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      BIBO - Bismuth Trborate
      8
      • BIBO - Bismuth Trborate

      • BIBO has a large effective nonlinear coefficient which is 3.5 - 4 times higher than that of LBO, 1.5 - 2 times higher than that of BBO. It is used top-seeded solution growth technique at CASTECH.
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      Introduction

      Bismuth Triborate (BiB3O6 or BIBO) is a newly developed nonlinear optical crystal. It possesses large effective nonlinear coefficient, high damage threshold and inertness with respect to moisture. Its nonlinear coefficient is 3.5-4 times higher than that of LBO, 1.5-2 times higher than that of BBO. It is a promising doubling crystal to produce blue laser. The top-seeded solution growth (TSSG) technique is used at CASTECH for the growth of BIBO single crystals.

       

      CASTECH offers

      •   Strict quality control;
      •   Large crystal size up to 10 × 10 × 15 mm3;
      •   AR-coating mounts and re-working services;
      •   A large quantity of crystals in stock;
      •   Fast delivery (15 days for polished only, 20 days for AR-coated).

       

      Basic Properties

      Table 1. Chemical and Structural Properties

       

      Crystal Structure Monoclinic,  Point group 2
      Lattice Parameter a = 7.116 Å, b = 4.993 Å, c = 6.508 Å, β = 105.62 °, Z = 2
      Melting Point 726 ℃
      Mohs Hardness 5-5.5
      Density 5.033 g/cm3
      Thermal Expansion Coefficients α= 4.8 × 10-5 /K, αb = 4.4 × 10-6 /K, αc = - 2.69 × 10-5 /K

       

      Sellmeier coefficients n2i (λ) = A + B / (λ- C) - D λ2 (λ in µm)
        A B C D
      n1 3.6545 (4) 0.0511 (2) 0.0371 (3) 0.0226 (1)
      n2 3.0740 (3) 0.0323 (1) 0.0316 (3) 0.01337 (6)
      n3 3.1685 (3) 0.0373 (1) 0.0346 (3) 0.01750 (8)

       

      Table 2. Optical and Nonlinear Optical Properties

       

      Transparency Range 286 - 2500 nm
      Absorption Coefficients < 0.1%/cm at 1064 nm
      Physical Axis X∥b, (Z, a) = 31.6°, (Y, c) = 47.2°
      SHG of 1064/532 nm Phase matching angle 168.9 ° from Z axis in YZ plane
      Deff 3.0 ± 0.1 pm/V
      Angular acceptance 2.32 mrad·cm
      Walk-off angle 25.6 mrad
      Temperature acceptance 2.17 ℃·cm

       

       

      BIBO's Parameters

      Table 3. Specifications

       

      Dimension Tolerance

          (W ± 0.1 mm) × (H ± 0.1 mm) × (L + 0.5/-0.1 mm) (L 2.5 mm)                              

          (W ± 0.1 mm) × (H ± 0. 1 mm ) ×  (L + 0.1/-0.1 mm)  (L2.5 mm)

      Clear Aperture  Central 90% of the diameter
      Surface Quality (Scratch/Dig) 10/5 to MIL-PRF-13830B
      Flatness ≦ λ/8 @633 nm
      Transmitted Wavefront Distortion ≦ λ/8 @633 nm
      Parallelism 20 arc sec
      Perpendicularity ≦ 15 arc min
      Angle Tolerance Δθ≦0.25 °, ΔФ≦0.25 °
      Chamfer ≦ 0.2 mm × 45°
      Chip ≦ 0.1 mm
      Damage Threshold >0.3 GW/cm2 @1064 nm, 10 ns, 10 Hz (AR-Coated)
      Quality Warranty Period One year under proper use.

       

      Coatings

      •   Dual or triple band AR-coatings of BIBO for SHG and THG applications
      •   Broad Band AR-coating (BBAR) and P-coating of BIBO for OPO applications
      •   Low reflectance
      •   Long durability
      •   Other coatings are available upon request
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