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a-BBO
Alpha-BBO Crystal
High Temperature form BBO (a-BaB2O4) is a negative uniaxial crystal. It has large birefringence over the broad transparent range from 189 nm to 3500 nm. Recently, MT-Optics has succeeded in growing this crystal into large size. The physical, chemical, thermal and optical properties of a-BBO crystal are similar to those of b-BBO. However, the nonlinear optical properties of a-BBO crystal is vanished due to the centric symmetry with its crystal structure. It is not recommended to use for NLO processes.
Specifications:
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Diameter:
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Max 50m
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Length:
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Max 35mm
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Surface Quality:
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better than 20/10 scratch/dig
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Beam Deviation:
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< 3 arc min
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Optical Axis Orientation:
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+/-0.2deg
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Flatness:
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< λ/4 @632.8nm
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Wavefront Distortion:
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< λ/2 @632.8nm
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Coating:
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Coating upon Request
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Properties:
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Transmitting range
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189nm~3500nm
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Density
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3.85g/cm3
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Therm-Optic Coefficients
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dno/dT=-9.3 x 10-6/ °C
dno/dT=-16.6x10-6/ °C |
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Optical Homogeneity
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Δn≈10-6/cm
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Mohs Hardness
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4.5
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Damage Threshold
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1GW/cm2 at 1064nm
500MW/cm2 at 532nm |
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Hygroscopic Susceptibility
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Low
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Thermal Expansion Coefficients
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αa=4x10-6
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(25 °C - 900 °C)
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αa=4x10-6
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Linear Absorption Coefficients
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a<0.005cm-1 from 300nm to 2300nm
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Refractive Indices,
Birefringence(△n=ne-no) and wal-off Angle at 45 °C(ρ) |
ne=1.58462,no=1.65790,n=-0.073282;ρ=-4.9532° at 1064nm
ne=1.60206,no=1.67755,n=-0.075491;ρ=-5.0407° at 532nm ne=1.67190,no=1.76171,n=-0.089805;ρ=-5.6926° at 266nm |
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Sellmeier equation(l in μm)
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no2=2.7471+0.01878/( λ2-0.01822)-0.01354 λ2
ne2=2.37153+0.01224/( λ2-0.01667)-0.01516 λ2 |
Note: Kinds of sizes, cut angle, coating are available upon request.
