Optical constants

Refractive index of LAM61 (OHARA)

LAM61: n,k 0.3–2.4 µm

Data
formula 2 + tabulated k
Range
0.3–2.4 µm
Temperature
298 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength. Note: k data cover 340-2400 nm only; k = 0 elsewhere in the n range 300-2400 nm.

At one wavelength

Range 0.3–2.4 µm
Refractive index n
1.72
Extinction coefficient k
1.29605e-08
Permittivity ε1
2.9584
Permittivity ε2
4.45841e-08
Absorption coefficient α
0.00277172 cm⁻¹
Penetration depth δ = λ/(2πk)
7.21573e+09 nm
Abbe number Vd
46.035
Chromatic dispersion dn/dλ
-0.079956 µm⁻¹
Group index ng
1.76698
Group velocity dispersion
149.643 fs²/mm
Dispersion parameter D
-816.379 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

# LAM61 (OHARA): LAM61
ohara_lam61 = ls.fetch_refractiveindex("specs", "OHARA-optical", "LAM61", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ohara_lam61.range_nm)  # (300, 2400) nm
eps = ohara_lam61.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=1.706024λ2λ2−0.009579771+0.182716λ2λ2−0.04044097+1.204833λ2λ2−127.571

Valid from 0.3 to 2.4 µm.

Coefficients as stored
CiValue
C10.0
C21.706024
C30.009579771
C40.182716
C50.04044097
C61.204833
C7127.571

Comments and conditions

Conditions

temperature
298 K

Properties

thermal dispersion
type: formula A, coefficients: -1.7708e-06 0.0 0.0 0.0 0.0 0.0
nd
1.720002
Vd
46.035166
glass code
720460
glass status
preferred
density
value: 4280
thermal expansion
value: 8.5e-06, temperature range: 243 343; value: 9.6e-06, temperature range: 293 573
dPgF
-0.002
resistance
acid: 53.2; phosphate: 3.2

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 298.0 K): dn/dT = -1.00e-06 K⁻¹ at 633 nm, dn/dT = -9.83e-07 K⁻¹ at 1310 nm, dn/dT = -9.79e-07 K⁻¹ at 1550 nm
Notes on the source data (kept exactly as published):
  • k data cover 340-2400 nm only; k = 0 elsewhere in the n range 300-2400 nm

