NLO Crystals

/LBO Nonlinear Optical crystal Lithium Triborate Crystal

LBO Nonlinear Optical crystal Lithium Triborate Crystal

HGO grows LBO Nonlinear crystals using flux technology. LBO crystals is an excellent nonlinear crystal.For frequency doubling(SHG),tripling(THG) of Nd:YAG,Nd:YLF,Nd:YVO4 lasers, it is one of the most useful nonlinear optical materials in ultraviolet and visible laser applications.

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  • Shipping Port:

    Fuzhou, China
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HGO grows Lithium Triborate (LiB3O5, LBO) Nonlinear crystals using flux technology. LBO a broad transparency range, wide acceptance angle, small walk-off angle, and the highest damage threshold among common nonlinear crystals.

Most common applications include high-power near-infrared wavelength second harmonic generation, sum-frequency generation to produce visible, ultraviolet laser light, and visible, near-infrared widely tuned optical parametric oscillators. HGO are capable of providing uncoated super-polished LBO crystals desired, e.g. for high-power UV generation via sum-frequency generation of 1064 nm and 532 nm.

Main applications:


2) OPA and OPO


1) Broad transparency range from 160nm to 2600nm;

2) High optical homogeneity (δn≈10-6/cm) and free of inclusion;

3) Large effective SHG coefficient;

4) Wide acceptance angle and small walk-off;

5) Type I and type II non-critical phase matching (NCPM) in a wide wavelength range;

6) High damage threshold(18.9 GW/cm 2 for a 1.3ns laser at 1053nm)

7) Spectral NCPM near 1300nm

Optical and Nonlinear properties of LBO crystal

Transparency Range


SHG Phase Matchable Range

551-2600nm (Type I) 790-2150nm (Type II)

Therm-optic Coefficient (/, λ in μm)


Absorption Coefficients

<0.1%/cm at 1064nm <0.3%/cm at 532nm

Angle Acceptance

6.54mrad·cm (φ, Type I,1064 SHG)
15.27mrad·cm (θ, Type II,1064 SHG)

Temperature Acceptance

4.7·cm (Type I, 1064 SHG)
·cm (Type II, 1064 SHG)

Spectral Acceptance

1.0nm·cm (Type I, 1064 SHG)
1.3nm·cm (Type II, 1064 SHG)

Walk-off Angle

0.60° (Type I 1064 SHG)
0.12° (Type II 1064 SHG)

NLO Coefficients

deff(I)=d32cosΦ (Type I in XY plane)
θ (Type I in XZ plane)
θ (Type II in YZ plane)
θ+d32sin2θ (Type II in XZ plane)

Non-vanished NLO susceptibilities

d31=1.05± 0.09 pm/V
d32= -0.98
± 0.09 pm/V
± 0.006 pm/V

Sellmeier Equations (λ in μm)


Physical properties of LBO crystal

Crystal Structure

Orthorhombic, Space group Pna21, Point group mm2

Lattice Parameter


Melting Point

About 834

Mohs Hardness




Refractive indices

nX= 1,5656; nY= 1,5905; nZ= 1,6055 @1064 nm

Thermal Conductivity


Thermal Expansion Coefficients

αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K

HGO offers LBO specifications:

Tolerance of cutting angle


Tolerance of dimension

Dimension+0/-0.1 mmL±0.1mm


λ/10 @ 632.8nm

Wavefront distortion

λ/8@ 632.8nm

Surface quality

10/5 per MIL-O-13830A





Clear Aperture:

> 90%


< 0.1 mm @ 45°


Upon customer request


AR/PR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use

Why Choose HGO ?

HGO grows LBO crystals( Lithium Triborate Crystal) in house using Flux growth technology. High quality of starting material is used for crystal growth and strict quality control is applied to our LBO’s absorption ,scattering loss, bulk loss ,wavefront distortion ,inclusions and all the other required processing specs which assures that each crystal from HGO will comply with will comply with customer’s specification and perform well in laser system.

HGO can supply large size of LBO up to 30mm*30mm*30mm and max length up to 60mm. We have over 13 years crystals growth experiences and HGO’s LBO has been well recognized as high qulity and low price by our customers from all over the world.

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