Refractive index of AlSb-GaSb (Aluminium gallium antimonide, AlGaSb)

import lightsmith as ls

# AlSb-GaSb (Aluminium gallium antimonide, AlGaSb): Ferrini et al. 1998: n,k 0.207–2.480 µm; 50% Al
alsb_gasb = ls.fetch_refractiveindex("other", "AlSb-GaSb", "Ferrini-50", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(alsb_gasb.range_nm)  # (207, 2480) nm
eps = alsb_gasb.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_853a606d22cb/lightsmith"
alsb_gasb = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(alsb_gasb.source)  # citation and provenance travel with the data

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