OST Photonics ?-BBO Crystals

?-BBO ?-BaB2O4 is a negative uniaxial crystal which has large birefringence over a broad transparent range of 190nm to 3500nm. ?-BBO is an excellent crystal especially in UV and high power applications.



The physical, chemical, thermal, and optical properties of alpha-BBO crystal are similar to those of Beta-BBO. However, there is no second order nonlinear effect in alpha-bbo nonlinear crystal due to the centrosymmetry in its crystal structure and thus it has no use for second order nonlinear optical processes. Instead, alpha-BBO is widely used for fabrication of polarizers, polarizing beam displacers, phase retarders, birefringent plates, and time delay compensators especially those for UV and high power lasers.



Applications of ?-BBO Crystals





High power Beam displacers for isolators.



High power Polarizer



Time delay compensators

 

Advantages of ?-BBO Crystals



High UV transmittance



Large birefringence



High damage threshold



Specifications of ?-BBO Crystals



Tolerance of cutting angle ???±0.25°,???±0.25°

Dimension Tolerance ±0.1mm

Flatness ?/10 @ 632.8nm

Wavefront distortion ?/4@ 632.8nm

Surface Quality 10/5 per MIL-O-13830B

Parallelism 10?

Perpendicularity 10?

Bevel/Chamfer 95%

Coating AR/HR IAD, EB, IBS coating upon customer’s request

Damage Threshold 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period One year under proper use

 

Basic Properties of ?-BBO Crystals



Transparency Range 190-3500nm

Hygroscopic Susceptibility Low

Density 3.85g/cm3

Mohs Hardness 4.5

Thermal Expansion Coefficients?/?? 9.3×10^-6?C?

9.5×10^-6?A?

Damage Threshold 1GW

Refractive Indices no1.6776?ne1.5534?at 532nm

no1.6579?ne1.5379?at 1064nm

Sellmeier Equation?? in ?m? no²2.7471 0.01878/?²-0.01822-0.01354?²

ne²2.37153 0.01224/?²-0.01667-0.01516?²



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