Optical constants

Refractive index of YLiF₄ (Yttrium lithium fluoride, YLF)

Barnes and Gettemy 1980: n(e) 0.225–2.6 µm

Data: formula 2
Range: 0.225–2.6 µm
Optical axis: e
Licence: CC0-1.0

Uniaxial crystal, axes: oe

Axis Log x Log y

Click the plot to set the calculator wavelength.

At one wavelength

Refractive index n: 1.47647
Extinction coefficient k: 0

Permittivity ε₁: 2.17997
Permittivity ε₂: 0

Absorption coefficient α: 0 cm⁻¹
Penetration depth δ = λ/(2πk): — nm

Abbe number V_d: 88.935
Chromatic dispersion dn/dλ: -0.0277273 µm⁻¹

Group index n_g: 1.49276
Group velocity dispersion: 48.4404 fs²/mm

Dispersion parameter D: -264.268 ps/(nm·km)
Photon energy: 2.11001 eV

ε = (n + ik)², α = 4πk/λ, n_g = 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

# YLiF4 (Yttrium lithium fluoride, YLF): Barnes and Gettemy 1980: n(e) 0.225–2.6 µm
ylif4 = ls.fetch_refractiveindex("main", "YLiF4", "Barnes-e", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(ylif4.range_nm)  # (225, 2600) nm
eps = ylif4.eps([633])  # complex permittivity

Downloads the original record once (pinned to the imported snapshot) and caches it.

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_02ef62b88af9/lightsmith"
ylif4 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(ylif4.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (ylif4/barnes-gettemy-1980-e).

# ... load ylif4 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=ylif4)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

Same spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_02ef62b88af9/lightsmith?model=drude_lorentz"
ylif4_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))

A dispersive Drude–Lorentz model for time-domain solvers.

Materials guide Open a sphere of it in Studio Quick start Ask the community

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

n^{2} - 1 = 0.31021 + \frac{0.84903 λ^{2}}{λ^{2} - 0.00876} + \frac{0.53607 λ^{2}}{λ^{2} - 134.9566}

Valid from 0.225 to 2.6 µm.

Coefficients as stored

C_i	Value
C1	0.31021
C2	0.84903
C3	0.00876
C4	0.53607
C5	134.9566

Comments and conditions

Room temperature. Extraordinary ray (e).

Conditions

direction: e

References

N. P. Barnes and D. J. Gettemy. Temperature variation of the refractive indices of yttrium lithium fluoride. J. Opt. Soc. Am. 70, 1244-1247 (1980)

doi:10.1364/josa.70.001244 Temperature variation of the refractive indices of yttrium lithium fluoride, Journal of the Optical Society of America (1980)

Cite

Norman P. Barnes and Donald J. Gettemy. Temperature variation of the refractive indices of yttrium lithium fluoride. Journal of the Optical Society of America, 70, 1244 (1980), doi:10.1364/josa.70.001244; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)

Data

Computed on 400 wavelengths, the same grid as the API and the library

CSV comma separated TXT tab separated YAML n, k Full database record original YAML All quantities CSV JSON metadata

