Nonlinear Optical Crystals: LBO
LBO crystals (Lithium Triborate Crystal) 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.
Advantages:
- broad transparency range from 160nm to 2600nm (see Figure 1);
- high optical homogeneity (δn≈10-6/cm) and being free of inclusion;
- relatively large effective SHG coefficient (about three times that of KDP);
- wide acceptance angle and small walk-off;
- type I and type II non-critical phase matching (NCPM) in a wide wavelength range;
- spectral NCPM near 1300nm.
- high damage threshold(18.9 GW/cm 2 for a 1.3ns laser at 1053nm); LBO has the highest damage threshold in all the commonly-used inorganic NLO crystals. Therefore, it is the best candidate for high average power SHG and other nonlinear optical processes.
| Comparison of Bulk Damage Threshold (@1053nm ,1.3ns) | |||
| Crystal | Energy Density (J/cm 2 ) | Power Density (GW/cm 2 ) | Ratio |
| KTP KDP BBO LBO |
6.0 10.9 12.9 24.6 |
4.6 8.4 9.9 18.9 |
1.00 1.83 2.15 4.10 |
LBO’s main applications
- SHG, THG of Nd lasers
- SHG of Ti:Sapphire, Cr:LiSAF and Alexandrite lasers
- OPA and OPO
We offer LBO specification:
| Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
| Tolerance of dimension | Dimension+/-0.1 mm，L：±0.1mm |
| Flatness | λ/8 @ 632.8nm |
| Wavefront distortion | λ/8@ 632.8nm |
| Surface quality | 10/5 per MIL-O-13830A |
| Parallelism | 10″ |
| Perpendicularity | 5′ |
| Bevel/chamfer | <0.1mm@45deg. |
| Chips | <0.1mm |
| CA | >95% |
| Coating | AR/P-coating Upon customer’s request |
| Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
| Warranty | One year under proper use |
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