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a-BBO Crystal alpha -Barium Borate

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.

  • Product Origin:

    China
  • Shipping Port:

    Fuzhou, China
  • Lead Time:

    3-4weeks
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  • Product Detail

Descriptions:

a-BBO Crystal alpha -Barium Borate (α-BaB2O4) is a negative uniaxial crystal which has large birefringence over a broad transparent range of 190nm to 3500nm. α-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.



Main applications:

1) High power Beam displacers for isolators.

2) High power Polarizer

3) Time delay compensators

Advantages:

4) High UV transmittance

5) Large birefringence

6) High damage threshold

Basice properties of YVO4 crystal:

Transparency Range

190-3500nm

Hygroscopic Susceptibility

Low

Density

3.85g/cm3

Mohs Hardness

4.5

Thermal Expansion Coefficients/℃)

9.3×10-6C

9.5×10-6A

Damage Threshold

1GW

Refractive Indices

no=1.6776ne=1.5534at 532nm

no=1.6579ne=1.5379at 1064nm

Sellmeier Equationλ in μm

no2=2.7471+0.01878/(λ2-0.01822)-0.01354λ2
ne2=2.37153+0.01224/(λ2-0.01667)-0.01516λ2


HGO offers a-BBO specifications:

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


Why Choose HGO ?

HG OPTRONICS.,INC. has the ability to supply high quality α-BBO (α-BaB2O4) in mass production quantity. Comparing with YVO4 , a-BBO crystal is more suitable for high power beam displacer for isolators and more and more isolators manufactures are looking for a-BBO as replacement of YVO4 beam displaces especially in high power system. In the past few years ,HGO has completed a mass-production line for high power a-BBO beam dispalcers and have wide experiences and strong ability to supply such crystals with large quantity and in short delivery time.

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