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* Welcome To BSO & BGO Crystal *
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BSO  BGO

 Bi12SiO20 (BSO) & Bi12GeO20 (BGO) are the most popular photorefractive crystals. Their fortunate combination of photorefractive, electrooptic and other properties makes it promising materials for optoelectronics.

 Physical Properties:

 

BSO

BGO

Crystal Symmetry

Cubic

Cubic

Density

9.20g/cm3

9.22g/cm3

Mohs Hardness

5

4.5

Melting Point

900C

925C

Transparancy Range,

0.45 - 6 mm

0.45 - 7 mm

Refractive Index at l=0.63 mm

2.54

2.55

Electrooptical Coefficient (pm/V at 0.63microns)

r41=5.0

r41=3.5

Dielectric Constant( low frequency)

56

40

 Specifications:

Wavefront distortion

less than l/8 @ 633nm

Dimension tolerance

(W 0.1mm) x (H 0.1mm) x (L + 0.2mm/-0.1mm)

Clear aperture

> 90% central area

Flatness

l/8 @ 633nm

Scratch/Dig

10/5 to MIL-O-13830A

Parallelism

better than 20 arc seconds

Perpendicularity

5 arc minutes

Angle tolerance

Dq < 0.3,D f< 0.3

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