KF (Potassium fluoride)

Glasses, oxides and dielectrics

1 dataset, together covering 0.15–22 µm. Default: Li 1976: n 0.15–22 µm.

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Datasets

Li 1976: n 0.15–22 µm n 0.15–22 µm default

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# KF (Potassium fluoride): Li 1976: n 0.15–22 µm
kf = ls.fetch_refractiveindex("main", "KF", "Li", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(kf.range_nm)  # (150, 22000) nm
eps = kf.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_d1602b7fab70/lightsmith"
kf = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(kf.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (kf/li-1976).

# ... load kf as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=kf)],
    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_d1602b7fab70/lightsmith?model=drude_lorentz"
kf_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.

About KF (Potassium fluoride)

Potassium fluoride (KF) is a crystalline material with particular usefulness in optical applications. It exhibits good transmission properties in the ultraviolet to the mid-infrared spectral regions. Unlike potassium chloride or bromide, it offers better moisture resistance, making it more versatile for use in environmental conditions that include some humidity. Frequently, KF is employed in windows and lenses for specialized optical systems, particularly those operating in the ultraviolet range. However, users should still exercise caution while handling it, as potassium fluoride can be corrosive. Overall, its combination of optical and chemical properties makes it a valuable material in various optical applications.

Other names: Potassium fluoride, Potassium(I) fluoride

API: /v1/materials/mat_e3534069919d · slug kf