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BSO Crystals


[001], [110]

Aperture dimensions

0.5 – 50 mm

Surface quality, S-D


Transmitted wavefront distortion, P-V

<λ/4 @ 632.8 nm

Transparency range

0.45 – 6 μm

Refractive index

2.54 at 0.633 μm

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BSO (bismuth silicon oxide) crystals are pale yellow, photoconductive electro-optic crystals. Bi12SiO20 crystals are sillenite photorefractive crystals grown using the Czochralski process and supplied in an orientation of <001> or <110>. BSO crystals are optically active and birefringent, allowing them to be used for field-induced birefringence and many other interesting applications. Both photorefractive and photoconductive effects are significant in such crystals.

BSO crystals can encode light intensity distributions as recyclable refractive index patterns in a fast and sensitive way. This makes them a very good material for electro-optic spatial light modulators. They have a wide variety of uses, including for hologram recording, Pockels readout optical memory (PROM) applications, thin-film optical waveguides, photorefraction and phase conjugation.

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Crystal Characteristics

  • Transparency range: 0.45 – 6 μm
  • Crystal symmetry: Cubic
  • Orientation: 110 cut, 100 cut
  • Density: 9.20 g/cm2
  • Refractive index: 2.54 at 0.633 μm
  • Mohs hardness: 5
  • Melting Point: 900°
  • Electrooptical coefficient: 5.0 (r41) pm/V at 0.633 μm
  • Dielectric constant (low frequency): 56

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