Optical constants
Refractive index of TlBr40Cl60 - KRS6 (CRYSTRAN)
TlBr40Cl60 - KRS6: n,k 0.6–24 µm
- Data
- tabulated n + tabulated k
- Range
- 0.6–24 µm
- Points
- 29
- Licence
- CC0-1.0
Plot
Click the plot to set the calculator wavelength. Note: k data cover 376-22200 nm only; k = 0 elsewhere in the n range 600-24000 nm.
At one wavelength
- Refractive index n
- 2.19631
- Extinction coefficient k
- 9.63100e-06
- Permittivity ε1
- 4.8238
- Permittivity ε2
- 4.23054e-05
- Absorption coefficient α
- 0.319332 cm⁻¹
- Penetration depth δ = λ/(2πk)
- 6.26308e+07 nm
- Abbe number Vd
- —
- Chromatic dispersion dn/dλ
- -0.0034 µm⁻¹
- Group index ng
- 2.2092
- Group velocity dispersion
- — fs²/mm
- Dispersion parameter D
- — ps/(nm·km)
- Photon energy
- 0.327135 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
# TlBr40Cl60 - KRS6 (CRYSTRAN): TlBr40Cl60 - KRS6
crystran_krs6 = ls.fetch_refractiveindex("specs", "CRYSTRAN-optical", "KRS6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(crystran_krs6.range_nm) # (600, 24000) nm
eps = crystran_krs6.eps([633]) # complex permittivityDownloads 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_2b57d2b13177/lightsmith"
crystran_krs6 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(crystran_krs6.source) # citation and provenance travel with the dataAny dataset here, as the library's Tabulated material (crystran-krs6/crystran).
# ... load crystran_krs6 as above, then:
sim = ls.Simulation(
particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=crystran_krs6)],
medium_index=1.0,
wavelengths=ls.WavelengthRange(start_nm=600, stop_nm=1000, num=81),
)
res = ls.solve(sim) # exact Mie for a sphere
print(res.q_ext) # extinction efficiency at each wavelengthSame spec runs with DDA, FDTD, BEM or T-matrix: ls.compare(sim, ["mie", "dda"]).
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.
Comments and conditions
Properties
- density
- value: 7180
- thermal expansion
- value: 50e-06
- hardness
- type: Knoop, value: 2.93e8, indenter mass: 0.5
- melting point
- value: 696
- thermal conductivity
- value: 0.7, temperature: 293
- youngs modulus
- value: 20.68e9
- poissons ratio
- value: 0.219
- solubility
- value: 3, temperature: 293
- k data cover 376-22200 nm only; k = 0 elsewhere in the n range 600-24000 nm
References
See also Crystran KRS6 online data sheet
Cite
Crystran Ltd. The Crystran handbook of infra-red and ultra-violet optical materials (5th edition, 2023); See also Crystran KRS6 online data sheet; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)
Data
Computed on 29 wavelengths, the same grid as the API and the library| λ (µm) | n | k |
|---|---|---|
| 0.6 | 2.3294 | 2.350000e-06 |
| 0.7 | 2.2982 | 2.080000e-06 |
| 0.8 | 2.266 | 1.930000e-06 |
| 0.9 | 2.251 | 1.810000e-06 |
| 1 | 2.2404 | 1.760000e-06 |
| 1.5 | 2.2148 | 3.230000e-06 |
| 2 | 2.2059 | 5.180000e-06 |
| 3 | 2.199 | 8.530000e-06 |
| 4 | 2.1956 | 1.010000e-05 |
| 5 | 2.1928 | 1.320000e-05 |
| 6 | 2.19 | 1.650000e-05 |
| 7 | 2.187 | 1.900000e-05 |
| 8 | 2.1839 | 2.210000e-05 |
| 9 | 2.1805 | 2.500000e-05 |
| 10 | 2.1767 | 2.650000e-05 |
| 11 | 2.1723 | 2.860000e-05 |
| 12 | 2.1674 | 3.140000e-05 |
| 13 | 2.162 | 3.390000e-05 |
| 14 | 2.1563 | 3.680000e-05 |
| 15 | 2.1504 | 4.020000e-05 |
| 16 | 2.1442 | 4.300000e-05 |
| 17 | 2.1377 | 4.660000e-05 |
| 18 | 2.1309 | 5.210000e-05 |
| 19 | 2.1236 | 6.220000e-05 |
| 20 | 2.1154 | 8.340000e-05 |
| 21 | 2.1067 | 0.000124 |
| 22 | 2.0976 | 0.000199 |
| 23 | 2.0869 | 0 |
| 24 | 2.0752 | 0 |
Optical transmission calculator
Free-standing sample in vacuum, normal incidence- Transmittance T
- —
- Reflectance R
- —
Fresnel reflection calculator
- Rp
- —
- Rs
- —
- R = (Rp+Rs)/2
- —
- Phase φp
- —
- Phase φs
- —
- Brewster angle θB
- —
- Critical angle θC
- —
TlBr40Cl60 KRS-6 has few applications. Occasionally, it is required for research purposes.
KRS-6 crystals are grown by the sealed-ampoule Stockbarger technique. Starting materials of the highest purity are selected to ensure that there are no anionic absorption bands between 2 and 16 microns and all crystals are checked for quality by using a pathlength of 120mm. Thallium salts are toxic, and KRS6 has enough solubility to require extreme caution. Careful handling with plastic gloves covered with soft cotton gloves as appropriate to delicate optics is required.
REFERENCES:
(1) Hettner and Leisegang; Optik, V3, p305, 1948
(2) Combes, Ballard, McCarthy: J.Opt Soc.Am. V41, p 215, 1951
(3) Handbook of Optical Constants, ed Palik, V3, ISBN 0-12-544423-0