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α-BBO Crystals

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 alpha-BBO crystal are similar to those of Beta-BBO. However, there is no second order nonlinear effect in alpha-BBO crystal due to the centrosymmetry in its crystal structure and thus it has no use for second order nonlinear optical processes. Instead, alpha-BBO is widely used for fabrication of polarizers, polarizing beam displacers, phase retarders, birefringent plates, and time delay compensators especially those for UV and high power lasers.

Applications of α-BBO Crystals


  • High power Beam displacers for isolators.

  • High power Polarizer

  • Time delay compensators

 

Advantages of α-BBO Crystals


  • High UV transmittance

  • Large birefringence

  • High damage threshold

 

Specifications of α-BBO Crystals


Tolerance of cutting angle

△θ≤±0.25°,△φ≤±0.25°

Dimension Tolerance

±0.1mm

Flatness

λ/10 @ 632.8nm

Wavefront distortion

λ/4@ 632.8nm

Surface Quality

10/5 per MIL-O-13830B

Parallelism

10″

Perpendicularity

10′

Bevel/Chamfer

<0.1mm@45deg.

Chips

<0.1mm

Clear Aperture

>95%

Coating

AR/HR (IAD, EB, IBS) coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

 

Basic Properties of α-BBO Crystals


Transparency Range

190-3500nm

Hygroscopic Susceptibility

Low

Density

3.85g/cm3

Mohs Hardness

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


Related Birefringent Crystals
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Head Office: No. 66, 8 Group, Chengbei Village, Yanguan Town, Jiaxing 314411, China;

Hangzhou Branch: Room 1012, Chunhua Bussiness Center, No. 159, Hangbo Street, Shangcheng District, Hangzhou 310009, Zhejiang, China
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