BK7 (Schott)

Glasses, oxides and dielectrics

1 dataset, together covering 5–33.33 µm. Default: Lane 1990: n,k 5.00–33.3 µm.

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Tick datasets in the list to add them to the plot (up to 12).

Datasets

Lane 1990: n,k 5.00–33.3 µm n,k 5–33.33 µm default

Use it in Lightsmith

Load this data in Python, simulate in one more line

pip install lightsmith

import lightsmith as ls

# BK7 (Schott): Lane 1990: n,k 5.00–33.3 µm
bk7 = ls.fetch_refractiveindex("glass", "BK7-Schott", "Lane", ref="c5c2f188e848453def5970e347399d653df2ffc2")
print(bk7.range_nm)  # (5000, 33333) nm
eps = bk7.eps([12900])  # 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_daf1888de9bd/lightsmith"
bk7 = ls.Tabulated.model_validate(json.load(urllib.request.urlopen(url)))
print(bk7.source)  # citation and provenance travel with the data

Any dataset here, as the library's Tabulated material (bk7-schott/lane-1990).

# ... load bk7 as above, then:
sim = ls.Simulation(
    particles=[ls.Particle(shape=ls.Sphere(radius_nm=50), material=bk7)],
    medium_index=1.0,
    wavelengths=ls.WavelengthRange(start_nm=5000, stop_nm=33330, 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"]).

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 BK7 (Schott)

BK7 is a widely used optical glass known for its high transmission and clear, colorless appearance. Composed primarily of silica and boron oxide, BK7 is popular in a broad range of optical applications, including lenses, prisms, and windows. It exhibits good mechanical properties and can be easily polished to a high optical quality. While it is not as resistant to thermal shock or chemical corrosion as some specialized glasses like borosilicate or fused silica, it is considerably less expensive, making it a cost-effective choice for many applications. Its relatively high refractive index and low dispersion make it suitable for a variety of optical systems, particularly those operating in the visible spectrum. Because of its versatility and cost-effectiveness, BK7 is often considered the "go-to" material for general-purpose optical components. Analogs of BK7 glass produced by different makers: Maker Glass SCHOTT N-BK7 OHARA S-BSL7 HIKARI J-BK7A CDGM H-K9L HOYA BSC7 SUMITA K-BK7 LZOS K8

Other names: BK7, Schott, BSL7, K9L, BSC7

Crown glass - Wikipedia

API: /v1/materials/mat_c4ba983b6093 · slug bk7-schott