Optical constants

Refractive index of N-LASF44 (SCHOTT)

N-LASF44: n,k 0.334–2.5 µm

Data
formula 2 + tabulated k
Range
0.334–2.5 µm
Temperature
293 K
Licence
CC0-1.0

Plot

Click the plot to set the calculator wavelength.

At one wavelength

Range 0.334–2.5 µm
Refractive index n
1.8042
Extinction coefficient k
9.37538e-09
Permittivity ε1
3.25513
Permittivity ε2
3.38300e-08
Absorption coefficient α
0.00200501 cm⁻¹
Penetration depth δ = λ/(2πk)
9.97501e+09 nm
Abbe number Vd
46.501
Chromatic dispersion dn/dλ
-0.088741 µm⁻¹
Group index ng
1.85634
Group velocity dispersion
162.125 fs²/mm
Dispersion parameter D
-884.477 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

# N-LASF44 (SCHOTT): N-LASF44
schott_n_lasf44 = ls.fetch_refractiveindex("specs", "SCHOTT-optical", "N-LASF44", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(schott_n_lasf44.range_nm)  # (334, 2500) nm
eps = schott_n_lasf44.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=1.78897105λ2λ2−0.00872506277+0.38675867λ2λ2−0.0308085023+1.30506243λ2λ2−92.7743824

Valid from 0.334 to 2.5 µm.

Coefficients as stored
CiValue
C10.0
C21.78897105
C30.00872506277
C40.38675867
C50.0308085023
C61.30506243
C792.7743824

Comments and conditions

Conditions

temperature
293 K

Properties

thermal dispersion
type: formula A, coefficients: 3.32e-06 1.12e-08 -8.52e-12 5.88e-07 7.13e-10 0.209
nd
1.8042
Vd
46.5
glass code
804465.444
glass status
standard
density
value: 4440
thermal expansion
value: 6.21e-06, temperature range: 243 343; value: 7.39e-06, temperature range: 293 573
dPgF
-0.0084
resistance
acid: 4.0; stain: 1.0; alkali: 1.0; climatic: 1.0; phosphate: 1.0

Thermo-optic coefficient

  • Schott thermal-dispersion model (reference temperature 293.0 K): dn/dT = 3.09e-06 K⁻¹ at 633 nm, dn/dT = 2.24e-06 K⁻¹ at 1310 nm, dn/dT = 2.16e-06 K⁻¹ at 1550 nm

