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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

    Mount

    Upon Customer’s Specification   

     

      

     Figure 1. Transparency Curve  

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