References

Cite

OHARA Zemax catalog 2017-11-30 (obtained from http://www.ohara-inc.co.jp); See also OHARA 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 422 wavelengths, the same grid as the API and the library
LAM61 (OHARA), LAM61: n and k versus wavelength
λ (µm)nk
0.31.8000590
0.3015681.7986280
0.3031431.7972260
0.3047271.795850
0.306321.7945010
0.307921.7931770
0.3095291.7918780
0.3111471.7906030
0.3127721.7893520
0.3144071.7881230
0.3160491.7869170
0.3177011.7857310
0.3193611.7845670
0.321031.7834240
0.3227071.78230
0.3243931.7811950
0.3260881.780110
0.3277921.7790430
0.3295051.7779940
0.3312271.7769620
0.3329581.7759470
0.3346971.7749490
0.3364461.7739680
0.3382041.7730020
0.3399711.7720520
0.341.7720379.487500e-06
0.3417481.7711178.523941e-06
0.3435341.7701977.539531e-06
0.3453291.7692916.549977e-06
0.3471331.76845.555252e-06
0.3489471.7675224.555329e-06
0.351.7670213.974800e-06
0.350771.7666583.804605e-06
0.3526031.7658073.399616e-06
0.3544461.764972.992512e-06
0.3562981.7641442.583280e-06
0.3581591.7633322.171910e-06
0.361.7625441.765200e-06
0.3600311.7625311.762371e-06
0.3619121.7617431.589642e-06
0.3638031.7609661.416011e-06
0.3657041.7602011.241473e-06
0.3676151.7594471.066022e-06
0.3695361.7587048.896553e-07
0.371.7585268.470400e-07
0.3714671.7579717.896950e-07
0.3734081.7572497.138096e-07
0.3753591.7565386.375276e-07
0.377321.7558375.608471e-07
0.3792921.7551464.837659e-07
0.381.7549014.560800e-07
0.3812741.7544644.283787e-07
0.3832661.7537923.850514e-07
0.3852691.753133.414976e-07
0.3872821.7524772.977163e-07
0.3893051.7518322.537062e-07
0.391.7516142.386000e-07
0.391341.7511972.267176e-07
0.3933841.7505712.085799e-07
0.395441.7499531.903474e-07
0.3975061.7493431.720196e-07
0.3995831.7487421.535960e-07
0.41.7486231.499000e-07
0.4016711.7481491.438727e-07
0.403771.7475641.363033e-07
0.405881.7469871.286943e-07
0.4080011.7464171.210456e-07
0.4101331.7458551.133569e-07
0.4122761.7453011.056280e-07
0.414431.7447549.785875e-08
0.4165951.7442149.004890e-08
0.4187721.7436818.219823e-08
0.421.7433857.777000e-08
0.420961.7431557.674753e-08
0.423161.7426367.440560e-08
0.4253711.7421247.205143e-08
0.4275941.7416186.968496e-08
0.4298281.7411196.730612e-08
0.4320741.7406266.491485e-08
0.4343321.7401396.251109e-08
0.4366011.7396596.009477e-08
0.4388821.7391855.766582e-08
0.441.7389565.647600e-08
0.4411761.7387175.553617e-08
0.4434811.7382545.369347e-08
0.4457981.7377985.184114e-08
0.4481281.7373474.997913e-08
0.4504691.7369024.810740e-08
0.4528231.7364624.622588e-08
0.4551891.7360284.433453e-08
0.4575681.7355994.243330e-08
0.4599591.7351764.052213e-08
0.461.7351684.048900e-08
0.4623621.7347573.933070e-08
0.4647781.7343443.814592e-08
0.4672061.7339363.695495e-08
0.4696481.7335333.575775e-08
0.4721021.7331343.455430e-08
0.4745691.7327413.334456e-08
0.4770481.7323523.212850e-08
0.4795411.7319683.090608e-08
0.481.7318983.068100e-08
0.4820471.7315892.958221e-08
0.4845661.7312142.822999e-08
0.4870981.7308432.687070e-08
0.4896431.7304772.550431e-08
0.4922011.7301152.413078e-08
0.4947731.7297582.275007e-08
0.4973581.7294052.136215e-08
0.4999571.7290551.996698e-08
0.51.729051.994400e-08
0.502571.728711.936935e-08
0.5051961.7283691.878208e-08
0.5078351.7280321.819174e-08
0.5104891.7276991.759831e-08
0.5131561.727371.700178e-08
0.5158381.7270451.640214e-08
0.5185331.7267231.579936e-08
0.5212431.7264051.519343e-08
0.5239661.726091.458434e-08
0.5267041.725781.397206e-08
0.5294561.7254721.335659e-08
0.5322231.7251681.273790e-08
0.5350041.7248681.211597e-08
0.5377991.7245711.149080e-08
0.5406091.7242771.086236e-08
0.5434341.7239871.023064e-08
0.5462741.72379.595611e-09
0.5491281.7234168.957268e-09
0.551.723338.762300e-09
0.5519981.7231358.985330e-09
0.5548821.7228589.307375e-09
0.5577811.7225839.631104e-09
0.5606961.7223129.956524e-09
0.5636261.7220431.028364e-08
0.5665711.7217771.061247e-08
0.5695311.7215151.094302e-08
0.5725071.7212551.127530e-08
0.5754981.7209981.160931e-08
0.5785061.7207441.194506e-08
