BBO

Beta-Barium Borate (β-BaB2O4) is a crystal with significant advantages and excellent performance, including an extremely wide transmission range, a large phase-matching angle, a high resistance to optical damage threshold, broad temperature matching, and excellent optical homogeneity.

Classification:

Nonlinear Crystals

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Detailed introduction

Product features

High nonlinear optical coefficient

Wide transmission range, suitable for high power laser systems

Good optical uniformity and mechanical strength

Excellent thermal properties

High damage threshold

Specifications
Dimensional Tolerance	(W±0.1mm)×(H±0.1mm)×(L±0.2mm)
Angle Tolerance	Δθ＜0.25°, Δφ＜0.25°
Parallelism	＜20″
Perpendicularity	＜5′
Clear Aperture	≥Central 95% of the diameter
Surface Quality	10/5 (MIL-PRF-13830B)
Flatness	λ/10 @633nm
Wavefront Distortion	＜λ/8 @633nm

Crystal Chemistry and Structural Characteristics
Crystal structure	Orthorhombic
Lattice parameters	a=12.532Å, b=6.71Å, c=10.864Å
Melting point	1090℃
Mohs hardness	4.5
Density	3.85 g/cm³
Thermal conductivity	10W/(m·K)
Thermal expansion coefficient	a:4.4×10^-6/K, b:3.5×10^-6/K, c:9.3×10^-6/K

Characteristic Parameters
Transmittance	＞95%(1064nm)
Optical uniformity	＜0.1%
Temperature stability	＜10^-6/K
Nonlinear optical coefficient	d11=2.2, d31=2.8, d22=0.5, d33=13.5
Thermal coefficient	dn/dT=10^-5/K
Refractive index	no=1.655, ne=1.542(1064nm)
Nonlinear Coefficien(pm/v)	2.45(SHG), 2.20(THG)
Effective SHG coefficient (SHG, THG)	1.4(SHG), 0.8(THG)
Walk-off Angle (mrad·cm)	29.4(type I), 47.2(type II)
Acceptance Angle (mrad·cm)	18.5(type I), 24.7(type II)
Phase Matching Range (℃m)	266~291(SHG), 500~740(THG)
Temperature Acceptance (℃)	55(SHG), 30(THG)
Damage Threshold(GW/cm2)	~1(SHG), ~0.3(THG)