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Alpha-BBO Crystals

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Alpha-BBO Crystals
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Diameter: Max 50m

Length: Max 35mm

Surface Quality: better than 20/10 scratch/dig

Beam Deviation: < 3 arc min

Optical Axis Orientation: +/-0.2deg

Flatness: < λ/4 @632.8nm

Wavefront Distortion: < λ/2 @632.8nm

Coating: Coating upon Request


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Product Features

 

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. 

01

Recently, CryLight 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.

02

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.

Product parameters

Properties:


Transmitting range

189nm~3500nm

Density

3.85g/cm3

Therm-Optic Coefficients

dno/dT=-9.3 x 10-6/ °C

dno/dT=-16.6x10-6/ °C

Optical Homogeneity

△n»10-6/cm

Mohs Hardness

4.5

Damage Threshold

1GW/cm2 at 1064nm

500MW/cm2 at 532nm

Hygroscopic Susceptibility

Low

Thermal Expansion Coefficients

aa=4x10-6

(25 °C - 900 °C)

aa=4x10-6

Linear Absorption Coefficients

a<0.125px-1 from 300nm to 2300nm

Refractive Indices,

ne=1.58462,no=1.65790,△n=-0.073282;r=-4.9532° at 1064nm

Birefringence(Dn=ne-no) 

ne=1.60206,no=1.67755,△n=-0.075491;r=-5.0407° at 532nm

and wal-off Angle at 45 °C(r)

ne=1.67190,no=1.76171,△n=-0.089805;r=-5.6926° at 266nm

Sellmeier equation(l in mm)

no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2 

ne2=2.3174+0.01224/(λ2-0.01667)-0.01516λ2


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