BBO

Beta-barium borate (BBO) is grown with the flux method. It is a negative uniaxial crystal, with ordinary refractive-index (n_o) larger than extraordinary refractive-index (n_e). BBO has exceptional properties that make it a very important nonlinear crystal.

SHG phase-matching range from 410 nm to 2100 nm

Transmission from 190 nm to 3500 nm

Large effective nonlinear coefficient

High damage threshold

Wide temperature-bandwidth of about 55°C

Physical and Optical Properties:
Please view NLO crysals Properities

The Sellmeier equations (l in µm):
n_o²=2.7359+0.01878/(l²-0.01822)-0.01354l²
n_e²=2.3753+0.01224/(l²-0.01667)-0.01516l²

Application
BBO is of particular importance in the visible and far UV. A wide variety of phase-matching applications are available.

Second, third, fourth and fifth harmonic generation of Nd doping lasers;

Frequency-doubling, -tripling and -mixing of Dye lasers;

Second, third and fourth harmonic generation of Ti:Sapphire lasers;

Optical parametric amplifier (OPA) and optical parametric oscillators (OPO)

Specifications

Dimension tolerance	(W ±0.1 mm) x (H ±0.1 mm) x (L ±0.2 mm)
Transmitting wavefront distortion:	l/8 @ 633 nm
Clear aperture:	> 90% central area
Flatness:	l/8 @ 633 nm
Scratch/Dig code:	10/5 to MIL-O-13830A
Parallelism:	better than 20 arc seconds
Perpendicularity:	15 arc minutes
AR coating:	R< 0.1% at 1064nm and R<0.4% at 532 nm.

Note:
1. BBO has a low susceptibility to the moisture. The user is advised to provide dry conditions for both the use and preservation of BBO.
2. BBO is relatively soft and therefore requires precautions to protect its polished surfaces.
3. When angle adjusting is necessary, keep in mind that the acceptance angle of BBO is small.