BBO Nonlinear Crystals
β-Barium borate (β-BaB2O4 or BBO) is a nonlinear optical crystal which combines a number of unique features. These features include broad transmission and phase matching ranges, large nonlinear coefficient, high damage threshold, high quality single crystals and excellent optical homogeneity.
β-Barium borate (β-BaB2O4 or BBO) is a nonlinear optical crystal which combines a number of unique features. These features include broad transmission and phase matching ranges, large nonlinear coefficient, high damage threshold, high quality single crystals and excellent optical homogeneity. Therefore, Beta-BaB2O4 provides an attractive solutions for various nonlinear optical applications. Besides, BBO is one of the best candidates for electro-optical applications due to its excellent electro-optical properties.
BBO crystals have been widely used in non-linear optical applications like OPO, OPA, OPCPA and other. Thanks to its large spectral transmission range as well as phase matching, BBO crystals have been applied in second, third, fourth or fifth harmonic generations for high power visible/UV sources and optical parametric conversions for high power broadly tunable sources. Since its broad gain bandwidth overlaps with Ti:Sapphire in 800 nm range, ultra-high power and high contrast laser systems have been built based on the mixed CPA/OPCPA plan.
Wide transmission region from 190 nm to 3500nm
Large effective second-harmonic-generation (SHG) coefficient
Good mechanical and physical properties
High damage threshold of 10 J/cm2 for 100 ps pulse-width at 1064 nm
Broad phase-matching range from 409.6 nm to 3500nm
Wide temperature-bandwidth of about 55℃
High optical homogeneity with δn≈10-6/cm
Harmonic generations (up to fifth) of Nd doped lasers
Frequency doubling and tripling of ultrashort Ti:Sapphire and Dye lasers
Frequency doubling of Argon ion and Copper vapour laser radiation
Optical parametric oscillators (OPO) at both Type 1(ooe) and Type 2 (eoe) phase-matching
Electro-optic crystal for Pockels cells
Ultrashot pulse duration measurements by autocorrelation
Chemical and Physical Properties
1.2 W/m/K (⊥c); 1.6 W/m/K (//c)
Thermal expansion coefficient
Linear Optical Properties
189 - 3500 nm
at 1.0642 mm
at 0.5321 mm
at 0.2660 mm
ne = 1.5425, no = 1.6551
ne = 1.5555, no = 1.6749
ne = 1.6146, no = 1.7571
Sellmeier Equations(λ in μm)
no2(λ) = 2.7359+0.01878/(λ2-0.01822)-0.01354λ2
ne2(λ) = 2.3753+0.01224/(λ2-0.01667)-0.01516λ2
Nonlinear Optical Properties
SHG Phase Matchable Range
409.6 ∼ 3500nm (Type I); 525 ∼ 3500nm (TypeII)
d11= 5.8 x d36(KDP);d31 = 0.05 x d11; d22< 0.05 x d11
deff(I)=d31sinϴ + (d11cos3φ - d22sin3φ)cosϴ
dno/dT = - 9.3 x 10-6/◦C
dne/dT = -16.6 x 10-6/◦C
g11= 2.7 pm/V, g22, g31< 0.1 g11
48 KV (at 1064 nm)
at 1.064 mm
at 0.532 mm
5 GW/cm2 (10 ns); 10 GW/cm2 (1.3 ns)
1 GW/cm2 (10 ns); 7 GW/cm2 (250 ps)
Figure 2. SHG tuning curves of BBO
Figure 3. OPO tuning curves of BBO (TypeI (ooe))with different pump light, namely 530 nm, 355 nm and 266 nm
Figure 4. OPO tuning curves of BBO (TypeII (eoe))with different pump light, namely 530 nm, 355 nm and 266 nm
PP Coatings S1/S2 nm/nm
Q: What is phase mismatching?
A: A group of techniques for achieving efficient nonlinear interactions in a medium. Many phase-sensitive nonlinear processes, in particular parametric processes such as frequency doubling, sum and difference frequency generation, parametric amplification and oscillation, and also four-wave mixing, require phase matching to be efficient. Essentially, this means ensuring that a proper phase relationship between the interacting waves (for optimum nonlinear frequency conversion) is maintained along the propagation direction. Only if that condition is fulfilled, amplitude contributions from different locations to the product wave are all in phase at the end of the nonlinear crystal.
Q: What is Second harmonic generation (SHG)?
A: SHG is a nonlinear optical process, in which photons with the same frequency interacting with a nonlinear material are effectively "combined" to generate new photons with twice the energy, and therefore twice the frequency and half the wavelength of the initial photons.
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