Optical constants
Refractive index of BD6 (LightPath)
BD6: n 2–14 µm
- Data
- tabulated n
- Range
- 2–14 µm
- Points
- 7
- Temperature
- 293 K
- Licence
- CC0-1.0
Plot
Click the plot to set the calculator wavelength.
At one wavelength
- Refractive index n
- 2.79013
- Extinction coefficient k
- 0
- Permittivity ε1
- 7.78483
- Permittivity ε2
- 0
- Absorption coefficient α
- 0 cm⁻¹
- Penetration depth δ = λ/(2πk)
- — nm
- Abbe number Vd
- —
- Chromatic dispersion dn/dλ
- -0.003 µm⁻¹
- Group index ng
- 2.806
- Group velocity dispersion
- — fs²/mm
- Dispersion parameter D
- — ps/(nm·km)
- Photon energy
- 0.234375 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
# BD6 (LightPath): BD6
lightpath_bd6 = ls.fetch_refractiveindex("specs", "LightPath-infrared", "BD6", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(lightpath_bd6.range_nm) # (2000, 14000) nm
eps = lightpath_bd6.eps([5290]) # 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_1e36d36e4670/lightsmith"
lightpath_bd6 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(lightpath_bd6.source) # citation and provenance travel with the dataAny dataset here, as the library's Tabulated material (lightpath-bd6/lightpath).
# ... load lightpath_bd6 as above, then:
sim = ls.Simulation(
particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=lightpath_bd6)],
medium_index=1.0,
wavelengths=ls.WavelengthRange(start_nm=2000, stop_nm=14000, 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
Conditions
- temperature
- 293 K
Properties
- density
- value: 4630
- thermal expansion
- value: 22.5e-06
- thermal dispersion
- type: dn/dT, value: 30.5e-6, wavelength range: 8 12
- transformation temperature
- value: 458
Thermo-optic coefficient
- dn/dT = 3.05e-05 K⁻¹
References
See also datasheet revision 2018-03-02 for more information.
Cite
BLACK DIAMOND BD6 Glass Datasheet (revision 2023-07-28); See also datasheet revision 2018-03-02 for more information.; Data from the refractiveindex.info database (M. N. Polyanskiy, Sci. Data 11, 94 (2024), doi:10.1038/s41597-023-02898-2)
Data
7 rows as published| λ (µm) | n |
|---|---|
| 2.0 | 2.82 |
| 4.0 | 2.794 |
| 6.0 | 2.788 |
| 8.0 | 2.783 |
| 10.0 | 2.778 |
| 12.0 | 2.772 |
| 14.0 | 2.764 |
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
- —
20 °C.