| Lithium triborate | |
|---|---|
| Properties | |
| Molecular formula | LiB3O5 |
| Molar mass | ??? g/mol |
| Appearance | colorless, odorless gas |
| Density | 2.747 g/cm3 |
| Refractive index (nD) | 1.1120 |
| Structure | |
| Molecular shape | Orthorhombic |
| Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa) | |
| Infobox references | |
Lithium triborate (LiB3O5) LBO is a non-linear optics crystal. It has a wide transparency range, moderately high nonlinear coupling, high damage threshold and desirable chemical and mechanical properties. This crystal is often used for second harmonic generation (SHG, also known as frequency doubling) of Nd:YAG lasers (1064 nm → 532 nm). LBO can be both critically and non-critically phase-matched. In the latter case the crystal has to be heated or cooled depending on the wavelength.
Lithium triborate is an excellent nonlinear optical crystal discovered and developed by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences). It has been patented under U.S. Patent 4,826,283 (issued in 1989), 2023845 in Japan and CN88102084.2 in China.
- Point group: mm2
- Lattice parameters: a=8.4473 Å, b=7.3788 Å, c=5.1395 Å
- Mohs hardness: 6
- Transmission range: 0.16 – 2.6 μm
- Damage threshold: 25 J/cm2 (1064 nm, 10 ns pulses)
- Thermal expansion coefficients: x: 10.8×10−5/K, y: −8.8×10−5/K, z: 3.4×10−5/K
- Specific heat: 1060 J/kg·K
- Melting point: 834 °C
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