BBO Crystal

Posted by Ningliu on May 13th, 2017

The BBO Crystal 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 213 nm. Conversion efficiencies of more than 70% for SHG, 60% for THG and 50% for 4HG, and 200 mW output at 213 nm (5HG) have been obtained, respectively. BBO Crystal has the following.

Advantages of BBO Crystal

• Broad phase-matching range from 409.6 nm to 3500 nm
• Wide optical transmission from 190 nm to 3500 nm
• Large effective second-harmonic-generation (SHG) coefficient
• High damage threshold of 10 GW/cm2 for 100 ps pulse-width at 1064 nm
• Wide temperature-bandwidth of about 55℃
• Good mechinical and physical properties

Specifications

Aperture: 2x2 ~ 25x25mm

Lenght: 0.01 - 25mm

Cutting Angle of BBO Crystal q and f: Determined by different kinds of homonic generartion

Phase matching type: Type I or Type II

End Configuration: Plano/Plano or Brewst/Brewst or Specified

Specifications of BBO Crystal

Angle tolerance: Δθ< ± 0.5°; Δφ< ±0.5°

Dimensional Tolerance: (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm)

Flatness: <λ/8 at 633nm

Surface Quality: 10/5 S/D

Parallelism: < 20 arc seconds

Perpendicularity: < 5 arc minutes

Wavefront Distortion: <λ/8 at 632.8nm

Clear Aperture: Central 95%

Chamfer: 0.15x45°

Coating: * Protective coating is required to prevent polished surfaces from fogging.

* Anti-reflective coating should be considered if low reflectivity is required.