Lithium Triborate Crystal | LBO Crystal

Data sheet

Density	2.47 g/cm³
Materials	LBO
Melting Piont	834 ℃
Molecular Formula	LiB3O5

More info

Lithium Triborate (LBO) Crystal is widely used for frequency doubling and other nonlinear optical processes. It offers a broad transmission range, a high laser damage threshold, and excellent optical uniformity. With stable chemical properties, high mechanical hardness, and low birefringence compared to BBO, LBO limits the spectral range of phase matching for improved efficiency. Heeger Materials (HM) provides high-quality LBO crystals for advanced applications.

Lithium Triborate Crystal | LBO Crystal

Lithium Triborate Crystal Specifications

Dimensions Tolerance	(W±0.1 mm)×(H±0.1 mm)×(L+0.5/-0.1 mm) (L≥2.5 mm) (W±0.1 mm)×(H±0.1 mm)×(L+0.1/-0.1 mm) (L＜2.5 mm)
Effective Aperture	90% of the central region diameter
Flatness	λ/8 @ 633 nm
Transmitted Wavefront Distortion	λ/8 @ 633 nm
Surface Quality	10/5 per MIL-PRF-13830B standard
Parallelism	20″
Perpendicularity	15′
Angle Deviation	Δθ≦0.25°, ΔФ≦0.25°
Chamfer	≤0.2 mm×45°
Edge Chip	≤0.1 mm
Damage Threshold	>10 GW/cm² @ 1064 nm, 10 ns, 10 Hz (polished)
	>1 GW/cm² @ 1064 nm, 10 ns, 10 Hz (AR coating)
	>0.5 GW/cm² @ 532 nm, 10 ns, 10 Hz (AR coating)

Lithium Triborate Crystal Regular Dimensions

Size	Length (mm)	Theta	PHI	Coating	Application
6x6 mm	0.1, 0.5, 1	29.2°	90°	P/P@400-800NM	SHG@800NM, Type I
10x10 mm	0.1, 0.5, 1	29.2°	90°	P/P@400-800NM	SHG@800NM, Type I
6x6 mm	0.1, 0.5, 1	44.3°	90°	P/P@400-800/266 nm	THG@800NM, Type I
10x10 mm	0.1, 0.5, 1	44.3°	90°	P/P@400-800/266 nm	THG@800NM, Type I
6x6 mm	0.5, 1, 1.5	23.4°	90°	AR/Ar@515+1030 nm	SHG@1030NM, Type I
6x6 mm	0.15, 0.25, 0.55	32.5°	90°	AR/Ar@1030+515/343 nm	THG@1030, Type I
10x10 mm	0.5, 1	23.4°	90°	AR/Ar@515+1030 nm	SHG@1030NM, Type I

Lithium Triborate Crystal Chemical and Structural Properties

Crystal Structure	Orthorhombic, space group Pna21, point group mm2
Unit Cell Parameters	a=8.4473 Å, b=7.3788 Å, c=5.1395 Å, Z=4
Melting Point	~834 ℃
Mohs Hardness	6 Mohs
Density	2.47 g/cm³
Thermal Conductivity	3.5 W/m/K
Thermal Expansion Coefficient	αx=10.8×10^-5 /K, αy=-8.8×10^-5 /K, αz=3.4×10^-5 /K

Lithium Triborate Crystal Optical and Nonlinear Optical Properties

Transmission Range	160-2600 nm
SHG Phase Matching Range	551-2600 nm (TypeⅠ), 790-2150 nm (Type Ⅱ)
Thermal Optic Coefficient (/℃, λ in μm)	dnx/dT=-9.3×10⁻⁶ dny/dT=-13.6×10⁻⁶ dnz/dT= (-6.3-2.1λ)×10⁻⁶
Absorption Coefficient	＜0.1%/cm @ 1064 nm, ＜0.3%/cm @ 532 nm
Acceptance Angle	6.54 mrad·cm (Ф, Type Ⅰ, 1064 SHG) 15.27 mrad·cm (θ, Type Ⅱ, 1064 SHG)
Temperature Bandwidth	4.7℃·cm (Type Ⅰ, 1064 SHG) 7.5℃·cm (Type Ⅱ, 1064 SHG)
Acceptance Spectral Width	1.0 nm·cm (Type Ⅰ, 1064 SHG) 1.3 nm·cm (Type Ⅱ, 1064 SHG)
Walk-off Angle	0.60° (Type Ⅰ, 1064 SHG) 0.12° (Type Ⅱ, 1064 SHG)
NLO Coefficients	deff (Ⅰ)=d32cosФ (Type Ⅰ, XY plane) deff (Ⅰ)=d31cos2θ+d32sin2θ (Type Ⅰ, XZ plane) deff (Ⅱ)=d31cosθ (Type Ⅱ, YZ plane) deff (Ⅱ)=d31cos2θ+d32sin2θ (Type Ⅱ, XZ plane)
Non-zero Nonlinear Optical Coefficients	d31=1.05±0.09 pm/V d32=-0.98±0.09 pm/V d33=0.05±0.006 pm/V
Sellmeier Equations (λ in μm)	nx² = 2.454140 + 0.011249 / (λ² - 0.011350) - 0.014591 λ² - 6.60 × 10⁻⁵ λ⁴ ny² = 2.539070 + 0.012711 / (λ² - 0.012523) - 0.018540 λ² + 2.00 × 10⁻⁴ λ⁴ nz² = 2.586179 + 0.013099 / (λ² - 0.011893) - 0.017968 λ² - 2.26 × 10⁻⁴ λ⁴

