Description
Barium borate (-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.
Features
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 n≈10-6/cm
Applications
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
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Property
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Value
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Chemicalformula
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BaB2O4
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Crystalstructure
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trigonal,3m
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LatticeParameter
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a=b=12.532,c=12.717, Z=6
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Massdensity
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3.85 g/cm3
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Mohhardness
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4
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Meltingpoint
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About1095°C
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Thermalconductivity
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1.2W/m/K (⊥c); 1.6 W/m/K (//c)
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Thermalexpansion coefficient
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,4x10-6/K;c,36x10-6/K
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Birefringence
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negativeuniaxial
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Linear Optical Properties
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Property
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Value
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TransparencyRange
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189- 3500 nm
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AbsorptionCoefficient:
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<0.1%/cm@1064nm
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RefractiveIndices
at1.0642 mm
at0.5321 mm
at0.2660 mm
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ne= 1.5425, no = 1.6551
ne= 1.5555, no = 1.6749
ne= 1.6146, no = 1.7571
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SellmeierEquations( in m)
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no2() = 2.7359+0.01878/(2-0.01822)-0.013542
ne2() = 2.3753+0.01224/(2-0.01667)-0.015162
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Nonlinear Optical Properties
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Property
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Value
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SHGPhase Matchable Range
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409.63500nm (Type I); 525 3500nm (TypeII)
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NLOcoefficients
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d11= 5.8 x d36(KDP);d31 = 0.05 x d11; d22
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