 1.99e-08 -2.6e-10 8.88e-07 7.78e-10 0.234
nd
1.71143
Vd
38.9
glass code
714389
density
value: 3720
thermal expansion
value: 4.9e-06, temperature range: 243 343; value: 6e-06, temperature range: 293 573
dPgF
-0.0047
resistance
acid: 4.0; climatic: 2.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 9.80e-06 K⁻¹ at 633 nm, dn/dT = 8.44e-06 K⁻¹ at 1310 nm, dn/dT = 8.32e-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-ZnSF8(M) (SUMITA), K-ZnSF8(M): n and k versus wavelength
λ (µm)nk
0.361.7626181.046500e-06
0.361321.7619239.784656e-07
0.3626441.7612359.101818e-07
0.3639731.7605558.416477e-07
0.3653081.7598847.728624e-07
0.3666471.759227.038250e-07
0.3679911.7585636.345345e-07
0.369341.7579155.649900e-07
0.371.7576015.309400e-07
0.3706931.7572735.150547e-07
0.3720521.7566394.839255e-07
0.3734161.7560124.526822e-07
0.3747851.7553924.213244e-07
0.3761591.7547793.898516e-07
0.3775371.7541733.582635e-07
0.3789211.7535733.265595e-07
0.381.7531123.018500e-07
0.380311.7529812.984414e-07
0.3817041.7523942.831317e-07
0.3831041.7518142.677658e-07
0.3845081.7512412.523437e-07
0.3859171.7506732.368650e-07
0.3873321.7501122.213296e-07
0.3887521.7495562.057373e-07
0.391.7490751.920300e-07
0.3901771.7490071.908734e-07
0.3916071.7484631.815196e-07
0.3930431.7479261.721316e-07
0.3944831.7473931.627091e-07
0.3959291.7468671.532521e-07
0.3973811.7463461.437605e-07
0.3988371.745831.342340e-07
0.41.7454241.266300e-07
0.4002991.745321.260013e-07
0.4017671.7448151.229191e-07
0.4032391.7443151.198256e-07
0.4047171.743821.167207e-07
0.4062011.7433311.136045e-07
0.407691.7428461.104768e-07
0.4091841.7423661.073377e-07
0.4106841.7418921.041870e-07
0.412191.7414211.010248e-07
0.4137011.7409569.785104e-08
0.4152171.7404959.466562e-08
0.4167391.7400399.146853e-08
0.4182671.7395888.825972e-08
0.41981.739148.503915e-08
0.421.7390828.461900e-08
0.4213391.7386988.345076e-08
0.4228831.7382598.210306e-08
0.4244331.7378258.075041e-08
0.4259891.7373957.939282e-08
0.4275511.7369697.803024e-08
0.4291181.7365487.666267e-08
0.4306911.736137.529009e-08
0.432271.7357167.391247e-08
0.4338541.7353077.252981e-08
0.4354451.7349017.114207e-08
0.4370411.7344996.974925e-08
0.4386431.7341016.835133e-08
0.441.7337686.716700e-08
0.4402511.7337076.701858e-08
0.4418641.7333166.606297e-08
0.4434841.732936.510386e-08
0.445111.7325466.414124e-08
0.4467411.7321676.317509e-08
0.4483791.7317916.220539e-08
0.4500231.7314186.123214e-08
0.4516721.7310496.025533e-08
0.4533281.7306835.927493e-08
0.454991.730325.829094e-08
0.4566571.7299615.730334e-08
0.4583311.7296055.631212e-08
0.461.7292555.532400e-08
0.4600111.7292535.531877e-08
0.4616981.7289035.454226e-08
0.463391.7285575.376291e-08
0.4650891.7282145.298070e-08
0.4667931.7278745.219562e-08
0.4685051.7275375.140767e-08
0.4702221.7272035.061683e-08
0.4719461.7268724.982308e-08
0.4736751.7265444.902643e-08
0.4754121.7262194.822686e-08
0.4771541.7258974.742436e-08
0.4789041.7255784.661891e-08
0.481.725384.611400e-08
0.4806591.7252614.617730e-08
0.4824211.7249474.634653e-08
0.4841891.7246364.651638e-08
0.4859641.7243284.668686e-08
