Chrysoberyl

Refractive Index: 1.7408–1.7484
Abbe Number: 72.8–75.0
Crystal System: Biaxial
Formation: Natural
Dispersion Data: Measured (published fit)
Fits: 1

Refraction Fits

Fit #1— Loiko & Major 2016 (paper's γ-axis → n_α by magnitude)

Sellmeier (IR-corrected)

Valid 0.25–2.6 µm

$n_{α}$

n_{α}

= 1.7408

V_{α}

= 75.0

n_{α}^{2} = 1.7069 + \frac{1.28477 λ ^{2}}{λ ^{2} - 0.01169} - 0.0176 λ^{2}

$n_{β}$

n_{β}

= 1.7427

V_{β}

= 73.9

n_{β}^{2} = 1.78522 + \frac{1.21202 λ ^{2}}{λ ^{2} - 0.01262} - 0.01681 λ^{2}

$n_{γ}$

n_{γ}

= 1.7484

V_{γ}

= 72.8

n_{γ}^{2} = 1.58829 + \frac{1.42711 λ ^{2}}{λ ^{2} - 0.01113} - 0.01696 λ^{2}

P. Loiko & A. Major, "Dispersive properties of alexandrite and beryllium hexaaluminate crystals," Opt. Mater. Express 6, 2177–2183 (2016); fit based on J.C. Walling et al., IEEE J. Quantum Electron. 16, 1302 (1980)

Absorption Specimens

Sri Lanka, Sabaragamuwa Province, Ratnapura

LED

SUN

Chrysoberyl

Sri Lanka, Sabaragamuwa Province, Ratnapura

LED

SUN

Chrysoberyl

Sri Lanka, Sabaragamuwa Province, Ratnapura

Chrysoberyl

Refraction Fits

Fit #1— Loiko & Major 2016 (paper's γ-axis → n_α by magnitude)

nα​

nβ​

nγ​

Absorption Specimens

$n_{α}$

$n_{β}$

$n_{γ}$