YLiF4 (Yttrium lithium fluoride, YLF), Barnes and Gettemy 1980: n(e) 0.225–2.6 µm: n and k versus wavelength
λ (µm)	n
0.225	1.528625
0.226384	1.527769
0.227777	1.526928
0.229178	1.5261
0.230588	1.525286
0.232007	1.524486
0.233434	1.523699
0.23487	1.522924
0.236315	1.522162
0.237769	1.521412
0.239232	1.520675
0.240704	1.519949
0.242184	1.519235
0.243674	1.518532
0.245173	1.517841
0.246682	1.51716
0.248199	1.51649
0.249726	1.515831
0.251263	1.515182
0.252808	1.514543
0.254364	1.513914
0.255929	1.513295
0.257503	1.512685
0.259087	1.512085
0.260681	1.511494
0.262285	1.510912
0.263899	1.510339
0.265522	1.509775
0.267156	1.509219
0.268799	1.508672
0.270453	1.508133
0.272117	1.507602
0.273791	1.50708
0.275475	1.506564
0.27717	1.506057
0.278875	1.505557
0.280591	1.505065
0.282317	1.50458
0.284054	1.504102
0.285801	1.503631
0.28756	1.503168
0.289329	1.50271
0.291109	1.50226
0.2929	1.501816
0.294702	1.501379
0.296515	1.500948
0.298339	1.500523
0.300174	1.500105
0.302021	1.499692
0.303879	1.499285
0.305748	1.498885
0.307629	1.49849
0.309522	1.4981
0.311426	1.497717
0.313342	1.497338
0.31527	1.496965
0.317209	1.496597
0.319161	1.496235
0.321124	1.495878
0.3231	1.495525
0.325088	1.495178
0.327088	1.494835
0.3291	1.494498
0.331125	1.494165
0.333162	1.493836
0.335211	1.493512
0.337274	1.493193
0.339349	1.492878
0.341436	1.492568
0.343537	1.492261
0.34565	1.491959
0.347777	1.491661
0.349916	1.491368
0.352069	1.491078
0.354235	1.490792
0.356414	1.49051
0.358607	1.490232
0.360813	1.489958
0.363033	1.489687
0.365266	1.48942
0.367514	1.489157
0.369775	1.488897
0.372049	1.488641
0.374338	1.488388
0.376641	1.488138
0.378958	1.487892
0.38129	1.487649
0.383636	1.48741
0.385996	1.487173
0.38837	1.48694
0.39076	1.48671
0.393164	1.486483
0.395582	1.486259
0.398016	1.486037
0.400465	1.485819
0.402928	1.485604
0.405407	1.485391
0.407901	1.485181
0.410411	1.484974
0.412936	1.48477
0.415476	1.484568
0.418032	1.484369
0.420604	1.484173
0.423192	1.483979
0.425795	1.483787
0.428415	1.483598
0.43105	1.483412
0.433702	1.483228
0.43637	1.483046
0.439055	1.482866
0.441756	1.482689
0.444474	1.482514
0.447208	1.482342
0.449959	1.482171
0.452728	1.482003
0.455513	1.481836
0.458315	1.481672
0.461135	1.48151
0.463972	1.48135
0.466826	1.481192
0.469698	1.481036
0.472588	1.480882
0.475495	1.48073
0.47842	1.48058
0.481364	1.480431
0.484325	1.480285
0.487305	1.48014
0.490303	1.479997
0.493319	1.479856
0.496354	1.479717
0.499408	1.479579
0.50248	1.479443
0.505571	1.479308
0.508682	1.479176
0.511811	1.479044
0.51496	1.478915
0.518128	1.478787
0.521316	1.47866
0.524523	1.478536
0.52775	1.478412
0.530996	1.47829
0.534263	1.47817
0.53755	1.478051
0.540857	1.477933
0.544184	1.477817
0.547532	1.477702
0.550901	1.477588
0.55429	1.477476
0.5577	1.477365
0.561131	1.477255
0.564583	1.477147
0.568057	1.47704
0.571551	1.476934
0.575068	1.476829
0.578605	1.476726
0.582165	1.476624
0.585747	1.476523
0.58935	1.476423
0.592976	1.476324
0.596624	1.476226
0.600294	1.47613
0.603987	1.476034
0.607703	1.47594
0.611442	1.475846
0.615204	1.475754
0.618988	1.475662
0.622796	1.475572
0.626628	1.475483
0.630483	1.475394
0.634362	1.475307
0.638264	1.47522
0.642191	1.475135
0.646142	1.47505
0.650117	1.474966
0.654117	1.474883
0.658141	1.474801
0.66219	1.47472
0.666264	1.47464
0.670363	1.47456
0.674487	1.474482
0.678636	1.474404
0.682811	1.474327
0.687012	1.47425
0.691239	1.474175
0.695491	1.4741
0.69977	1.474026
0.704075	1.473953
0.708406	1.47388
0.712765	1.473808
0.71715	1.473737
0.721562	1.473667
0.726001	1.473597
0.730467	1.473528
0.734961	1.473459
0.739483	1.473391
0.744032	1.473324
0.748609	1.473257
0.753215	1.473191
0.757849	1.473126
0.762511	1.473061
0.767202	1.472996
0.771922	1.472933
0.776671	1.47287
0.781449	1.472807
0.786257	1.472745
0.791094	1.472683
0.795961	1.472622
0.800857	1.472561
0.805784	1.472501
0.810742	1.472442
0.815729	1.472382
0.820748	1.472324
0.825797	1.472266
0.830878	1.472208
0.835989	1.47215
0.841132	1.472093
0.846307	1.472037
0.851514	1.471981
0.856752	1.471925
0.862023	1.47187
0.867326	1.471815
0.872662	1.47176
0.878031	1.471706
0.883433	1.471652
0.888867	1.471599
0.894336	1.471545
0.899838	1.471492
0.905374	1.47144
0.910944	1.471388
0.916548	1.471336
0.922187	1.471284
0.92786	1.471233
0.933568	1.471182
0.939312	1.471131
0.94509	1.47108
0.950905	1.47103
0.956755	1.47098
0.962641	1.47093
0.968563	1.470881
0.974522	1.470832
0.980517	1.470782
0.986549	1.470733
0.992619	1.470685
0.998725	1.470636
1.00487	1.470588
1.01105	1.47054
1.01727	1.470492
1.02353	1.470444
1.02983	1.470396
1.03616	1.470349
1.04254	1.470301
1.04895	1.470254
1.0554	1.470207
1.0619	1.47016
1.06843	1.470113
1.075	1.470066
1.08162	1.47002
1.08827	1.469973
1.09497	1.469926
1.1017	1.46988
1.10848	1.469834
1.1153	1.469787
1.12216	1.469741
1.12906	1.469695
1.13601	1.469649
1.143	1.469602
1.15003	1.469556
1.15711	1.46951
1.16423	1.469464
1.17139	1.469418
1.17859	1.469372
1.18584	1.469326
1.19314	1.469279
1.20048	1.469233
1.20787	1.469187
1.2153	1.469141
1.22277	1.469094
1.2303	1.469048
1.23787	1.469001
1.24548	1.468955
1.25314	1.468908
1.26085	1.468862
1.26861	1.468815
1.27641	1.468768
1.28427	1.468721
1.29217	1.468674
1.30012	1.468626
1.30812	1.468579
1.31616	1.468532
1.32426	1.468484
1.33241	1.468436
1.3406	1.468388
1.34885	1.46834
1.35715	1.468292
1.3655	1.468243
1.3739	1.468194
1.38235	1.468145
1.39086	1.468096
1.39941	1.468047
1.40802	1.467997
1.41669	1.467947
1.4254	1.467897
1.43417	1.467847
1.44299	1.467796
1.45187	1.467746
1.4608	1.467694
1.46979	1.467643
1.47883	1.467591
1.48793	1.467539
1.49708	1.467487
1.50629	1.467435
1.51556	1.467382
1.52488	1.467328
1.53427	1.467275
1.5437	1.467221
1.5532	1.467166
1.56276	1.467112
1.57237	1.467057
1.58204	1.467001
1.59178	1.466945
1.60157	1.466889
1.61142	1.466832
1.62134	1.466775
1.63131	1.466718
1.64135	1.46666
1.65145	1.466601
1.66161	1.466542
1.67183	1.466483
1.68211	1.466423
1.69246	1.466363
1.70287	1.466302
1.71335	1.466241
1.72389	1.466179
1.7345	1.466116
1.74517	1.466053
1.7559	1.46599
1.76671	1.465926
1.77757	1.465861
1.78851	1.465796
1.79951	1.46573
1.81058	1.465663
1.82172	1.465596
1.83293	1.465529
1.84421	1.46546
1.85555	1.465391
1.86697	1.465321
1.87845	1.465251
1.89001	1.46518
1.90164	1.465108
1.91334	1.465036
1.92511	1.464962
1.93695	1.464888
1.94887	1.464814
1.96086	1.464738
1.97292	1.464662
1.98506	1.464585
1.99727	1.464507
2.00956	1.464428
2.02192	1.464349
2.03436	1.464268
2.04688	1.464187
2.05947	1.464105
2.07214	1.464022
2.08489	1.463938
2.09771	1.463853
2.11062	1.463767
2.1236	1.46368
2.13667	1.463592
2.14981	1.463504
2.16304	1.463414
2.17635	1.463323
2.18973	1.463231
2.20321	1.463138
2.21676	1.463045
2.2304	1.462949
2.24412	1.462853
2.25793	1.462756
2.27182	1.462658
2.28579	1.462558
2.29986	1.462457
2.314	1.462355
2.32824	1.462252
2.34256	1.462148
2.35698	1.462042
2.37148	1.461935
2.38607	1.461827
2.40075	1.461717
2.41551	1.461606
2.43038	1.461494
2.44533	1.46138
2.46037	1.461265
2.47551	1.461149
2.49074	1.461031
2.50606	1.460911
2.52148	1.46079
2.53699	1.460668
2.5526	1.460544
2.5683	1.460418
2.5841	1.460291
2.6	1.460162