Lithium Triborate Crystal Transmittance Curve

Lithium Triborate Crystal SHG and THG Properties

LBO crystals can be used for second and third-harmonic generation (SHG and THG) phase matching of Nd: YAG and Nd: YLF lasers, supporting both Type I and Type II phase matching. At room temperature, within the broad wavelength range of 551 nm to 2600 nm, Type I phase matching with the highest effective nonlinear optical coefficients can be achieved on the XY and XZ planes, while the optimal Type II phase matching for LBO crystals occurs on the YZ and XZ planes. As shown in the figure below:

LBO Crystals SHG and THG Properties

LBO Crystal SHG Tuning Curve

Lithium Triborate Crystal Non-Critical Phase Matching

Non-critical Phase Matching (NCPM) of LBO crystals features no walk-off, a wide acceptance angle, and high effective coefficients. Fully utilizing these characteristics allows LBO to achieve optimal performance.

SHG Characteristics of Type I NCPM for 1064 nm Light
NCPM Temperature	148 ℃
Acceptance Angle	52 mrad•cm
Walk-off Angle	0
Temperature Bandwidth	4 ℃•cm
Effective SHG Coefficient	2.69×d36 (KDP) = 1.18 pm/V

Using Non-Critical Phase Matching (NCPM) LBO crystals, Nd: YAG lasers achieve second harmonic generation (SHG) conversion efficiencies greater than 70% in pulsed mode and greater than 30% in continuous mode, with good beam quality and stable output. As shown in the figure below, at room temperature, LBO crystals can achieve Type I and Type II NCPM along the X-axis and Z-axis respectively.

LBO Crystals Non-Critical Phase Matching

The characteristics of Type I and Type II phase matching and Non-Critical Phase Matching (NCPM) of LBO crystals provide a broad scope for in-depth research and applications in the fields of Optical Parametric Oscillators (OPO) and Optical Parametric Amplifiers (OPA).

OPO Tuning Curve of LBO Crystals

Type I OPO Tuning Curve of LBO Crystals Type II OPO Tuning Curve of LBO Crystals

Lithium Triborate Crystal Spectrum NCPM

LBO crystals can achieve both angle-tuning NCPM and spectral-tuning NCPM (SNCPM). These spectral characteristics of LBO crystals are particularly suitable for frequency doubling of broadband coherent radiation around 1.3 μm, such as certain diode lasers and OPA/OPO outputs without linewidth narrowing components.

Lithium Triborate Crystal AR-Coating

Coatable dual-wavelength antireflection coating (DBAR) for 1064 nm frequency doubling.
Coatable triple-wavelength antireflection coating for 1064 nm tripling.
Antireflection coatings with low reflectance: R < 0.2% at 1064 nm, R < 0.5% at 532 nm, R < 0.2% at 355 nm.
Custom ultra-low reflectance coatings available based on application needs: R < 0.05% at 1064 nm, R < 0.1% at 532 nm.
Broadband antireflection coating (BBAR) is suitable for tunable laser frequency doubling applications.
IBS or IAD coating technologies can be chosen based on customer application needs.
High laser damage threshold.
Long lifespan.
Custom coating services are available for different coating systems.

Lithium Triborate Crystal Key Advantages

Wide transmission range (160-2600 nm)
Good optical uniformity (δn≈10⁻⁶/cm), minimal internal defects
High-frequency conversion efficiency (three times that of KDP crystals)
High damage threshold
Wide acceptance angle, small walk-off angle
Wide wavelength range for I and II type non-critical phase matching (NCPM)
Spectral non-critical phase matching (NCPM) close to 1300 nm

Lithium Triborate Crystal Applications

1. Frequency Doubling:

Nd: YAG lasers for medical and industrial applications.
High-power Nd: YAG and Nd: YLF lasers for research and military use.
Pumping of Nd: YVO4, Nd: YAG, and Nd: YLF lasers.
Ruby, Ti: Sapphire, and Cr: LiSAF lasers.

2. Frequency Tripling

Nd:YAG and Nd:YLF lasers.
Optical parametric amplifiers (OPA) and optical parametric oscillators (OPO).
Second and third harmonic generation for high-power 1340 nm Nd: YAP lasers.

Lithium Triborate Crystal Packing And Shipping

Lithium Triborate (LBO) 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.

Lithium Triborate Crystal | LBO Crystal Packing

Where to Buy Lithium Triborate Crystal in Bulk?

Heeger Materials Inc., a professional supplier and manufacturer of high-quality Nonlinear Crystals products including Lithium Triborate (LBO) 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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