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Crystals NLO Crystals BBO

Beta-barium borate (BBO) has the following exceptional properties that make it a very important nonlinear crystal, BBO is grown with the flux method. It is a negative uniaxial crystal, with ordinary refractive-index (no) larger than extraordinary refractive-index (ne).

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 Chemical Properties:

Please view NLO crysals physical Properities (dpf format)

The Sellmeier equations (l in µm ):


Optical and Spectral Properties:

Please view NLO crysals optical and nonlinear optical Properities (dpf format)


BBO is of particular importance in the visible and far UV. A wide variety of phase-matching applications are possible, including the following:

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);

BBO’s 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
Angle tolerance: Dq < ±0.3°, Df < ± 0.3°
AR coating: R< 0.1% at 1064nm and R<0.4% at 532 nm.
Quality Warranty Period: one year under proper use.


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.

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