Refractive index of TlBr (Thallium bromide)

import lightsmith as ls

# TlBr (Thallium bromide): Palik 1985: n 0.57–39.4 µm
tlbr = ls.fetch_refractiveindex("main", "TlBr", "Palik", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(tlbr.range_nm)  # (570, 39400) nm
eps = tlbr.eps([633])  # complex permittivity

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_f2ac20c493bd/lightsmith"
tlbr = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(tlbr.source)  # citation and provenance travel with the data

# ... load tlbr as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=tlbr)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=570, stop_nm=1000, num=81),
)
res = ls.solve(sim)  # exact Mie for a sphere
print(res.q_ext)     # extinction efficiency at each wavelength

import json, urllib.request
import lightsmith as ls

url = "https://materials.lightsmith.dev/v1/datasets/ds_f2ac20c493bd/lightsmith?model=drude_lorentz"
tlbr_dl = ls.DrudeLorentz.model_validate(json.load(urllib.request.urlopen(url)))