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BBO
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Beta-Barium Borate,β-BaB2O4,BBO
The main advantages of BBO: 
? Broad phase matching second-harmonic-generation (SHG) range from 409.6nm to 3500nm 
? Wide transmission region from 190nm to 3500nm 
? Large effective SHG coefficient 
? High damage threshold of 10 GW/cm2 for 100 ps pulse-widths at 1064nm 
? High optical homogeneity with Dn 10-6/cm2 
? Wide temperature bandwidth of about 55° (for type I SHG 1064nm) 
? Good mechanical and physical properties 
 

The main application of BBO crystals:


? Second, third, fourth and fifth harmonic generation of Nd:YAG
? Frequency-doubling, -tripling and -mixing of dye lasers 
? Optical parametric amplifiers (OPA) and optical parametric oscillators (OPO) 
? Second, third, fourth and fifth harmonic generation of Ti: sapphire and alexandrite 
? Frequency-doubling of Argon ions, Cu vapor and ruby lasers 
? External intra-cavity SHG

HG provides:

? The most advanced technical support
? The most competitive price and quality discounts
? Adequate stock
? Quick delivery within 2 weeks

The main properties of BBO crystals：

BBO is a negative uniaxial crystal, and its o-ray refractive coefficient (no) is higher than that of the e-ray (ne) which can be calculated by Selleimer equation (λ in μm):
no2 = 2.7359 +0.01878 / (λ2-0.01822) -0.01354 λ2 
ne2 = 2.3753 +0.01224 / (λ2-0.01667) -0.01516 λ2

BBO crystal in the Nd:YAG lasers:

BBO is an efficient NLO crystal for the second, third and fourth harmonic generation of Nd:YAG lasers, and the best NLO crystal for the fifth harmonic generation at 213nm. Conversion efficiency more than 70% for SHG, 60% for THG, 50% for 4HG, and 200mw output at 213nm have been obtained, respectively. Besides, BBO is also an efficient crystal for the intra- cavity SHG of high power Nd:YAG lasers.

HG’s warranty on BBO specification:

* Wavefront distortion: less than λ / 8 @ 633nm 
* Dimension tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L ± 0.2mm/-0.1mm) 
* Aperture:> 90% central diameter 
* Flatness: λ / 8 @ 633nm 
* Finish: 10 / 5 to MIL-PRF-13830B 
* Parallelism: better than 20 seconds 
* Verticality: 5 minutes 
* Angle deviation: △ θ ≤ ± 0.25 °, △ φ ≤ ± 0.25 ° 
* Quality guarantee period: one year of normal use