LBO crystals
Main features
- Broad transparency range from 155 nm to 3200 nm
- Absence of photochromic damage (gray-tracking)
- Highest damage threshold among common nonlinear crystals
- Small walk-off angle at room temperature, no walk-off at non-critical phase-matching (NCPM) regime
- Wide acceptance angle
- Temperature tunable type I and II non-critical phase-matching
- Super-polished and customized crystals available upon request
Application examples
- Sum-frequency generation of 532 nm and 1064 nm to produce 355 nm UV
radiation - Widely tunable OPOs in NIR range pumped by second harmonic of Nd-doped
lasers - Efficient second harmonic generation at 1064 nm without walk-off effect
(NCPM, T = 149 ˚C)
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- Description
- Properties
- Standard specifications
Lithium Triborate (LiB3O5, LBO) crystals feature broad transparency range, wide acceptance angle, small walk-off angle and 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, utraviolet laser light and visible, near-infrared widely tuned optical parametric oscillators. 4Lasers are capable to provide uncoated super-polished LBO crystals desired, e.g. for high-power UV geration via sum-frequency generation of 1064 nm and 532 nm.
| Physical and optical properties | |
|---|---|
| Single crystal | LiB3O5 |
| Crystal structure | Orthorhombic, mm2 |
| Lattice parameters | a = 8,46 Å, b = 7,38 Å , c = 12,717 Å |
| Optical symmetry | Negative biaxial (2Vz = 109,2° @0,5321 μm) |
| Density | 2,474 g/cm3 |
| Mohs hardness | 6-7 |
| Transparency range | 155 nm - 3,2 μm @“0“ transmittance level |
| Sellmeier equations @ T = 293 K (λ in μm)) | nX2 = 2,4542 + 0,01125/(λ2 - 0,01135) - 0,01388 λ2; nY2 = 2,5390 + 0,01277/(λ2 - 0,01189) - 0,01849 λ2 + 4,3025×10-5 λ4 - 2,9131×10-5 λ6; nZ2 = 2,5865 + 0,0131/(λ2 - 0,01223) - 0,01862 λ2 + 4,5778×10-5 λ4 - 3,2526×10-5 λ6 |
| Refractive indices @1064 nm | nX = 1,5656; nY = 1,5905; nZ = 1,6055 |
| LBO crystals | |
|---|---|
| Orientation accuracy | <30 arcmin |
| Clear aperture | >90% |
| Face dimensions tolerance | +0/-0,1 mm |
| Length tolerance | ±0,1 mm |
| Parallelism error | <20 arcsec |
| Perpendicularity error | <10 arcmin |
| Protective chamfers | <0,1 mm at 45° |
| Surface quality | 10-5 S-D |
| Wavefront distortion | <λ/[email protected],8 nm |
| Coatings | AR(R<0,25%) at operating wavelength on both faces |
| Laser induced damage threshold | >1 GW/cm2@1064 nm, 10 ns |
| Mount | Unmounted |
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