Beta-Barium Borate (β-BaB2O4, BBO)

Short Description:

Beta-Barium Borate (β-BaB2O4, BBO), is a nonlinear optical crystal with combination of number of unique features.


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Features

● Broad phase matchable range from 410 nm to 3500 nm;

● Wide transmission region from 190 nm to 3500 nm;

● Large effective second-harmonic-generation (SHG) coefficient about 6 times greater than that of KDP crystal;

● High damage threshold of 10 GW/cm2 for 100ps pulse-width at 1064nm;

● High optical homogeneity with dn ~10-6/cm;

● Wide temperature-bandwidth of about 55°C.

Applications

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

● Second harmonic generation to generate wavelengths as short as 204.8 nm;

● Shorter wavelengths (193nm) can be generated by sum frequency mixing;

● 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);

● Frequency-doubling of Argon ion, Cu-vapor and Ruby lasers;

● Transverse field Pockel cells made from BBO useful when high average powers or short wavelengths used.

Physical and Chemical Properties

Crystal Structure Trigonal, space group R3c
Cell Parameters a=b=12.532Å, c =12.717Å, Z=6
Melting point 1095°C
Mohs hardness 4
Density (gram/cm3) 3.85
Hygroscopic Susceptibility low
Thermal Conductivity (W/m/K) ⊥c: 1.2, ║c: 1.6
Thermal Expansion Coefficients (K-1) α11= 4 x 10-6, α33= 36 x 10-6
Resistivity (ohm • cm) > 1011
Relative Dielectric Constant εs11/ε0= 6.7, εs33/ε0= 8.1

Optical and Nonlinear Properties

Transparency Range 190-3500 nm
Phase Matching Range 409.6-3500nm
Electro-Optics Coefficients (pm/V) γ22= 2.7
Thermo-Optic Coefficients (°C-1) dno/dT= -16.6 x 10-6, dne/dT = -9.3 x 10-6

Specifications

Apertures Up to 20x20mm2
Length Up to 25mm
Dimension Tolerance (W±0.1mm) x ( H±0.1mm) x (L+0.2mm/-0.1mm)
Phase Matching Angle Tolerance Δθ< 0.25o, Δφ< 0.25o
Flatness λ/10 @ 633nm
Transmitted Wavefront Distortion < λ/8 @ 633nm
Surface Quality 10/5 scratch/dig
Parallelism < 20 arc seconds
Perpendicularity < 5 arc minutes
Clear Aperture 90% central area
Edge Bevel 0.15mm x 45°±5°chamfer
AR Coatings R < 0.2% @ 1064nm, R < 0.5% @ 532nm
Guaranteed Damage Threshold of AR Coating 500 MW/cm2for 1064nm, 10ns pulse, 10Hz

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