Sinoceramics | Optical Components | BSO and BGO Crystals |

BSO and BGO

Bi₁₂SiO₂₀ (BSO, Bismuth Silicate) and Bi₁₂GeO₂₀ (BGO, Bismuth Germanite) single crystals are grown by the Czochralski method. The crystals have been widely used in Photorefractive, photoconductive, electro-optic, acousto-optic applications such as two-wave mixing, four-wave mixing, phase conjugation, real-time interferometry, optical date storage, surface acoustic devices, and electro-optic devices.

Basic Properties

Crystal	Bi₁₂SiO₂₀(BSO)	Bi₁₂GeO₂₀(BGO)
Symmetry	Cubic , 23	Cubic , 23
Melting Point	900°C	930°C
Density	9.2g/cm³	9.2g/cm³
Mohs Hardness	4.5	4.5
Transparency Range	450-7500nm	70-7500nm
Transmittance @ 633nm	69%	67%
Refractive Index @ 633nm	2.54	2.55
Dielectric Constant	56	40
Electro-Optic Coefficient	r₄₁ = 5x10^-12 m/V	r₄₁ = 3x10^-12 m/V
Resistivity	5x10¹¹Ω·cm	8x10¹¹Ω·cm
Loss Tangent	0.0015	0.0035

Specifications

Polishing:	2 faces or 6 faces
Flatness:	< λ /8 @ 633nm
Wavefront Distortion:	< λ /4 @ 633nm
Parallelism:	< 30"
Surface Quality:	20/10 to MIL-O-13830A

Sinoceramics provides large sizes of BSO and BGO along with high quality. We provide as-cut and polished BSO and BGO crystals and <110> and <001> cut wafers. The size and orientation can be changed upon request by our customers.