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OST Photonics Alpha BBO (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 (α-BBO) crystals are similar to those of Beta-BBO. However, there is no second order nonlinear effect in  Alpha BBO (α-BBO) crystals due to the centrosymmetry in its crystal structure and thus it has no use for second order nonlinear optical processes. Instead,  Alpha BBO (α-BBO) crystals 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 Alpha BBO (α-BBO) Crystals


  • High power Beam displacers for isolators.

  • High power Polarizer

  • Time delay compensators

 

Advantages of Alpha BBO (α-BBO) Crystals


  • High UV transmittance

  • Large birefringence

  • High damage threshold

 

Specifications of Alpha BBO (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 Alpha BBO (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
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
sales@ostphotonics.com; info@ostphotonics.com +86-0571-86780460