0.5815281.7204921.228258e-08
0.5845671.7202431.262185e-08
0.5876221.7199971.296290e-08
0.5906921.7197531.330573e-08
0.5937791.7195131.365035e-08
0.5968811.7192741.399677e-08
0.61.7190381.434500e-08
0.6031351.7188051.474548e-08
0.6062871.7185741.514806e-08
0.6094551.7183461.555274e-08
0.6126391.7181191.595953e-08
0.615841.7178961.636845e-08
0.6190581.7176741.677951e-08
0.6222931.7174551.719271e-08
0.6255451.7172381.760807e-08
0.6288131.7170241.802561e-08
0.6320991.7168111.844532e-08
0.6354021.7166011.886723e-08
0.6387221.7163931.929134e-08
0.6420591.7161871.971767e-08
0.6454141.7159832.014623e-08
0.6487871.7157812.057703e-08
0.651.7157092.073200e-08
0.6521771.7155812.055803e-08
0.6555851.7153832.028568e-08
0.659011.7151872.001190e-08
0.6624541.7149931.973670e-08
0.6659151.7148011.946006e-08
0.6693951.7146111.918197e-08
0.6728921.7144221.890243e-08
0.6764091.7142361.862143e-08
0.6799431.7140511.833896e-08
0.6834961.7138681.805502e-08
0.6870671.7136871.776959e-08
0.6906571.7135081.748267e-08
0.6942661.713331.719425e-08
0.6978941.7131541.690432e-08
0.71.7130531.673600e-08
0.7015411.7129791.667452e-08
0.7052061.7128071.652822e-08
0.7088911.7126361.638116e-08
0.7125951.7124661.623332e-08
0.7163191.7122981.608472e-08
0.7200621.7121321.593534e-08
0.7238241.7119671.578518e-08
0.7276061.7118031.563423e-08
0.7314081.7116411.548250e-08
0.735231.7114811.532997e-08
0.7390721.7113221.517665e-08
0.7429341.7111641.502252e-08
0.7468161.7110081.486759e-08
0.7507181.7108531.471185e-08
0.7546411.71071.455530e-08
0.7585841.7105481.439792e-08
0.7625471.7103971.423973e-08
0.7665321.7102481.408071e-08
0.7705371.7100991.392086e-08
0.7745641.7099521.376017e-08
0.7786111.7098071.359864e-08
0.7826791.7096621.343627e-08
0.7867691.7095191.327305e-08
0.790881.7093771.310898e-08
0.7950121.7092361.294405e-08
0.7991671.7090961.277826e-08
0.81.7090681.274500e-08
0.8033421.7089571.279825e-08
0.807541.708821.286511e-08
0.811761.7086831.293233e-08
0.8160011.7085481.299990e-08
0.8202651.7084141.306782e-08
0.8245511.708281.313610e-08
0.828861.7081481.320473e-08
0.8331911.7080171.327373e-08
0.8375441.7078871.334308e-08
0.8419211.7077581.341280e-08
0.846321.7076291.348288e-08
0.8507421.7075021.355332e-08
0.8551871.7073761.362414e-08
0.8596561.707251.369532e-08
0.8641481.7071261.376688e-08
0.8686631.7070021.383881e-08
0.8732021.7068791.391111e-08
0.8777651.7067571.398380e-08
0.8823511.7066361.405686e-08
0.8869621.7065161.413030e-08
0.8915971.7063961.420413e-08
0.8962551.7062781.427835e-08
0.91.7061831.433800e-08
0.9009391.706161.442783e-08
0.9056461.7060431.487839e-08
0.9103781.7059261.533131e-08
0.9151351.7058111.578660e-08
0.9199171.7056961.624427e-08
0.9247241.7055821.670432e-08
0.9295561.7054681.716678e-08
0.9344131.7053551.763166e-08
0.9392951.7052431.809897e-08
0.9442041.7051321.856872e-08
0.9491371.7050211.904092e-08
0.9540971.7049111.951559e-08
0.9590821.7048011.999274e-08
0.9640931.7046922.047239e-08
0.9691311.7045842.095454e-08
0.9741951.7044762.143921e-08
0.9792851.7043692.192641e-08
0.9844021.7042622.241616e-08
0.9895461.7041562.290846e-08
0.9947171.704052.340334e-08
0.9999141.7039452.390081e-08
11.7039432.390900e-08
1.005141.703842.403188e-08
1.010391.7037362.415746e-08
1.015671.7036332.428369e-08
1.020981.703532.441058e-08
1.026311.7034272.453814e-08
1.031681.7033252.466636e-08
1.037071.7032232.479525e-08
1.042491.7031212.492482e-08
1.047931.703022.505506e-08
1.053411.702922.518599e-08
1.058911.7028192.531760e-08
1.064451.7027192.544989e-08
1.070011.702622.558288e-08
1.07561.7025212.571656e-08
1.081221.7024222.585094e-08
1.086871.7023232.598602e-08
1.092551.7022252.612181e-08
1.098261.7021272.625831e-08
1.1041.7020292.639552e-08
1.109761.7019322.653345e-08
1.115561.7018352.667210e-08
1.121391.7017382.681147e-08
1.127251.7016422.695157e-08
1.133141.7015452.709241e-08
1.139061.7014492.723398e-08
1.145011.7013532.737628e-08
1.1511.7012572.751934e-08
1.157011.7011622.766314e-08
1.163061.7010662.780769e-08
1.169131.7009712.795300e-08
