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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-bibo nonlinear crystalare 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°

DimensionTolerance

±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

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

Mohs Hardness

Thermal Expansion Coefficients(/℃)

  1. (C)
  2. (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)-0.01354λ²ne²=2.37153+0.01224/(λ²-0.01667)-0.01516λ²



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