References

Cite

SCHOTT Zemax catalog 2017-01-20b (obtained from http://www.schott.com); See also SCHOTT 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 420 wavelengths, the same grid as the API and the library
N-LASF44 (SCHOTT), N-LASF44: n and k versus wavelength
λ (µm)nk
0.3341.8637372.583900e-06
0.3356891.8627422.434243e-06
0.3373871.8617622.283830e-06
0.3390931.8607952.132656e-06
0.3408081.8598421.980717e-06
0.3425321.8589031.828010e-06
0.3442641.8579771.674530e-06
0.3460061.8570641.520274e-06
0.3477561.8561631.365238e-06
0.3495141.8552751.209418e-06
0.351.8550331.166400e-06
0.3512821.8543991.114977e-06
0.3530591.8535351.043722e-06
0.3548441.8526839.721058e-07
0.3566391.8518439.001276e-07
0.3584431.8510148.277853e-07
0.3602561.8501967.550772e-07
0.3620781.8493896.820014e-07
0.3639091.8485936.085560e-07
0.3651.8481265.648000e-07
0.365751.8478085.469284e-07
0.3675991.8470335.028212e-07
0.3694591.8462684.584909e-07
0.371.8460484.455800e-07
0.3713271.8455134.236774e-07
0.3732051.8447683.926824e-07
0.3750931.8440333.615306e-07
0.376991.8433083.302212e-07
0.3788961.8425922.987535e-07
0.381.8421832.805400e-07
0.3808131.8418852.717901e-07
0.3827391.8411872.510547e-07
0.3846741.8404992.302145e-07
0.386621.8398192.092688e-07
0.3885751.8391471.882172e-07
0.391.8386661.728800e-07
0.3905411.8384851.700253e-07
0.3925161.837831.595962e-07
0.3945011.8371841.491143e-07
0.3964961.8365471.385795e-07
0.3985021.8359171.279914e-07
0.41.8354531.200800e-07
0.4005171.8352951.187779e-07
0.4025431.834681.136773e-07
0.4045791.8340741.085509e-07
0.4051.8339491.074900e-07
0.4066251.8334751.032744e-07
0.4086811.8328839.793887e-08
0.4107481.8322989.257636e-08
0.4128261.8317218.718672e-08
0.4149141.8311518.176983e-08
0.4170121.8305877.632554e-08
0.4191211.8300317.085372e-08
0.421.8298026.857400e-08
0.4212411.8294816.709025e-08
0.4233721.8289386.454313e-08
0.4255131.8284026.198313e-08
0.4276651.8278725.941018e-08
0.4298281.8273485.682422e-08
0.4320021.826835.422518e-08
0.4341871.8263195.161299e-08
0.4361.8259014.944500e-08
0.4363831.8258144.919992e-08
0.438591.8253154.778612e-08
0.4408081.8248214.636516e-08
0.4430371.8243344.493702e-08
0.4452781.8238524.350165e-08
0.447531.8233764.205903e-08
0.4497941.8229054.060911e-08
0.4520681.822443.915186e-08
0.4543551.821983.768723e-08
0.4566531.8215253.621520e-08
0.4589621.8210763.473572e-08
0.461.8208773.407100e-08
0.4612841.8206323.354259e-08
0.4636171.8201933.258215e-08
0.4659611.8197593.161685e-08
0.4683181.819333.064668e-08
0.4706871.8189062.967159e-08
0.4730671.8184872.869158e-08
0.475461.8180722.770661e-08
0.4778641.8176622.671666e-08
0.4802811.8172572.572170e-08
0.482711.8168562.472170e-08
0.4851521.816462.371665e-08
0.4876051.8160682.270652e-08
0.4900721.8156812.169128e-08
0.492551.8152982.067090e-08
0.4950411.8149191.964537e-08
0.4975451.8145441.861464e-08
0.51.8141821.760400e-08
0.5000611.8141731.759212e-08
0.5025911.8138071.710322e-08
0.5051321.8134441.661184e-08
0.5076871.8130861.611797e-08
0.5102551.8127311.562161e-08
0.5128361.812381.512274e-08
0.5154291.8120331.462134e-08
0.5180361.811691.411741e-08
0.5206561.8113511.361093e-08
0.5232891.8110151.310189e-08
0.5259361.8106821.259027e-08
0.5285961.8103541.207607e-08
0.531271.8100281.155926e-08
0.5339561.8097071.103984e-08
0.5366571.8093881.051780e-08
0.5393711.8090739.993111e-09
0.5420991.8087619.465772e-09
0.5448411.8084538.935765e-09
0.5461.8083248.711700e-09
0.5475971.8081488.737169e-09
0.5503661.8078468.781351e-09
0.553151.8075478.825757e-09
0.5559471.8072518.870387e-09
0.5587591.8069588.915243e-09
0.5615851.8066688.960326e-09
0.5644251.8063829.005637e-09
0.567281.8060989.051177e-09
0.5701491.8058179.096947e-09
0.5730331.8055399.142949e-09
0.5759311.8052649.189184e-09
0.5788441.8049919.235652e-09
0.581.8048849.254100e-09
0.5817711.8047229.282364e-09
0.5847141.8044559.329317e-09
0.5876711.804199.376507e-09
0.5906431.8039299.423936e-09
0.593631.8036699.471605e-09
0.5966331.8034139.519515e-09
0.599651.8031599.567668e-09
0.6026831.8029079.616064e-09
0.6057311.8026589.664705e-09
0.6087951.8024129.713591e-09