1.175241.7008762.809906e-08
1.181381.7007812.824589e-08
1.187561.7006862.839349e-08
1.193761.7005922.854186e-08
1.21.7004972.869100e-08
1.21.7004972.869100e-08
1.206271.7004022.954229e-08
1.212571.7003083.039802e-08
1.218911.7002143.125822e-08
1.225281.7001193.212292e-08
1.231681.7000253.299214e-08
1.238121.6999313.386590e-08
1.244591.6998373.474423e-08
1.251091.6997433.562714e-08
1.257631.6996493.651467e-08
1.26421.6995553.740683e-08
1.27081.699463.830366e-08
1.277441.6993663.920518e-08
1.284121.6992724.011140e-08
1.290831.6991784.102236e-08
1.297571.6990844.193808e-08
1.304351.6989894.285858e-08
1.311171.6988954.378390e-08
1.318021.69884.471405e-08
1.324911.6987064.564906e-08
1.331831.6986114.658895e-08
1.338791.6985164.753376e-08
1.345781.6984214.848350e-08
1.352821.6983264.943821e-08
1.359891.698235.039790e-08
1.366991.6981355.136261e-08
1.374131.6980395.233236e-08
1.381311.6979435.330718e-08
1.388531.6978475.428709e-08
1.395791.6977515.527212e-08
1.41.6976955.584400e-08
1.403081.6976545.636155e-08
1.410411.6975585.759308e-08
1.417781.6974615.883105e-08
1.425191.6973636.007549e-08
1.432641.6972666.132643e-08
1.440121.6971686.258391e-08
1.447651.697076.384795e-08
1.455211.6969726.511860e-08
1.462821.6968736.639590e-08
1.470461.6967746.767986e-08
1.478141.6966746.897054e-08
1.485871.6965757.026796e-08
1.493631.6964757.157215e-08
1.501441.6963747.288317e-08
1.509281.6962737.420103e-08
1.517171.6961727.552578e-08
1.525091.696077.685745e-08
1.533061.6959687.819608e-08
1.541071.6958657.954170e-08
1.549131.6957628.089436e-08
1.557221.6956598.225408e-08
1.565361.6955558.362091e-08
1.573541.6954518.499488e-08
1.581761.6953468.637603e-08
1.590021.695248.776440e-08
1.598331.6951348.916002e-08
1.61.6951138.944000e-08
1.606681.6950289.417292e-08
1.615081.6949211.001168e-07
1.623521.6948131.060917e-07
1.6321.6947051.120979e-07
1.640531.6945961.181354e-07
1.64911.6944871.242045e-07
1.657721.6943771.303053e-07
1.666381.6942661.364380e-07
1.675091.6941551.426027e-07
1.683841.6940431.487997e-07
1.692641.693931.550290e-07
1.701481.6938171.612909e-07
1.710371.6937031.675854e-07
1.719311.6935881.739129e-07
1.72831.6934731.802735e-07
1.737331.6933571.866672e-07
1.74641.693241.930944e-07
1.755531.6931221.995552e-07
1.76471.6930032.060497e-07
1.773921.6928842.125782e-07
1.783191.6927642.191407e-07
1.792511.6926432.257376e-07
1.81.6925462.310400e-07
1.801881.6925212.414500e-07
1.811291.6923992.936662e-07
1.820761.6922753.461554e-07
1.830271.6921513.989187e-07
1.839831.6920264.519578e-07
1.849451.6918995.052740e-07
1.859111.6917725.588688e-07
1.868831.6916446.127437e-07
1.878591.6915156.669000e-07
1.888411.6913857.213394e-07
1.898271.6912547.760632e-07
1.908191.6911228.310729e-07
1.918161.6909898.863701e-07
1.928191.6908559.419562e-07
1.938261.6907199.978328e-07
1.948391.6905831.054001e-06
1.958571.6904461.110463e-06
1.96881.6903071.167220e-06
1.979091.6901671.224274e-06
1.989431.6900261.281626e-06
1.999831.6898841.339277e-06
2.010281.6897411.397230e-06
2.020781.6895971.455485e-06
2.031341.6894511.514045e-06
2.041961.6893041.572911e-06
2.052631.6891561.632085e-06
2.063351.6890061.691567e-06
2.074131.6888561.751361e-06
2.084971.6887031.811467e-06
2.095861.688551.871887e-06
2.106821.6883951.932622e-06
2.117821.6882391.993675e-06
2.128891.6880812.055047e-06
2.140011.6879222.116740e-06
2.15121.6877622.178755e-06
2.162441.68762.241094e-06
2.173741.6874362.303759e-06
2.18511.6872712.366752e-06
2.196511.6871042.430073e-06
2.207991.6869362.493725e-06
2.219531.6867672.557710e-06
2.231121.6865952.622030e-06
2.242781.6864222.686685e-06
2.25451.6862482.751678e-06
2.266281.6860712.817011e-06
2.278121.6858932.882685e-06
2.290031.6857142.948703e-06
2.301991.6855323.015065e-06
2.314021.6853493.081774e-06
2.326111.6851643.148832e-06
2.338271.6849773.216240e-06
2.350491.6847883.284000e-06
2.362771.6845973.352114e-06
2.375111.6844053.420584e-06
2.387521.684213.489412e-06
2.41.6840143.558600e-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
—