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

Item	a-BBO Crystal	Transmission of a-BBO Crystal
Size	0.1-40mm
Optical Axis Orientation	<6 arc min
Parallelism	<10 arc sec
Surface Quality	20/10
Flatness	λ/8
Clear Aperture	>95%
Coating	Upon Customer's Specification