Refractive index of GdF₃ (Gadolinium fluoride)

import lightsmith as ls

# GdF3 (Gadolinium fluoride): Franta et al. 2023: n,k 0.120–143 µm
gdf3 = ls.fetch_refractiveindex("main", "GdF3", "Franta", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(gdf3.range_nm)  # (119.975, 142878) nm
eps = gdf3.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_1d8b933cf8e6/lightsmith"
gdf3 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(gdf3.source)  # citation and provenance travel with the data

# ... load gdf3 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=gdf3)],
    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