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![[ Castech ]<Br>BIBO - Bismuth Trborate<br>Nonlinear Crystal](/thum_img/mjct/goods_img3/71205a913267bdeebca67c57546edce7_water_4de0b559c44a49f5f544fca08f3bc282_c0_w500_h500.jpg)
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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 | αa = 4.8 × 10-5 /K, αb = 4.4 × 10-6 /K, αc = - 2.69 × 10-5 /K |
| Sellmeier coefficients | n2i (λ) = A + B / (λ2 - 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) (L＜2.5 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
