Lithium triborate

Lithium triborate

__Li+     __ B3+     __ O2−
Identifiers
CAS Number	12007-41-9 Y
3D model (JSmol)	Interactive image
PubChem CID	23716905
InChI InChI=1S/B3O5.Li/c4-1-7-3(6)8-2-5;/q-1;+1 Key: VCZFPTGOQQOZGI-UHFFFAOYSA-N
SMILES [Li+].B(=O)OB([O-])OB=O
Properties
Chemical formula	LiB3O5
Molar mass	119.37 g·mol−1
Appearance	Colorless crystalline solid
Density	2.747 g/cm3
Melting point	834 °C (1,533 °F; 1,107 K)
Refractive index (nD)	1.5656
Structure
Molecular shape	Orthorhombic
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
Y  (what is YN ?)
Infobox references

Lithium triborate (LiB₃O₅) or LBO is a non-linear optics crystal. It has a wide transparency range, moderately high , 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 Chen Chuangtian and others of the , Chinese Academy of Sciences. It has been patented.^[1]

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

Applications of lithium triborate (LBO) crystal[]

Lithium triborate (LBO) crystals are applicable in various nonlinear optical applications:^[2]

• Frequency doubling (SHG) and frequency tripling of high peak power pulsed Nd doped, Ti:Sapphire lasers and Dye lasers
• NCPM (non-critical phase matching for frequency conversion of CW and quasi CW radiation
• OPO (Optical parametric oscillator) of both Type 1 and Type 2 phase-matching

References[]

External links[]

• LBO Crystal (Lithium Triborate) at www.redoptronics.com