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α-BBO - Alpha-Barium Borate
α-BBO - Alpha-Barium Borate
α-BBO
3
  • α-BBO - Alpha-Barium Borate

  • α-BBO has a broad transparent range of 190 nm-3500 nm and high birefringence, and is widely used as Glan prisms and polarizing beam splitters for its high extinction ratio and UV transmission.
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Introduction 

Alpha-Barium Borate (α-BaB2O4, α-BBO) is a negative uniaxial crystal which has large birefringence over a broad transparent range of 190 nm-3500 nm. α-BBO is an excellent crystal especially in UV and high power applications. The physical, chemical, thermal and optical properties of α-BBO crystal are similar to those of β-BBO. However, the nonlinear optical properties of α-BBO crystal are nonexistent due to the centrical symmetry of its crystal structure. α-BBO crystal is recommended for NLO processes. 

 

 

CASTECH's birefringent crystal α-BBO  is featured by

  • High UV transmittance
  • Large birefringence
  • Low bulk absorption suitable for high power applications
  • High damage threshold
  • Stable physical and mechanical properties

 

Table 1. Basic Properties

Crystal Structure

Trigonal

Transparency Range

190-3500 nm

Density

3.85 g/cm3

Hygroscopic Susceptibility

Low

Hardness  

4.5 Mohs

Thermal Expansion Coefficients

-9.3 × 10-6 /℃(C)-9.5 × 10-6 /℃(A)

Damage Threshold

1 GW/cm2 @1064 nm, 10 ns, 10 Hz (AR-coated) 

Refractive Indices

no = 1.6776, ne = 1.5534, @532 nmno = 1.6579, ne = 1.5379, @1064 nm

Sellmeier Equation (λ in μm)

no2 = 2.7471 + 0.01878 / (λ2 - 0.01822) - 0.01354 λ2ne2 = 2.37153 + 0.01224 / (λ2 - 0.01667) - 0.01516 λ2

 

Table 2. Specifications of α-BBO

Size

Aperture up to Φ50 mm and length up to 40 mm

Surface Quality

10/5 to MIL-PRF-13830B

Flatness

λ/4 @633 nm

Optical Axis Orientation

6 arc min

Parallelism

20 arc sec

Clear Aperture

> 90%

Coating

AR-coating or P-coating

Mount

Upon Customer's Specification

  

 Figure 1. Transparency Curve  

 

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