Lithium triborate

Lithium triborate
	; __Li+ __ B3+ __ O2−
Identifiers
CAS Number	12007-41-9 ;
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). verify (what is ?) Infobox references

Lithium triborate (LiB₃O₅) or LBO is a non-linear optical 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 Chen Chuangtian and others of the Fujian Institute of Research on the Structure of Matter, 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 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

^ U.S. patent 4,826,283 (issued in 1989), 2023845 in Japan and CN88102084.2 in China.
^ LBO crystal applications at www.eksmaoptics.com

External links

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

[1] U.S. patent 4,826,283 (issued in 1989), 2023845 in Japan and CN88102084.2 in China.

[2] LBO crystal applications at www.eksmaoptics.com

[1]

[2]

Identifiers
__Li⁺ __ B³⁺ __ O²⁻
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 (n_D)	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 verify (what is ^YN ?) Infobox references