Lithium triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal, which is one of the most widely used frequency doubling at present. The crystal has good internal optical uniformity and a wide transmission band, and has a high matching efficiency and laser damage threshold.
Main advantages of LBO crystal:
• Wide wavelength range of transparency (160—2600nm);
• Good optical uniformityδn≈10-6/cm), less internal clamping;
• High second harmonic conversion efficiency (three times of KDP crystal);
• High damage threshold (1053nm laser with pulse width of 1.3ns can achieve 10GW/cm2);
• Wide receiving angle, small dispersion angle;• Wide band range of type I, II non-critical phase matching (NCPM);
• Spectral non-critical phase matching (NCPM) near 130nm.
Parameter Indicators:
| Aperture | Maximum 30X30 mm, Minimum 2X2 mm |
| Size Tolerance | ± 01mm |
| Parallelism | ≤20 arc seconds |
| Perpendicularity | ≤5 arc minutes |
| Surface Finish | 20-10 |
| Flat | λ/10 @ 633 nm |
| Angle Tolerance | Δθ ≤ 0.25°, Δφ ≤ 0.5° |
| Chamfer | ≤ 0.2mm x 45° |
| Crack | ≤ 0.1mm |
| Damage Threshold | 800MW/cm2 at 10Hz |
| Wavelength Range | 160-2600nm |
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