Lithium Triborate (LiB3O5, LBO) Nonlinear crystals
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. NOVA is 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.
Technical parameters of LBO
Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
Tolerance of dimension | Dimension+0/-0.1 mm，L：±0.1mm |
Flatness | λ/10 @ 632.8nm |
Wavefront distortion | λ/8@ 632.8nm |
Surface quality | 10/5 per MIL-O-13830A |
Parallelism | 20″ |
Perpendicularity | 5′ |
Clear Aperture: | > 90% |
Chamfer: | < 0.1 mm @ 45° |
Size | Upon customer request |
Coating | AR/PR coating upon customer’s request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
Quality Warranty Period | One year under proper use |
Optical and Nonlinear properties of LBO crystal
Transparency Range | 160-2600nm |
SHG Phase Matchable Range | 551-2600nm (Type I) 790-2150nm (Type II) |
Therm-optic Coefficient (/℃, λ in μm) | dnx/dT=-9.3x10-6 |
dny/dT=-13.6x10-6 | |
dnz/dT=(-6.3-2.1λ)x10-6 | |
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) |
7.5℃·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) |
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) | |
Non-vanished NLO susceptibilities | 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)-0.014591λ2-6.60×10-5λ4 |
ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.00×10-4λ4 | |
nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26×10-4λ4 |
Physical properties of LBO crystal
Crystal Structure | Orthorhombic, Space group Pna21, Point group mm2 |
Lattice Parameter | a=8.4473Å,b=7.3788Å,c=5.1395Å,Z=2 |
Melting Point | About 834℃ |
Mohs Hardness | 6 |
Density | 2.47g/cm3 |
Refractive indices | nX= 1,5656; nY= 1,5905; nZ= 1,6055 @1064 nm |
Thermal Conductivity | 3.5W/m/K |
Thermal Expansion Coefficients | αx=10.8x10-5/K, αy=-8.8x10-5/K,αz=3.4x10-5/K |
