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| Section2 = | Section3 = }} 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''), for example 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 was discovered and developed by Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences. It has been patented.〔 (issued in 1989), 2023845 in Japan and CN88102084.2 in China.〕 ==Chemical properties== *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 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「lithium triborate」の詳細全文を読む スポンサード リンク
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