BGO

BGO
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BGO crystals, also known as bismuth germanate crystals, with the chemical formula Bi12GeO20, is a multifunctional optoelectronic material with high-speed photorefractive response in the visible range, as well as good piezoelectric, acousto-optic, magneto-optic, cyclotronic and electro-optic properties.
Both Bi4Ge3O12 and Bi12GeO20 crystals are abbreviated as BGO.
Bi4Ge3O12 belongs to the hexahedral body-centered structure of cubic crystal system, with space group F43m, mainly used as a scintillator; Bi12GeO20 is also a cubic body-centered structure, but with space group I23, which is mainly utilized for photorefractive and electro-optical effects, etc. As the crystal is cubic symmetric, it has good piezoelectric, magneto-optical, cyclotronic and electro-optical properties.
Because the crystal is cubic symmetry, when there is no external electric field, the crystal is optically isotropic, and the refractive index of light at wavelength 510 nm is 2.55; when there is an external electric field, the crystal shows birefringence effect.
BGO crystals have the advantages of low dark conductivity, colorless and transparent, and insoluble in water, etc. BGO can be used not only for Pukkers boxes, but also for photorefractive devices in the ultraviolet range.

Features of BGO Crystal:

  • High electro-optical coefficient
  • Low dark conductivity
  • Large size components or wafers up to 3″
  • Customized upon request

Crystal Specifications

Clear Aperture
85%
Dimensional Tolerance
 +0.0/-0.2mm
Thickness Tolerance±0.2mm
Parallelism
<30"
Chamfer
<0.3mm @45°
Surface Finish
40/20
Wavefront Distortion
<λ/4 @632.8nm
CoatingUncoated

Crystal Properties

Chemical FormulaBi12GeO20
Lattice Constant
10.15Å
Density
9.2g/cm3
Transmission Range
0.45-7μm
Refractive Index
2.55 @0.63μm
Optical Activity41.5deg/mm @500nm
Electro-optic Coefficient
r41=4.1pm/v
Dielectric Constant
40

Spectrum

electro optic crystal BGO-intensity Spectrogramelectro optic crystal BGO-transmittance -CRYLINK
BGO intensity spectrumBGO transmittance spectrum

If you are intereted in BGO, please click the button below to enquire or ask for a samplel.

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