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  • α-BBO

  • α-BBO (α-BaB2O4) is a negative uniaxial crystal which has large birefringence over a broad transparent range of 190nm to 3500nm. α-BBO is an excellent crystal especially in UV and high power applications. The physical, chemical, thermal and optical properties of α-BBO crystal are similar to those of β-BBO. However, the nonlinear optical properties of α-BBO crystal are nonexistent due to the centric symmetry with its crystal structure. α-BBO crystal is not recommended for NLO processes.
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Advantages of α-BBO:

       •   High UV transmittance

       •   Large birefringence

       •   High damage threshold

       •   Stable physical and mechanical properties

 

Table 1. Basic Properties of α-BBO

Transparency Range

190-3500nm

Density

3.85g/cm3

Hygroscopic Susceptibility

Low

Hardness (Mohs)

4.5

Thermal Expansion Coefficients(/℃)

9.3×10-6(C)

9.5×10-6(A)

Damage Threshold

1GW

Refractive Indices

no=1.6776,ne=1.5534,at 532nm

no=1.6579,ne=1.5379,at 1064nm

Sellmeier Equation(λ in μm)

no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2
ne2=2.37153+0.01224/(λ2-0.01667)-0.01516λ2

 

Table 2. Specifications of α-BBO

Size

1mm-40mm

Surface Quality

10/5

Optical Axis Orientation

6′

Parallelism

<10″

Flatness

λ/4 @ 633nm

Clear Aperture         

>90%

Coating

AR-coating

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Upon Customer’s Specification   

 

  

 Figure 1. Transparency Curve  

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