0.6118741.8021689.762725e-09
0.6149681.8019269.812108e-09
0.6180791.8016869.861740e-09
0.621.801549.892400e-09
0.6212051.8014499.911632e-09
0.6243461.8012149.961791e-09
0.6275041.8009821.001220e-08
0.6306781.8007511.006287e-08
0.6338681.8005231.011380e-08
0.6370731.8002971.016498e-08
0.6402961.8000731.021642e-08
0.6435341.7998511.026812e-08
0.6467891.7996311.032008e-08
0.650061.7994131.037231e-08
0.6533481.7991981.042479e-08
0.6566521.7989841.047755e-08
0.6599731.7987721.053057e-08
0.661.798771.053100e-08
0.6633111.7985621.039852e-08
0.6666661.7983541.026429e-08
0.6700381.7981481.012937e-08
0.6734261.7979449.993780e-09
0.6768321.7977419.857500e-09
0.6802551.7975419.720530e-09
0.6836961.7973429.582868e-09
0.6871541.7971459.444510e-09
0.6906291.7969499.305452e-09
0.6941221.7967569.165691e-09
0.6976331.7965649.025223e-09
0.71.7964368.930500e-09
0.7011611.7963738.956244e-09
0.7047071.7961859.034876e-09
0.7082711.7959989.113906e-09
0.7118541.7958129.193336e-09
0.7154541.7956289.273167e-09
0.7190721.7954469.353402e-09
0.7227091.7952659.434043e-09
0.7263641.7950859.515092e-09
0.7300381.7949089.596551e-09
0.733731.7947319.678421e-09
0.7374411.7945569.760706e-09
0.7411711.7943829.843407e-09
0.7449191.794219.926526e-09
0.7486871.7940391.001007e-08
0.7524741.793871.009403e-08
0.7562791.7937021.017841e-08
0.7601041.7935351.026323e-08
0.7639491.7933691.034847e-08
0.7678121.7932051.043414e-08
0.7716961.7930421.052025e-08
0.7755991.792881.060679e-08
0.7795211.7927191.069377e-08
0.7834641.792561.078119e-08
0.7874261.7924021.086906e-08
0.7914091.7922451.095736e-08
0.7954111.7920891.104611e-08
0.7994341.7919341.113532e-08
0.8034781.791781.122497e-08
0.8075411.7916281.131508e-08
0.8116251.7914761.140564e-08
0.815731.7913251.149666e-08
0.8198561.7911761.158814e-08
0.8240031.7910271.168008e-08
0.828171.790881.177249e-08
0.8323591.7907331.186537e-08
0.8365681.7905881.195871e-08
0.8407991.7904431.205253e-08
0.8450521.79031.214682e-08
0.8493261.7901571.224159e-08
0.8536211.7900151.233684e-08
0.8579391.7898741.243257e-08
0.8622781.7897341.252878e-08
0.8666391.7895941.262548e-08
0.8710221.7894561.272267e-08
0.8754271.7893181.282036e-08
0.8798551.7891821.291853e-08
0.8843051.7890451.301720e-08
0.8887771.788911.311637e-08
0.8932721.7887761.321605e-08
0.897791.7886421.331622e-08
0.9023311.7885091.341691e-08
0.9068951.7883761.351810e-08
0.9114811.7882451.361980e-08
0.9160911.7881141.372202e-08
0.9207241.7879831.382476e-08
0.9253811.7878541.392801e-08
0.9300611.7877251.403179e-08
0.9347651.7875961.413609e-08
0.9394931.7874681.424092e-08
0.9442451.7873411.434628e-08
0.949021.7872141.445218e-08
0.953821.7870881.455861e-08
0.9586441.7869631.466557e-08
0.9634921.7868381.477308e-08
0.9683651.7867131.488113e-08
0.9732631.7865891.498973e-08
0.9781851.7864661.509888e-08
0.9831331.7863431.520858e-08
0.9881051.786221.531883e-08
0.9931031.7860981.542964e-08
0.9981251.7859761.554101e-08
1.003171.7858551.565295e-08
1.008251.7857341.576545e-08
1.013351.7856141.587852e-08
1.018471.7854941.599216e-08
1.023621.7853741.610638e-08
1.02881.7852551.622118e-08
1.0341.7851361.633655e-08
1.039231.7850171.645251e-08
1.044491.7848991.656906e-08
1.049771.7847811.668619e-08
1.055081.7846631.680392e-08
1.061.7845541.691300e-08
1.060421.7845451.700734e-08
1.065781.7844281.822133e-08
1.071171.7843111.944145e-08
1.076591.7841942.066775e-08
1.082031.7840782.190025e-08
1.087511.7839622.313898e-08
1.093011.7838452.438398e-08
1.098531.783732.563527e-08
1.104091.7836142.689290e-08
1.109671.7834982.815688e-08
1.115291.7833832.942726e-08
1.120931.7832683.070406e-08
1.12661.7831523.198731e-08
1.132291.7830373.327706e-08
1.138021.7829223.457334e-08
1.143781.7828083.587616e-08
1.149561.7826933.718558e-08
1.155371.7825783.850162e-08
1.161221.7824633.982432e-08
1.167091.7823494.115370e-08
1.172991.7822344.248981e-08
1.178931.7821194.383268e-08
1.184891.7820054.518234e-08
1.190881.781894.653882e-08
1.19691.7817764.790216e-08
1.202961.7816614.927241e-08
1.209041.7815465.064958e-08
1.215161.7814315.203371e-08
1.22131.7813165.342485e-08
1.227481.7812015.482302e-08
