a-BBO Crystal
High temperature form BBO (α -BaB2O4) are negative uniaxial crystals. They have large birefringence over a broad transparent range of 190nm to 3500nm. The physical, chemical, thermal and optical properties of α -BBO crystals are similar to those of ß -BBO. However, the nonlinear optical properties of α -BBO crystals are nonexistent due to the centric symmetry with its crystal structure. α -BBO crystals are not recommended for NLO processes.
Features:
High UV transmittance
arge birefringence
High damage threshold
Stable physical and mechanical properties
Basic Properties：
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Transparency Range
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190-3500nm
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Density
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2.7g/cm3
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Hygroscopic Susceptibility
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low
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Mohs Hardness
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4.5
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Thermal Expansion Coefficients（/CO）
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aa=9.3 X10-6/K
ac=9.3X10-6/K
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Damage Threshold
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>1GW/cm2
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Sellmeier Equation (λ in μm)
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no2 = 2.7471+0.01878/(λ2 -0.01822)-0.01354λ2
ne 2 = 2.37153+0.01224/(λ2 -0.01667)-0.01516λ
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Capabilities:
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Item
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a-BBO Crystal
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Transmission of a-BBO Crystal
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Size
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0.1-40mm
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Optical Axis Orientation
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<6 arc min
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Parallelism
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<10 arc sec
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Surface Quality
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20/10
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Flatness
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λ/ 8
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Clear Aperture
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>95%
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Coating
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Upon Customer's Specification
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