what's β-BaB2O4 (BBO)? where's beta barium borate single crystals? how to buy nonlinear optical β-BaB2O4 (BBO) crystal?

DFNano® supplier of beta barium borate single crystals; manufacturer of nonlinear optical β-BaB2O4 (BBO) crystal in china.

what's β-BaB2O4 (BBO) crystals?

BBO is a nonlinear optical crystal with combination of number of unique features. Wide transparency and phase matching ranges, large nonlinear coefficient, high damage threshold and excellent optical homogeneity provide attractive possibilities for various nonlinear optical applications

Beta-BBO crystal, known as BBO, is one of the best non-linear optical crystals with high effective nonlinear optical coefficient, high damage threshold, wide phase matching range and high deep UV transmittance. BBO is the foremost SHG crystal for Ti:Sapphire lasers. With very good mechanical strength, BBO flakes can be as thin as 5 microns, which is ideal for ultra-short-pulse systems.

beta barium borate β-BaB2O4 (BBO) crystals parameters

beta barium borate β-BaB2O4 (BBO) crystals
Crystal Structuretrigonal, space group R3c
Cell Parametersa = b = 12.532A, c = 12.717A, Z = 6
Melting Point1095 +/-5°C
Transition Temperature925 +/-5°C
Optical HomogeneityD n ≈10 -6 /cm
Mohs Hardness4.5
Density3.85 g/cm 3
Absorption Coefficient< 0.1%/cm (at 1064 nm)
Hygroscopic Susceptibilitylow
Resistivity> 1011 ohm-cm
Relative Dielectric Constante T 11 / e 0 : 6.7, e T 33 /e 0 : 8.1 Tan d , < 0.001
hermal Expansion Coefficients(in the range of 25°C- 900°Ca, 4 x 10 -6 /K
c, 36 x 10 -6 /K
Thermal Conductivity^ c, 1.2 W/m/K; ||c, 1.6 W/m/K
Phase-matchable SHG range205nm-1750nm
NLO coefficientsd 11 = 5.8 x d36(KDP)
d 11 = 0.05 x d 11 , d 22 < 0.05 x d 11
Electro-Optic Coefficientsg 11 = 2.7 pm/V, g 22 , g 31 < 0.1 g 11
Damage Threshold
at 1.064 mm
at 0.532 mm
5 GW/cm 2 (10 ns);
10 GW/cm 2 (1.3 ns)1 GW/cm 2 (10 ns);
7 GW/cm 2 (250 ps)
Transparency Range189 - 3500 nm
Refractive Indices
at 1.0642 μm
at 0.5321 μm
at 0.2660 μm
ne = 1.5425, no = 1.6551
ne = 1.5555, no = 1.6749
ne = 1.6146, no = 1.7571
Therm-Optic Coefficientsdno /dT = - 9.3 x 10-6/℃
dne /dT = -16.6 x 10 -6 /℃
Sellmeier Equations:no2 (λ) = 2.7359+0.01878/(λ 2 -0.01822)-0.01354 λ 2
ne2 (λ) = 2.3753+0.01224/(λ 2 -0.01667)-0.01516 lλ2
Flank Size(W*H)1×1~15×15
Phase Matching Angle(θ,φ)Angel or according to customer request
Match Typetype I or type II
Angle ToleranceΔθ<±0.2°; Δφ<±0.2°
Size Tolerance(W ±0.1mm) x (H ±0.1mm) x (L +0.2mm/-0.1mm)
Flatness<λ/8 @ 633nm
Smooth Finish:20/10
Wavefront Distortion:<λ/8 @ 633nm
Clear Aperture:> 90%
CoatingP-coating or according to customer request
Total 34 beta barium borate β-BaB2O4 (BBO) crystals
For frequency conversions of ultrafast lasers, one of the main concerns is pulse broadening induced by group velocity mismatch between the input pulses and the generated pulse in an NLO crystal. In order to avoid pulse broadening, the thickness of the crystal should not exceed the maximum length as defined by the pulsewidth divided by the inversed group velocity mismatch . The table below lists the Lmax for second harmonic generation and sum frequency generation (SFG) of 10 fs pulses at the wavelength range of a Ti:Sapphire laser, the most popular ultrafast laser.

These features of nonlinear BBO crystal includes wide transparency and phase matching ranges, large non-linear coefficient, high damage threshold and excellent optical homogeneity. Therefore, BBO provides an attractive solution for various non-linear optical applications like OPO, OPA, OPCPA and other. As a result of large thermal acceptance bandwidth, high damage threshold and small absorption BBO well suits for frequency conversion of high peak or average power laser radiation. The large spectral transmission range as well as phase matching, especially in UV range, makes BBO perfectly suitable for frequency doubling of dye, Arion and Copper vapour laser radiation, effective cascade harmonic generation of wide spread Nd:YAG as well as of Ti:Sapphire and Alexandrite laser radiation.

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