1.233691.7810865.622826e-08
1.239931.7809715.764061e-08
1.24621.7808565.906011e-08
1.25251.780746.048678e-08
1.258841.7806246.192067e-08
1.26521.7805096.336181e-08
1.27161.7803936.481024e-08
1.278031.7802766.626599e-08
1.28451.780166.772911e-08
1.290991.7800436.919963e-08
1.297521.7799267.067758e-08
1.304091.7798097.216301e-08
1.310681.7796927.365595e-08
1.317311.7795747.515645e-08
1.323971.7794567.666453e-08
1.330671.7793387.818024e-08
1.33741.779227.970361e-08
1.344161.7791018.123469e-08
1.350961.7789818.277352e-08
1.357791.7788628.432012e-08
1.364661.7787428.587455e-08
1.371561.7786228.743684e-08
1.37851.7785018.900703e-08
1.385471.778389.058517e-08
1.392481.7782589.217128e-08
1.399521.7781369.376542e-08
1.40661.7780149.536762e-08
1.413711.7778919.697792e-08
1.420861.7777689.859637e-08
1.428051.7776441.002230e-07
1.435271.7775191.018579e-07
1.442531.7773941.035010e-07
1.449831.7772691.051524e-07
1.457161.7771431.068122e-07
1.464531.7770161.084804e-07
1.471941.7768891.101570e-07
1.479381.7767621.118421e-07
1.486861.7766331.135357e-07
1.494381.7765041.152379e-07
1.501941.7763751.169487e-07
1.509541.7762451.186682e-07
1.517171.7761141.203963e-07
1.524851.7759821.221332e-07
1.531.7758941.233000e-07
1.532561.775851.276591e-07
1.540311.7757171.408707e-07
1.54811.7755831.541491e-07
1.555931.7754491.674946e-07
1.56381.7753141.809077e-07
1.571711.7751781.943885e-07
1.579661.7750412.079376e-07
1.587651.7749032.215552e-07
1.595681.7747652.352416e-07
1.603751.7746262.489973e-07
1.611861.7744852.628226e-07
1.620011.7743452.767177e-07
1.62821.7742032.906832e-07
1.636441.774063.047193e-07
1.644711.7739163.188263e-07
1.653031.7737723.330048e-07
1.661391.7736263.472549e-07
1.669791.7734793.615771e-07
1.678241.7733323.759717e-07
1.686731.7731833.904392e-07
1.695261.7730344.049798e-07
1.703831.7728834.195939e-07
1.712451.7727314.342820e-07
1.721111.7725794.490443e-07
1.729821.7724254.638813e-07
1.738561.772274.787934e-07
1.747361.7721144.937809e-07
1.756191.7719565.088441e-07
1.765081.7717985.239836e-07
1.7741.7716385.391996e-07
1.782981.7714775.544926e-07
1.791991.7713155.698629e-07
1.801061.7711525.853110e-07
1.810171.7709876.008372e-07
1.819321.7708216.164419e-07
1.828521.7706546.321255e-07
1.837771.7704856.478885e-07
1.847071.7703156.637312e-07
1.856411.7701446.796540e-07
1.86581.7699716.956574e-07
1.875231.7697977.117417e-07
1.884721.7696227.279073e-07
1.894251.7694457.441547e-07
1.903831.7692667.604843e-07
1.913461.7690867.768964e-07
1.923141.7689047.933916e-07
1.932861.7687218.099702e-07
1.942641.7685368.266326e-07
1.952461.768358.433793e-07
1.962341.7681628.602107e-07
1.971.7680168.732700e-07
1.972261.7679729.033230e-07
1.982241.7677811.035791e-06
1.992261.7675881.168930e-06
2.002341.7673931.302741e-06
2.012471.7671971.437230e-06
2.022641.7669981.572398e-06
2.032871.7667981.708250e-06
2.043161.7665961.844790e-06
2.053491.7663931.982020e-06
2.063881.7661872.119944e-06
2.074311.7659792.258565e-06
2.08481.765772.397888e-06
2.095351.7655582.537915e-06
2.105951.7653452.678650e-06
2.11661.7651292.820098e-06
2.12731.7649122.962260e-06
2.138061.7646923.105142e-06
2.148881.764473.248746e-06
2.159741.7642463.393077e-06
2.170671.764023.538137e-06
2.181641.7637923.683932e-06
2.192681.7635613.830463e-06
2.203771.7633283.977736e-06
2.214911.7630934.125753e-06
2.226121.7628564.274520e-06
2.237381.7626164.424038e-06
2.248691.7623744.574313e-06
2.260061.7621294.725348e-06
2.271491.7618824.877146e-06
2.282981.7616325.029713e-06
2.294531.761385.183051e-06
2.306131.7611255.337164e-06
2.31781.7608685.492057e-06
2.3251.7607085.587700e-06
2.329521.7606085.833343e-06
2.34131.7603456.473554e-06
2.353141.7600797.117004e-06
2.365051.7598117.763707e-06
2.377011.759548.413682e-06
2.389031.7592669.066943e-06
2.401111.7589899.723509e-06
2.413261.758711.038340e-05
2.425461.7584271.104662e-05
2.437731.7581411.171320e-05
2.450061.7578531.238315e-05
2.462451.7575611.305648e-05
2.47491.7572661.373323e-05
2.487421.7569681.441339e-05
2.51.7566661.509700e-05

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
—