BBO is an outstanding crystal for many applications in nonlinear optics and electro-optics. BBO is a colorless trigonal uniaxial crystal with low hygroscopic susceptibility. Its transparency range is from 0.19μm to 3.5μm.
BBO is an efficient nonlinear crystal for second, third, fourth and fifth harmonic generators of Nd: Laser, dye lasers and ultrafast Ti:Sapphire lasers. It has also excellent performance in optical parametric amplifier, oscillators, etc.
BBO typical orientations
►θ≠0°, φ=0°, For Type I phase matching application.
►θ≠0°, φ=30°, For Type II phase matching application.
►Brewster cut,θ≠0°, φ=0°, or 30°, no coating on S1&S2.
►Z-cut, gold coated on X-faces, for Q-switch application.
Phase matching angle: θ and φ
q and f are depended on different applications of frequency conversion.
If you're not sure to calculate the phase matching angles, please contact us for assistance.
Protective coating is required to prevent polished surfaces from fogging.
Anti-reflective coating should be considered if low reflectivity is required.
Ultra thin BBO Plate
The minimum thickness of BBO we can polish is 0.005mm, the ultra thin BBO is used for frequency conversion of ultra fast laser with femtosecond pulse width.
For frequency conversion of ultrafast lasers such as Ti:sapphire and Dye laser with femtosecond pulse width.
The main concern is fs pulse broadening induced by group velocity mismatching(GVM) or group velocity dispersion. The suggested thickness of BBO crystals is less than pulse width divides.
Phase matching angle
θ and φ are depended on different applications of frequency conversion. The familiar phase matching angles are listed below: