Refractive index of AlAs-GaAs (Aluminium gallium arsenide, AlGaAs)

import lightsmith as ls

# AlAs-GaAs (Aluminium gallium arsenide, AlGaAs): Aspnes et al. 1986: n,k 0.207–0.827 µm; 31.5% Al
alas_gaas = ls.fetch_refractiveindex("other", "AlAs-GaAs", "Aspnes-31.5", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(alas_gaas.range_nm)  # (206.6, 826.6) nm
eps = alas_gaas.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_1ae7d7f6ad7c/lightsmith"
alas_gaas = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(alas_gaas.source)  # citation and provenance travel with the data

# ... load alas_gaas as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=alas_gaas)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=400, stop_nm=826, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength