Barium Borate Crystal | BBO Crystal

Data sheet

Density	3.85 g/cm³
Materials	BBO
Melting Piont	1095 ℃
Molecular Formula	β-BaB2O4

More info

Barium Borate (BBO) Crystal has a broad transmission range from 188 nm to 5.2 μm, with optimal performance between 3 μm and 5.2 μm. Even at thicknesses of several tens of micrometers, it maintains excellent transmission and phase matching. BBO is widely used in nonlinear applications, such as harmonic generation, frequency doubling for Nd-doped lasers, Ti: sapphire laser tripling, and tunable OPOs. It is recognized for having the highest nonlinear optical performance among UV nonlinear crystals.

Barium Borate Crystal | BBO Crystal

Barium Borate Crystal Specifications

Dimension Tolerance	(W±0.1 mm) × (H±0.1 mm) × (L+0.5/-0.1 mm) (L≥2.5 mm)
Dimension Tolerance	(W±0.1 mm) × (H±0.1 mm) × (L+0.1/-0.1 mm) (L＜2.5 mm)
Effective Clear Aperture	90% Central Area
Internal Quality	50 mW green light test, no visible scattering path or center
Surface Quality	10/5 per MIL-PRF-13830B standard
Flatness	≤λ/8 @ 633 nm
Transmitted Wavefront Distortion	≤λ/8 @ 633 nm
Parallelism	20″
Perpendicularity	15′
Angle Tolerance	≦0.25°
Chamfer	≦0.2 mm×45°
Edge Chipping	≦0.1 mm
Damage Threshold	＞1.5 GW/cm² @ 1064 nm, 10 ns, 10 Hz (Polished)
	＞1 GW/cm² @ 1064 nm, 10 ns, 10 Hz (AR Coated)
	＞0.3 GW/cm² @ 532 nm, 10 ns, 10 Hz (AR Coated)

Barium Borate Crystal Stock Specifications

Dimensions (mm)	Length (mm)	Theta	Phi	Coating	Application
6x6	0.1, 0.5, 1	29.2°	90°	P/P@400-800nm	SHG@800nm, Type I
10x10	0.1, 0.5, 1	29.2°	90°	P/P@400-800nm	SHG@800nm, Type I
6x6	0.1, 0.5, 1	44.3°	90°	P/P@400-800/266 nm	THG@800nm, Type I
10x10	0.1, 0.5, 1	44.3°	90°	P/P@400-800/266 nm	THG@800nm, Type I
6x6	0.15, 0.25, 0.55	32.5°	90°	AR/Ar@1030+515/343 nm	THG@1030nm, Type I
10x10	0.5, 1	23.4°	90°	AR/Ar@515+1030 nm	SHG@1030nm, Type I

Barium Borate Crystal Chemical and Structural Properties

Chemical Formula	β-BaB2O4
Crystal Structure	Trigonal system, space group R3c
Unit Cell Parameters	a=b=12.532 Å, c=12.717 Å, Z=6
Melting Point	~1095 °C
Mohs Hardness	4 Mohs
Density	3.85 g/cm³
Thermal Conductivity	1.2 W/m/K (⊥c); 1.6 W/m/K (∥c)
Thermal Expansion Coefficient	α₁₁=4×10⁻⁶ /K, α₃₃=36×10⁻⁶ /K

Barium Borate Crystal Optical and Nonlinear Optical Properties

Transparency Range	190-3500 nm
SHG Phase Matching Range	409.6-3500 nm (Type Ⅰ), 525-3500 nm (Type Ⅱ)
Thermo-Optic Coefficient	dno/dT=-16.6×10⁻⁶ /°C, dne/dT=-9.3×10⁻⁶ /°C
Absorption Coefficient	＜0.1%/cm @ 1064 nm, ＜1%/cm @ 532 nm
Acceptance Angle	0.8 mrad·cm (θ, TypeⅠ, 1064 SHG) 1.27 mrad·cm (θ, TypeⅡ, 1064 SHG)
Temperature Bandwidth	55 °C·cm
Spectral Acceptance Bandwidth	1.1 nm·cm
Walk-off Angle	2.7° (TypeⅠ, 1064 SHG) 3.2° (TypeⅡ, 1064 SHG)
Nonlinear Optical Coefficient	deff（Ⅰ）=d₃₁sinθ+（d₁₁cos3Ф-d₂₂sin3Ф）cosθ deff（Ⅱ）=（d₁₁sin3Ф+d₂₂cos3Ф）cos2θ
Non-Zero Nonlinear Optical Coefficients	d₁₁=5.8×d₃₆（KDP）=2.55 pm/V d₃₁=0.05×d₁₁ d₂₂＜0.05×d₁₁
Sellmeier Equation	no² = 2.7359 + 0.01878 / (λ² - 0.01822) - 0.01354 λ² ne² = 2.3753 + 0.01224 / (λ² - 0.01667) - 0.01516 λ²
Electro-Optic Coefficient	γ₂₂=2.7 pm/V
Half-Wave Voltage	7 KV (@ 1064 nm, 3×3×20 mm³)
Resistivity	˃10¹¹ ohm•cm
Relative Dielectric Constant	ɛs₁₁/ɛ₀: 6.7 ɛs₃₃/ɛ₀: 8.1 Tanδ＜0.001

Barium Borate Crystal Transmittance Curve

Barium Borate Crystal Tuning Curve

BBO is a negative uniaxial crystal, meaning its ordinary refractive index (no) is greater than its extraordinary refractive index (ne). By angle tuning, both Type I and Type II phase matching can be achieved. The SHG (Second Harmonic Generation) phase matching is shown in the figure below:

Barium Borate Crystal Tuning Curve

Barium Borate Crystal Key Advantages

Wide phase-matching range (409.6-3500 nm)
Wide transparency range (190-3500 nm)
High second harmonic generation (SHG) conversion efficiency (6 times that of KDP crystal)
High damage threshold
Good optical uniformity (δn≈10⁻⁶ /cm)
Wide temperature acceptance angle (~55 °C)
Used for second, third, fourth, and fifth harmonics of Nd: YAG lasers
Widely used in harmonic generation of ultrafast lasers

Barium Borate Crystal Applications

Nd: YAG Lasers: Efficient in second to fifth harmonics. High conversion efficiencies (e.g., >70% for the second harmonic).
Dye Lasers: High SHG efficiency (>10%) for UV light (205-310 nm).
Ultrafast Pulsed Lasers: Superior for frequency doubling of ultrafast pulses.
Titanium-Sapphire and Alexandrite Lasers: High conversion efficiency for second, third, and fourth harmonics.
Argon-Ion and Copper-Vapor Lasers: Effective intracavity frequency doubling for UV output.
OPO and OPA: Wide tunable range (400-3100 nm) with high conversion efficiency.
Electro-Optic Applications: Wide transparency range, high damage threshold, and compact structure advantages.

BBO Crystal OPO Tuning Curve

Type I BBO Crystal OPO Tuning Curve Type II BBO Crystal OPO Tuning Curve

Barium Borate Crystal Packing And Shipping

Barium Borate (BBO) Crystal will be securely packaged in sturdy containers with cushioning materials to prevent movement or damage during shipping. This careful packaging ensures that the product arrives in perfect condition, maintaining its high-quality standards throughout the delivery process.

Barium Borate Crystal | BBO Crystal Packing

Where to Buy Barium Borate (BBO) Crystal in Bulk?

Heeger Materials Inc., a professional supplier and manufacturer of high-quality Nonlinear Crystals products including Barium Borate (BBO) Crystal, leverages extensive expertise in supply and export to offer competitive prices. We provide customized solutions to meet specific requirements, ensuring exceptional quality and customer satisfaction.

Heeger Materials Inc. was established in 2016 in Colorado, USA. We specialize in premium-grade metals, alloys, ceramics, powders, and other materials catering to research, development, and large-scale industrial production in scientific and industrial sectors.

Nonlinear Crystal Stock Models

Nonlinear Crystal Type	BBO, ß-BaB₂O₄	KTP, KTiOPO₃	LBO, LiB₃O₅	BIBO, BiB₃O₆	CLBO, CsLiB₆O₁₀
Transmission Range (nm)	190-3500	350-4500	160-2600	286-2500	180-2750
SHG Phase-Matching Range (nm)	409.6-3500 (Type I) 25-3500 (Type II)	994-2000 (Type II)	551-2600 (Type I) 790-2150 (Type II)	574-2480	473-2750 (Type I) 636-2750 (Type II)
Effective Nonlinear Coefficient deff SHG 1064 nm [pm/V]	2.14 (Type I) 1.47 (Type II)	4.03 (Type II)	0.82 (Type I)	3.34	0.9 (Type I, 4HG) 1.19 (Type I, 5HG) 0.95 (Type II)
Absorption Coefficient [%/cm]	<0.1@1064nm <1@532nm	<0.1@1064nm <1@532nm	<0.1@1064nm <0.3@532nm	<0.1@1064nm	<0.03@1064nm <0.1@532nm
Acceptance Angle SHG 1064 nm [mrad/cm]	0.8 (Type I) 1.27 (Type II)	14.2 (φ) 55.3 (θ)	6.54 (Type I) 15.27 (Type II)	1.03 (ee-o)	0.45 (Type I, 4HG) 0.42 (Type I, 5HG) 1.90 (Type II)
Walk-off Angle SHG 1064 nm [mrad]	55.6 (Type I) 69.4 (Type II)	4.87 (Type II)	6.7 (Type I) 6.4 (Type II)	24.5 (Type I)	7.85 (Type I, 4HG) 7.33 (Type I, 5HG) 33.1 (Type II)
Acceptance Temperature SHG 1064 nm [°C/cm]	70	24	6.7 (Type I) 7.5 (Type II)	2.17	8.30 (Type I, 4HG) 4.60 (Type I, 5HG) 43.1 (Type II)
Acceptance Spectrum	1.1	0.56	1.0 (Type I) 1.3 (Type II)	0.96 (ee-o)	0.13 (Type I, 4HG) 0.16 (Type I, 5HG) 5.60 (Type II)

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