0.4877461.7240234.685796e-08
0.4895331.723724.702968e-08
0.4913281.7234194.720204e-08
0.4931291.7231224.737503e-08
0.4949361.7228274.754865e-08
0.4967511.7225344.772291e-08
0.4985721.7222444.789780e-08
0.51.7220194.803500e-08
0.5003991.7219564.793217e-08
0.5022331.7216714.745966e-08
0.5040741.7213894.698542e-08
0.5059221.7211084.650944e-08
0.5077771.720834.603172e-08
0.5096381.7205554.555224e-08
0.5115061.7202824.507101e-08
0.5133811.7200114.458801e-08
0.5152631.7197424.410325e-08
0.5171521.7194764.361670e-08
0.5190471.7192124.312838e-08
0.520951.718954.263826e-08
0.522861.718694.214635e-08
0.5247761.7184324.165263e-08
0.52671.7181774.115710e-08
0.5286311.7179234.065976e-08
0.5305681.7176724.016059e-08
0.5325131.7174233.965960e-08
0.5344651.7171763.915677e-08
0.5364241.7169313.865209e-08
0.5383911.7166873.814557e-08
0.5403641.7164463.763718e-08
0.5423451.7162073.712694e-08
0.5443331.715973.661482e-08
0.5463281.7157353.610083e-08
0.5483311.7155013.558495e-08
0.551.7153093.515500e-08
0.5503411.715273.507849e-08
0.5523581.715043.462572e-08
0.5543831.7148123.417129e-08
0.5564151.7145863.371519e-08
0.5584551.7143623.325742e-08
0.5605021.7141393.279797e-08
0.5625561.7139193.233684e-08
0.5646191.71373.187402e-08
0.5666881.7134833.140950e-08
0.5687651.7132673.094328e-08
0.570851.7130533.047535e-08
0.5729431.7128413.000571e-08
0.5750431.7126312.953434e-08
0.5771511.7124222.906125e-08
0.5792671.7122152.858642e-08
0.581391.7120092.810985e-08
0.5835211.7118052.763154e-08
0.585661.7116032.715147e-08
0.5878071.7114022.666964e-08
0.5899611.7112032.618605e-08
0.5921241.7110052.570068e-08
0.5942951.7108092.521353e-08
0.5964731.7106142.472460e-08
0.5986591.7104212.423387e-08
0.61.7103032.393300e-08
0.6008541.7102292.378968e-08
0.6030561.7100392.342001e-08
0.6052671.709852.304899e-08
0.6074861.7096622.267661e-08
0.6097121.7094762.230286e-08
0.6119471.7092922.192774e-08
0.6141911.7091082.155125e-08
0.6164421.7089272.117338e-08
0.6187021.7087462.079412e-08
0.620971.7085672.041347e-08
0.6232461.7083892.003143e-08
0.625531.7082121.964799e-08
0.6278231.7080371.926314e-08
0.6301251.7078631.887688e-08
0.6324341.707691.848920e-08
0.6347531.7075191.810010e-08
0.6370791.7073491.770958e-08
0.6394151.707181.731763e-08
0.6417591.7070121.692423e-08
0.6441111.7068461.652940e-08
0.6464721.706681.613312e-08
0.6488421.7065161.573539e-08
0.651.7064371.554100e-08
0.651221.7063531.557016e-08
0.6536071.7061911.562722e-08
0.6560031.7060311.568448e-08
0.6584081.7058711.574195e-08
0.6608211.7057131.579963e-08
0.6632441.7055561.585752e-08
0.6656751.7053991.591563e-08
0.6681151.7052441.597395e-08
0.6705641.705091.603248e-08
0.6730221.7049381.609123e-08
0.6754891.7047861.615019e-08
0.6779651.7046351.620937e-08
0.680451.7044851.626876e-08
0.6829451.7043371.632838e-08
0.6854481.7041891.638821e-08
0.6879611.7040421.644826e-08
0.6904821.7038961.650853e-08
0.6930131.7037521.656902e-08
0.6955541.7036081.662974e-08
0.6981031.7034651.669067e-08
0.71.703361.673600e-08
0.7006621.7033231.670956e-08
0.7032311.7031831.660706e-08
0.7058091.7030431.650418e-08
0.7083961.7029041.640093e-08
