• BBO
  • LBO
  • MgO:LiNbO3
  • BBO

    BBO(Beta-Barium Borate) is one of the most commonly using NLO crystal for frequency conversion and Pockels cells. It combines very wide transparency, moderately high nonlinear coupling, high damage threshold, good chemical and mechanical properties. LNG Optics offers BBO elements with High optical homogeneity and High precision, especially Highly skilled in Ultra-thin BBO elements for ultrashort pulse lasers’ SHG and THG applications. 

    Features & Standard Specifications from LNG Optics:

    Dimensions: Up to 25x25mm2

    Thickness (Length): 0.01-25mm

    Orientation angle accuracy: Δθ<0.2°Δφ<0.2°

    Flatness: λ/10 @ 633nm

    Transmitted Wavefront Distortion: λ/8 @ 633nm

    Surface Quality: 10/5 Scratch/Dig

    Clear Aperture: 90% central area

    Parallelism: 20 arc seconds

    Perpendicularity: 5 arc minutes

    Coatings: Broadband Single Layer (MgF2), Broadband AR, Single & Dual band AR Coatings. 

    Cr/Au electrode coating for Pockels cell use BBO

    Laser Damage Induced Threshold: 1GW/cm² for Polished only and Broadband Single Layer (MgF2) 

                                                            600 MW/cm² for regular AR coatings @ 1064nm, 10ns pulse, 10Hz



    Physical and Chemical Properties:

    Chemical Formula:


    Crystal Structure:

    Trigonal, Space group R3c

    Lattice Parameters (Å):

    a=b=12.532, c=12.717, Z=6

    Melting point (°C):


    Mohs hardness:


    Density (gram/cm3):


    Hygroscopic susceptibility:


    Thermal Conductivity (W/m/K):

    c: 1.2, //c: 1.6 

    Thermal Expansion Coefficients (K-1):

    α11= 4 x 10-6, α33= 36 x 10-6

    Resistivity (ohmcm):


    Relative Dielectric Constant:

    εs110 = 6.7, εs330= 8.1


    Optical and Nonlinear Properties:

    Transparency Range:


    Phase Matching Range: 

    Type I: 409.6-3500nm, Type II: 525-3500nm 

    Electro-Optics Coefficients (pm/V):

    γ22 = 2.7

    Thermo-Optic Coefficients (K-1):

    dno/dT = -16.6 x 10-6, dne/dT = -9.3 x 10-6

    Sellmeier Equations (λ in μm):

    no2 = 2.7359 + 0.01878/(λ-0.01822) - 0.01354λ2
    ne2 = 2.3753 + 0.01224/(λ-0.01667) - 0.01516λ2

    Effective Nonlinear Optical Coefficients:

    deff (I) = d31sinθ+(d11cos3φ-d22sin3φ)cosθ
    deff (II) = (d11sin3φ+ d22cos3φ)cos2θ

    Non-vanished NLO susceptibilities:

    d11=5.8 x d36(KDP), d22=d31=0.05 x d11