LBO -

NLO CRYSTALS

Lithium borate(LBO)

Lithium borate (LBO) is a kind of nonlinear laser crystal with excellent performance, which belongs to the orthogonal crystal system mm2 lattice. It consists of a continuous b3o7 grid and lithium ions in the voids. The close packed b3o7 clusters make LBO crystal almost free ot any impurities. Ketong optoelectronics uses the improved molten salt method to grow LBO crystal, which has excellent quality and can be used in many fields.

CASTON'S LBO featured：

● High light transmittance, ranging from 160nm to 2600nm (frequency doubling range：550nm to 2600nm)

●The wavelength range of noncritical phase matching of class I and class ll crystals is wide

● Relatively large effective octave coefficient (about three times of KDP)

● High damage threshold (18.9gw/cm2 at 1054nm 1.3ns laser)

● Wide receiving angle,small walking distance

● High crystal quality(homogeneity ^n =10-6/cm) few impurities

CASTON'S LBO applied to：

● SHG

High energy Nd: YAG and Nd: YLF lasers for military and scientific purposes

Ruby, Ti: Sappire and Cr: LiSAF laser

Nd: YAG laser for medical and industrial use

● THG

Nd: YAG and Nd: YLF laser

Optical parametric amplifier (OPA) and optical parametric oscillator (OPO)

Second and third harmonic generation of high power 1340nm Nd: YAP laser

Structure and physical properties:

crystal structure	Orthorhombic, space group pna21, point group mm2
cell parameters	a=0.84473nm,b=0.73788nm，c=0.51395nm，z=2
melting point	834℃
mohs hardness	6
density	2.47g/cm³
transparency range	160-2600nm
thermal coefficient	<0,1%cm at 1064nm<0.3%cm at 532nm
absorption coefficient	3.5W/m·K
Coefficient of thermal expansion	dnx/dT=-9.3x10^-6/°C dny/dT=-13.6x10^-6/°C dnz/dT=(-6.3+2.1)x10^-6/°C
Thermo optic coefficient	ax=10.8x10^-5/K ay=-8.8x10^-5/K az=3.4x10^-5/K

CASTON Standard Specification:

wavefront distortion	<1/8 λ
maximum crystal size	30x30x25 or 10x10x45 or 30x10x10 mm
section tolerance	+0.1mm/-0.1mm
length tolerance	+0.2mm/-0.2mm
chamfer	0.1mm@45°
flatness	<1/10 λ at 633mm
parallelism	<10arc second
verticality	<5 are min

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