0.7109921.7027661.629729e-08
0.7135991.7026291.619328e-08
0.7162141.7024921.608888e-08
0.718841.7023571.598410e-08
0.7214751.7022221.587894e-08
0.7241191.7020891.577339e-08
0.7267741.7019561.566746e-08
0.7294381.7018241.556113e-08
0.7321121.7016931.545442e-08
0.7347951.7015631.534732e-08
0.7374891.7014341.523982e-08
0.7401921.7013051.513193e-08
0.7429051.7011771.502364e-08
0.7456291.701051.491496e-08
0.7483621.7009241.480588e-08
0.7511051.7007991.469640e-08
0.7538581.7006741.458652e-08
0.7566221.700551.447623e-08
0.7593951.7004271.436554e-08
0.7621791.7003051.425445e-08
0.7649731.7001831.414294e-08
0.7677771.7000631.403103e-08
0.7705911.6999421.391871e-08
0.7734161.6998231.380598e-08
0.7762511.6997041.369283e-08
0.7790961.6995861.357927e-08
0.7819521.6994691.346529e-08
0.7848181.6993521.335089e-08
0.7876951.6992371.323608e-08
0.7905831.6991211.312084e-08
0.7934811.6990071.300519e-08
0.7963891.6988931.288910e-08
0.7993091.6987791.277260e-08
0.81.6987531.274500e-08
0.8022381.6986671.278066e-08
0.8051791.6985551.282751e-08
0.8081311.6984431.287453e-08
0.8110931.6983331.292172e-08
0.8140661.6982231.296908e-08
0.817051.6981131.301662e-08
0.8200451.6980041.306433e-08
0.8230511.6978961.311222e-08
0.8260681.6977881.316028e-08
0.8290961.6976811.320852e-08
0.8321351.6975741.325694e-08
0.8351861.6974681.330553e-08
0.8382471.6973631.335431e-08
0.841321.6972581.340326e-08
0.8444041.6971531.345239e-08
0.8474991.697051.350169e-08
0.8506061.6969461.355119e-08
0.8537241.6968431.360086e-08
0.8568531.6967411.365071e-08
0.8599941.6966391.370075e-08
0.8631461.6965381.375097e-08
0.866311.6964371.380137e-08
0.8694861.6963371.385196e-08
0.8726731.6962371.390274e-08
0.8758721.6961381.395370e-08
0.8790821.6960391.400484e-08
0.8823051.6959411.405618e-08
0.8855391.6958431.410770e-08
0.8887851.6957451.415941e-08
0.8920431.6956481.421132e-08
0.8953131.6955521.426341e-08
0.8985951.6954561.431569e-08
0.9018891.695361.436817e-08
0.9051951.6952651.442083e-08
0.9085131.695171.447369e-08
0.9118431.6950761.452675e-08
0.9151861.6949821.457999e-08
0.918541.6948881.463344e-08
0.9219071.6947951.468708e-08
0.9252871.6947021.474091e-08
0.9286781.6946091.479494e-08
0.9320831.6945171.484918e-08
0.9354991.6944261.490361e-08
0.9389281.6943341.495824e-08
0.942371.6942431.501307e-08
0.9458241.6941531.506810e-08
0.9492911.6940631.512333e-08
0.9527711.6939731.517876e-08
0.9562641.6938831.523440e-08
0.9597691.6937941.529024e-08
0.9632871.6937051.534629e-08
0.9668181.6936161.540254e-08
0.9703621.6935281.545900e-08
0.9739191.693441.551567e-08
0.9774891.6933521.557254e-08
0.9810721.6932651.562962e-08
0.9846681.6931781.568691e-08
0.9882781.6930911.574441e-08
0.9919011.6930051.580212e-08
0.9955361.6929191.586005e-08
0.9991861.6928331.591818e-08
1.002851.6927471.597653e-08
1.006521.6926621.603509e-08
1.010211.6925771.609387e-08
1.013921.6924921.615286e-08
1.017631.6924071.621207e-08
1.021361.6923231.627150e-08
1.025111.6922391.633114e-08
1.028871.6921551.639100e-08
1.032641.6920711.645108e-08
1.036421.6919881.651139e-08
1.040221.6919041.657191e-08
1.044031.6918211.663265e-08
