LBO crystals company


Lithium Triborate LiB3O5 (LBO) crystal is an excellent frequency crystal, which is a widely used frequency doubling device.The crystal has good optical uniformity, wide penetration band, and high matching efficiency and laser damage threshold. LBO crystals have stable chemical properties, high mechanical hardness, low deliquescence and birefringence less than BBO crystals, so help to limit the phase matching spectral range.

Product Description

Main advantages: 

Wide range of light transmittance band (160-2600nm);

Good optical uniformity (n 10 -6 /cm), less internal inclusion;

High multiple frequency conversion efficiency (equivalent to 3 times that of the KDP crystal); 

High damage threshold value (1053nm laser with 1.3ns pulse width 10GW/cm2); 

Wide reception Angle, small discrete Angle; 

Class I, class II non-critical phase matching (NCPM) band range is wide; Spectral non-critical phase matching (NCPM) is close to 1300nm. 

Typical application: 

1. Double frequency: Nd: YAG laser; High-power Nd: YAG and Nd: YLF laser for scientific research and military purposes; Nd: YVO4, Nd: YAG and Nd: Pump of YLF laser; Ruby, Ti: Sappire and Cr: LiSAF Laser. 

2. Triple-frequency: Nd: YAG and Nd: YLF laser; Optical Parametric amplifier (OPA) and optical parametric oscillator (OPO); High power 1340nm Nd: double, triple frequency of YAP laser.

Material Properties

Crystal StructureOrthorhombic, Space group Pna21, Point group mm2
Lattice Constanta=8.4473Å, b=7.3788Å, c=5.1395Å
Melting PointAbout 834℃
Mohs Hardness6
Thermal-conductivity Coefficient3.5W·m-1·K-1
Thermal Expansivityαx=10.8×10-5/K, αy= -8.8×10-5/K, αz=3.4×10-5/K
Transmission Band Range160nm-2600nm
Phase Matching Range551nm-2600nm (Type I)   790nm-2150nm (Type II)
Thermo-optical Coefficientdnx/dT=-9.3×10-6
dnz/dT=(-6.3-2.1l) ×10-6
Absorption Coefficient< 0.1%/cm @ 1064nm    <0.3%/cm @ 532nm
Acceptance Angle6.54 mrad·cm-1 (φ, Type I,1064 SHG)
15.27 mrad·cm-1 (q, Type II,1064 SHG)
Temperature Acceptance Angle Width4.7℃·cm-1 (Type I, 1064 SHG)
7.5℃·cm-1 (Type II,1064 SHG)
Spectral Reception1.0nm·cm-1 (Type I, 1064 SHG)
1.3nm·cm-1 (Type II,1064 SHG)
Walk Off Angle0.60° (Type I 1064 SHG)
0.12° (Type II  1064 SHG)
Non-linear Coefficientdeff(I)=d32cosφ (Type I in XY plane)
deff(I)=d31cos2θ+d32sin2θ (Type I in XZ plane)
deff(II)=d31cosθ  (Type II in YZ plane)
deff(II)=d31cos2θ+d32sin2θ   (Type II in XZ plane) 
Nonlinear Magnetization Coefficientd31=1.05 ± 0.09 pm/V   d32= -0.98 ± 0.09 pm/V
d33=0.05 ± 0.006 pm/V
Sellmeier Equation [λ in μm] nx2=2.454140+0.011249/(λ2-0.011350)-0.014591λ2-6.60x10-5λ4

Technical Parameter

Crystro offers

Dimensional Tolerance(W±0.1mm) ×(H±0.1mm) ×(L+0.5/-0.1mm) (L≥2.5mm) 
(W±0.1mm) ×(H±0.1mm) ×(L+0.1/-0.1mm) (L<2.5mm)
Angle ToleranceΔθ ≤ 0.25°  Δφ ≤ 0.25°
Clear Aperture90% 
Damage Threshold [GW/cm2]>10 @1064nm, TEM00, 10ns, 10Hz (Polish)
 >1 @1064nm, TEM00, 10ns, 10Hz (AR Coated)
>0.5 @532nm, TEM00, 10ns, 10Hz (AR Coated)
Flatness< λ/8@633nm
Parallelism< 20"
Perpendicularity≤ 5' 
Surface Quality[S/D]< 10/5
Wavefront Distortion< λ/8@633nm
Internal Quality 50mW green light detection without dispersion
WarrantyOne year
Note: Above parameters for reference only, please contact our sales Rep. for your specific requirement.


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