Beta Barium Borate (b-BaB2O4 or BBO)


Introduction|Properties|Applications|Fabrication Specs.|Coating Specs.|Notes



II-A. Basic Properties

Density 3.84 g/cm3
Crystal Structure Trigonal Point group 3m, Space group R3c
Lattice Parameters a=b=12.532Å, c=12.717Å
Mohs Hardness 4.5 ~ 5
Melting Point 1095 ±5oC
Transition Temperature 925 ±5oC
Resistivity >1011ohm-cm
Optical Homogeneity Dn~10-6/cm
Absorption Coefficient <0.1%/cm @1.064 mm
Thermal Conductivity Coefficient K1 = K2 = 1.2W/m/oC; K3 = 1.6 W/m/oC
Thermal Expansion Coefficient a1=a2=4x10-6/oC, a3=36x10-6/oC
Relative Dielectric Constant e11T/e0=6.7,e33T/e0=8.1; Tand<0.001
Hygroscopisity low



II-B. Optical and NLO Properties

Transparency Region 0.19 mm ~ 3.5 mm
Phase Matching Range 0.41 mm ~ 3.5 mm
Nonlinear Coefficients (@1.064 mm)
d11=5.8xd36(KDP), d31=0.05xd11,  d22<0.05xd11
Effective SHG Coefficients
deff=d31sinq+(d11cos3f-d22sin3f)cosq

(Type I)

deff=(d11sin3f+d22cos3f)cos2q

(Type II)

(where q & f are polar angles referring to Z & X axis)
Refractive Indexes
no ne
1.6551 1.5425 (@1.064 mm)
1.6750 1.5555 (@0.532 mm)
1.7055 1.5775 (@0.355 mm)
1.7571 1.6146 (@0.266 mm)
1.8465 1.6742 (@0.213 mm)
Sellmeier Equations (l in mm)
no2=2.7359+0.01878/(l2-0.01822)-0.01354l2
ne2=2.3753+0.01224/(l2-0.01667)-0.01516l2
Therm-optic Coefficients dno/dT = -9.3 x 10-6/oC; dne/dT = -16.6 x 10-6/oC
Electro-optic Coefficients g11 = 2.7 pm/V, g31, g 22< 0.1 g11
Damage Threshold
>5GW/cm2 (10 ns), >10GW/cm2 (1.3 ns) @1.064 mm
>1GW/cm2 (10 ns), >7GW/cm2 (250 ps ) @0.532 mm

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