Optical transmission calculator

Free-standing sample in vacuum, normal incidence

Transmittance T: —
Reflectance R: —

Fresnel reflection calculator

R_p: —
R_s: —
R = (R_p+R_s)/2: —
Phase φ_p: —
Phase φ_s: —
Brewster angle θ_B: —
Critical angle θ_C: —

YLiF₄ (Yttrium lithium fluoride, YLF): all datasets

About YLiF4 (Yttrium lithium fluoride, YLF)

Yttrium lithium fluoride (YLiF₄), commonly referred to as YLF, is a synthetic crystalline material renowned for its unique optical properties. YLF crystals are often used as laser host materials due to their excellent optical homogeneity, high damage threshold, and broad transparency range. Specifically, the neodymium-doped YLF (Nd:YLF) finds applications in pulsed laser systems because of its favorable lasing transitions. The material also possesses a low phonon energy, which can minimize non-radiative decay in luminescent devices. Additionally, YLF crystals exhibit birefringence, making them suitable for certain phase-matching applications in nonlinear optics. The crystal's structure can also be oriented in specific directions to optimize certain laser properties. YLF is typically transparent with a colorless appearance in its bulk form.

Yttrium lithium fluoride - Wikipedia

More about YLiF4 (Yttrium lithium fluoride, YLF) →

Provenance

Version: 1 (snapshot c5c2f18)
Source page: refractiveindex.info
Original file: database/data/main/YLiF4/nk/Barnes-e.yml
ID: ds_02ef62b88af9
API: /v1/datasets/ds_02ef62b88af9

Plot