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BBO Crystal

  • Introduction

BBO Crystal


The BBO Crystal is a high-temperature phase of BaB2O4, is an excellent birefringent crystal 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 been widely used in 2,3,4 or 5 harmonic generations for high power visible/UV sources, and optical parametric conversions for high power broadly tunable sources.


Advantages of BBO Crystals


  • Broad phase-matching range from 409.6 nm to 3500 nm
  • Extensive 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℃
  • Excellent mechanical and physical properties


Specifications

Aperture: 2x2 ~ 25x25mm

Lenght: 0.01 - 25mm

Cutting Angle of BBO Crystal q and f: Determined by different kinds of harmonic generation

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.


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