Go back


BBO (Beta-Barium Borate) is an excellent nonlinear crystal with combination of a number of unique features: wide transparency region, broad phase-matching range, large nonlinear coefficient, high damage threshold. BBO is very suitable for the second, third and fourth harmonic generation of Nd:YAG lasers, and the best NLO crystal for the fifth harmonic generation at 213nm. Good laser beam quality (small divergence, good mode condition, etc.) is the key for BBO to obtain high conversion efficiency.

Technical Data [BBO]
Dimension Tolerance ± 0.1 mm
Angle Tolerance < ± 0.25°
Flatness < λ/8 @ 633 nm
Surface Quality < 10/5 [S/D]
Parallelism < 20”
Perpendicularity ≤ 5'
Chamfer ≤ 0.2mm @ 45°
Chip ≤ 0.1mm
Wavefront Distortion < λ/8 @ 633 nm
Clear Aperture > 90% central area
Coating AR coating @ 1064nm (R<0.2%)
Laser Damage Threshold > 1 GW/cm2 for 1064nm, 10ns, 10Hz (polished only)
> 0.5 GW/cm2 for 1064nm, 10ns, 10Hz (AR-coated)
> 0.3 GW/cm2 for 532nm, 10ns, 10Hz (AR-coated)