1.047861.6917391.669362e-08
1.05171.6916561.675481e-08
1.055561.6915741.681623e-08
1.059431.6914921.687787e-08
1.061.6914791.688700e-08
1.063311.691411.693974e-08
1.067211.6913281.700184e-08
1.071121.6912461.706416e-08
1.075051.6911651.712671e-08
1.078991.6910831.718950e-08
1.082941.6910021.725251e-08
1.086911.6909211.731575e-08
1.09091.6908411.737923e-08
1.094891.690761.744294e-08
1.098911.6906791.750688e-08
1.102941.6905991.757105e-08
1.106981.6905191.763547e-08
1.111041.6904391.770011e-08
1.115111.6903591.776500e-08
1.11921.6902791.783012e-08
1.12331.6901991.789548e-08
1.127421.690121.796108e-08
1.131551.690041.802692e-08
1.13571.6899611.809301e-08
1.139861.6898821.815933e-08
1.144041.6898031.822590e-08
1.148231.6897241.829271e-08
1.152441.6896451.835977e-08
1.156671.6895661.842707e-08
1.160911.6894871.849462e-08
1.165161.6894081.856241e-08
1.169431.689331.863046e-08
1.173721.6892511.869875e-08
1.178021.6891721.876730e-08
1.182341.6890941.883610e-08
1.186671.6890161.890514e-08
1.191021.6889371.897445e-08
1.195391.6888591.904400e-08
1.199771.6887811.911381e-08
1.204171.6887021.918388e-08
1.208581.6886241.925420e-08
1.213011.6885461.932478e-08
1.217461.6884681.939562e-08
1.221921.688391.946672e-08
1.22641.6883111.953808e-08
1.23091.6882331.960970e-08
1.235411.6881551.968159e-08
1.239941.6880771.975374e-08
1.244481.6879991.982615e-08
1.249041.6879211.989883e-08
1.253621.6878421.997177e-08
1.258221.6877642.004498e-08
1.262831.6876862.011846e-08
1.267461.6876082.019221e-08
1.272111.687532.026623e-08
1.276771.6874512.034052e-08
1.281451.6873732.041509e-08
1.286151.6872942.048992e-08
1.290861.6872162.056503e-08
1.295591.6871372.064042e-08
1.300341.6870592.071608e-08
1.305111.686982.079202e-08
1.309891.6869022.086824e-08
1.314691.6868232.094474e-08
1.319511.6867442.102151e-08
1.324351.6866652.109857e-08
1.32921.6865862.117592e-08
1.334081.6865072.125354e-08
1.338971.6864282.133145e-08
1.343881.6863482.140965e-08
1.34881.6862692.148813e-08
1.353751.686192.156690e-08
1.358711.686112.164596e-08
1.363691.686032.172531e-08
1.368691.685952.180495e-08
1.37371.685872.188488e-08
1.378741.685792.196510e-08
1.383791.685712.204562e-08
1.388871.685632.212643e-08
1.393961.6855492.220754e-08
1.399071.6854682.228895e-08
1.40421.6853882.237065e-08
1.409341.6853072.245266e-08
1.414511.6852252.253496e-08
1.419691.6851442.261757e-08
1.42491.6850632.270048e-08
1.430121.6849812.278370e-08
1.435361.6848992.286721e-08
1.440621.6848172.295104e-08
1.445911.6847352.303517e-08
1.451211.6846532.311961e-08
1.456521.684572.320436e-08
1.461861.6844872.328942e-08
1.467221.6844042.337480e-08
1.47261.6843212.346048e-08
1.4781.6842372.354648e-08
1.483421.6841542.363280e-08
1.488851.684072.371943e-08
1.494311.6839862.380638e-08
1.499791.6839012.389365e-08
1.51.6838982.389700e-08
1.505291.6838172.998923e-08
1.51081.6837323.634731e-08
1.516341.6836474.272870e-08
1.52191.6835624.913349e-08
1.527481.6834765.556175e-08
1.533081.683396.201358e-08
1.53871.6833046.848905e-08
1.544341.6832187.498826e-08
1.551.6831318.151130e-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
—