LBO
Lithium Triborate-LBO
Lithium Triborate (LBO) crystal (LiB3O5) has a wide transmittance band range (160-2600nm), high frequency doubling conversion efficiency, and its conversion efficiency is three times that of KDP crystal. Its light damage threshold is very high, light uniformity is very good, receiving angle is wide, mechanical properties are good, thermal shock resistance is strong, micro deliquescence, and nonlinear coefficient is large. It is one of the crystals with the best comprehensive performance among nonlinear crystals.
Specifications
| Dimension Tolerance | (W±0.1 mm) × (H±0.1 mm) × (L+0.2/-0.1 mm) |
| Clear Aperture | >90% |
| Surface Quality (Scratch/Dig) | 10/5 |
| Flatness | ≤λ/8 @633 nm |
| Transmitted Wave-front Distortion | ≤λ/8 @633 nm |
| Parallelism | ≤10’’ |
| Perpendicularity | ≤10’ |
| Angle Tolerance | ±0.25 ° |
| Chamfer | ≤0.2 mm × 45 ° |
| Chip | ≤0.1 mm |
| Damage Threshold | >10 GW/cm2 @1064 nm, 10 ns, 10 Hz (polished only) |
| >1 GW/cm2 @1064 nm, 10 ns, 10 Hz (AR-coated) | |
| >0.5 GW/cm2 @532 nm, 10 ns, 10 Hz (AR-coated) | |
| Coatings | Customized |
Chemical and Structural Properties
| Crystal Structure | Orthorhombic, Space group Pna21, Point group mm2 |
| Lattice Parameter | a = 8.4473 Å, b = 7.3788 Å, c = 5.1395 Å, Z = 2 |
| Melting Point | About 834 ℃ |
| Mohs Hardness | 6 Mohs |
| Density | 2.47 g/cm3 |
| Thermal Conductivity | 3.5 W/m/K |
| Thermal Expansion Coefficients | αx = 10.8 × 10-5 /K, αy = – 8.8 × 10-5 /K, αz = 3.4 × 10-5 /K |
Optical and Nonlinear Optical Properties
| Transparency Range | 160-2600 nm |
| SHG Phase Matchable Range | 551-2600 nm (Type Ⅰ) 790-2150 nm (Type Ⅱ) |
| Therm-optic Coefficient
(/℃, λ in μm) |
dnx / dT = – 9.3 ×10-6
dny / dT = – 13.6 × 10-6 dnz / dT = (- 6.3 – 2.1 λ) × 10-6 |
| Absorption Coefficients | <0.1% /cm at 1064 nm, <0.3% /cm at 532 nm |
| Angle Acceptance | 6.54 mrad·cm (Φ, Type Ⅰ, 1064 SHG)
15.27 mrad·cm (θ, Type Ⅱ, 1064 SHG) |
| Temperature Acceptance | 4.7 ℃·cm (Type Ⅰ, 1064 SHG)
7.5 ℃·cm (Type Ⅱ, 1064 SHG) |
| Spectral Acceptance | 1.0 nm·cm (Type Ⅰ, 1064 SHG)
1.3 nm·cm (Type Ⅱ, 1064 SHG) |
| Walk-off Angle | 0.60 ° (Type Ⅰ, 1064 SHG)
0.12 ° (Type Ⅱ, 1064 SHG) |
| NLO Coefficients | deff (Ⅰ) = d32 cosΦ (Type Ⅰ in XY plane)
deff (Ⅰ) = d31 cos2θ + d32 sin2θ (Type Ⅰ in XZ plane) deff (Ⅱ) = d31 cosθ (Type Ⅱ in YZ plane) deff (Ⅱ) = d31 cos2θ + d32 sin2θ (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) – 0.014591 λ2 – 6.60 × 10-5 λ4
ny2 = 2.539070 + 0.012711 / (λ2 – 0.012523) – 0.018540 λ2 + 2.00 × 10-4 λ4 nz2 = 2.586179 + 0.013099 / (λ2 – 0.011893) – 0.017968 λ2 – 2.26 × 10-4 λ4 |
