BGO crystals
Main features
- High electro-optic coefficient (r41= 3,5 pm/V)
- Low dark conductivity
- Large size elements or wafers up to 3”
- Customization available upon request
Application examples
- Spatial light modulators
- Optical switches
- Optical correlators
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- Description
- Properties
- Standard specifications
Bismuth germanite (Bi12GeO20, BGO) crystals are highly efficient photoconductors with a low dark conductivity, that allows a build-up of large photo-induced space-charges. Tremendous photoconductivity and electro-optic properties make BGO crystals attractive in a range of applications: spatial light modulators, optical switches, phase conjugation mixers. BGO crystals are grown by modified Czochralski method and available in up to 3‘‘ diameter aperture size.
Crystals can be supplied with ITO coatings on request.
| Main properties | |
|---|---|
| Chemical formula | Bi12GeO20 |
| Crystal structure | cubic, point group 23 |
| Lattice parameters | 10,15 Å |
| Density | 9,2 g/cm3 |
| Transmission range | 0,45-7 µm |
| Refractive index @0,63µm | 2,55 |
| Optical activity @500 nm | 41,5 deg/mm |
| Electro-optic coefficient r41 | 3,5 pm/V |
| Dielectric constant | 40 |
| Dark resistance | 1014 Ohm cm |
| BGO crystals | |
|---|---|
| Clear aperture | 85% |
| Face dimensions tolerance | +0,0/-0,2 mm |
| Thickness tolerance | ±0,2 mm |
| Parallelism error | <30 arcsec |
| Protective chamfers | <0,3 mm at 45° |
| Surface quality | 40-20 S-D |
| Wavefront distortion | <λ/[email protected],8 nm |
| Coatings | Uncoated |
| Mount | Unmounted |
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Face dimensions
Length
Orientation
SKU
PRICE
QUANTITY
5x5 mm
5 mm
[110]
6868
520 €
5x5 mm
5 mm
[100]
6871
520 €
10x10 mm
5 mm
[110]
6872
680 €
10x10 mm
5 mm
[100]
6873
680 €
20x20 mm
1 mm
[110]
6874
490 €
20x20 mm
1 mm
[100]
6875
490 €
30x30 mm
1,1 mm
[110], Edge is parallel with <001> plane ±2 deg
6876
590 €
30x30 mm
1,5 mm
[110]
6877
590 €
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