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LBO
Crystallography

LBO

Supplier
Zcoptic
Category
Crystallography
Origin
China

Lithium triborate (LBO) is a nonlinear optical crystal with excellent performance, belonging to the orthorhombic crystal system with space group Pna21, melting point about 834 ℃, Mohs hardness 6, density 2.47 g/cm^3, transmission band 160-2600 nm, Type I SHG phase-matching range 551-2600 nm, Type II 790-2150 nm, absorption coefficient <0.1%/cm @ 1064 nm, damage threshold >10 GW/cm^2 (polished plate).

Specification Snapshot
Crystal Structure
Orthorhombic crystal system; space group Pna21, point group mm^2
Transmitted Wavefront Distortion
λ/8 @ 633 nm
Parallelism
20″
Damage Threshold
>10 GW/cm^2 @ 1064 nm, 10 ns, 10 Hz (polished window); >1 GW/cm^2 @ 1064 nm, 10 ns, 10 Hz (AR coating); >0.5 GW/cm^2 @ 532 nm, 10 ns, 10 Hz (AR coating)
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Overview

Lithium triborate (LBO) is a nonlinear optical crystal with excellent performance, belonging to the orthorhombic crystal system with space group Pna21, melting point about 834 ℃, Mohs hardness 6, density 2.47 g/cm^3, transmission band 160-2600 nm, Type I SHG phase-matching range 551-2600 nm, Type II 790-2150 nm, absorption coefficient <0.1%/cm @ 1064 nm, damage threshold >10 GW/cm^2 (polished plate).

Specifications

ParameterValue
Crystal StructureOrthorhombic crystal system; space group Pna21, point group mm^2
Unit Cell Parametersa=8.4473 Å， b=7.3788 Å， c=5.1395 Å， Z=4
Mohs Hardness6 Mohs
Thermal Conductivity3.5 W/m/K
Coefficient of Thermal Expansionα_x=10.8×10^-5 /K，α_y=-8.8×10^-5 /K，α_z=3.4×10^-5 /K
Transmission Band160-2600 nm
Absorption Coefficient＜0.1%/cm @ 1064 nm，＜ 0.3%/cm @ 532 nm
Receiving Angle6.54 mrad·cm （Ф，Type Ⅰ，1064 SHG） 15.27 mrad·cm （θ，Type Ⅱ，1064 SHG）
Walk-off Angle0.60° （Type Ⅰ，1064 SHG） 0.12° （Type Ⅱ，1064 SHG）
NLO Coefficientdeff(I)=d_32cosΦ (Type I, XY plane); deff(I)=d_31cos2θ+d_32sin2θ (Type I, XZ plane); deff(II)=d_31cosθ (Type II, YZ plane); deff(II)=d_31cos2θ+d_32sin2θ (Type II, XZ plane)
Nonzero Nonlinear Optical Coefficientd_31=1.05±0.09 pm/V d_32=-0.98±0.09 pm/V d_33=0.05±0.006 pm/V
Sellmeier Equation (Pure YVO4, λ in μm)n_x^2 = 2.454140 + 0.011249 / (λ^2 - 0.011350) - 0.014591λ^2 - 6.60 × 10^-5 λ^4 n_y^2 = 2.539070 + 0.012711 / λ^2 - 0.012523) - 0.018540λ^2 + 2.00 × 10^-4 λ^4 n_z^2 = 2.586179 + 0.013099 / λ^2 - 0.011893) - 0.017968 λ^2 - 2.26 × 10^-4 λ^4
NCPM Temperature148 ℃
Receiving Angle (2)52 mrad•cm
Walk-off Angle (2)0
Temperature Bandwidth (2)4 ℃•cm
Effective SHG Coefficient2.69×d36（KDP）=1.18 pm/V
Flatnessλ/8 @ 633 nm
Transmitted Wavefront Distortionλ/8 @ 633 nm
Parallelism20″
Perpendicularity15′
Warranty PeriodOne year (normal use)

Applications

Second and third harmonic generation of 1064 nm lasers; optical parametric oscillation and amplification; noncritical phase matching (NCPM) frequency doubling

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Supplier Information

Zc
Zcoptic
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Fujian Zhongce Optoelectronics Co., Ltd., founded in 2007, is a high-tech enterprise specializing in the design, production, and sales of optical and communication components. It has passed ISO9001, ISO14000, and other certifications, and is the first company in China to be listed on the OTC market with optical communication crystal materials as its main business. The company provides full supply chain services including crystal blanks, optical cold processing, optical devices, and optical coatings. Products include C/G-lenses, KTP wafers, PBS polarizing beamsplitters, waveplates, and optical isolators, applied in fiber communications and lasers. The company is committed to becoming an outstanding supplier, offering customized solutions.

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