Specifications:
| Material | LBO crystals | Size | (4± 0.1 mm) x (4± 0.1 mm) x (10 + 0.2 mm/-0.1 mm) |
| Cut Angle | θ=90°±0.5°，Φ=0° | Clear Aperture | central 80% diameter |
| Transmitting Wavefront Distortion | less than λ/8 @ 633nm | Flatness | λ/8 @ 633nm |
| Surface Quality | 10/5 Scratch/Dig to MIL-O-13830A | Parallelism | better than 20 arc seconds |
| Perpendicularity | 15 arc minutes | Damage Threshold | 15 GW/cm2 for a TEM00 mode, 1.3 ns, 1 Hz laser at 1.064 m1 GW/cm2 for a cw, mode-locked laser at 1064nm |
| Quality Warranty Period | one year |
Chemical and Structure Properties:
| 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 | 2.47 g/cm3 | Thermal Conductivity | 3.5W/m/K |
| Thermal Expansion Coefficient | ax=10.8x10-5 /K, ay=-8.8x10-5/K, az=3.4x10-5/K | ||
Optical and Nonlinear Optical Properties:
| Transparency Range | 160-2600nm | SHG Phase Matchable Range | 551 ~ 2600nm (Type I) 790-2150nm (Type II) |
| Therm-optic Coefficient (°C, λ in μm) | dnx/dT=-9.3X10-6 dny/dT=-13.6X10-6 dnz/dT=(-6.3-2.1l)X10-6 |
Absorption Coefficient | <0.1%/cm at 1064nm <0.3%/cm at 532nm |
| Angle Acceptance | 6.54mrad-cm(φ, Type I,1064 SHG) 15.27mrad-cm(q, Type II,1064 SHG) |
Temperature | 4.7°C-cm (Type I, 1064 SHG) |
| Acceptance | 7.5°C-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 Coefficient | 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)-0.014591λ2-6.60x10-5λ4 ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.0x10-4λ4 nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26x10-4λ4 |
Lithium Tri-borate or LBO crystals (LiB3O5) is one of the most useful nonlinear optical material not just for its relatively large conversion coefficient - 3x that of KDP, but also for its excellent physical properties. LBO crystal has broad optical transparency range from 160 to 2600nm. It excels in high power SHG with minimal thermal lensing as compared to KTP. Its large acceptance angle paired with small walk-off angle which reduces the beam quality requirement for source lasers.
LBO is widely used for SHG and THG of Nd:YAG, Nd:YLF, Nd:YVO4 and ultra-fast Ti:sapphire lasers. OPOs(Optical Parametric Oscillators) and OPAs(Optical Parametric Amplifier).
