Lithium Triborate (LBO) Crystal

LBO (LiB₃O₅) is an excellent non-linear optical crystal. It is phase matchable for the SHG and THG of Nd:YAG and Nd:YLF lasers, using either type I or type II interaction. LBO is a non-linear optical crystal perfectly suited for harmonic generation as well as sum frequency mixing and OPO applications using widely spread Nd lasers, Ti:Sapphire and Dye lasers. Such physical LBO properties as excellent optical homogeneity, non hygroscopicity and very high damage threshold assure long and stabile operation of crystal. LBO crystal is the first choice as harmonic generator of high peak power pulsed lasers.

Basic Properties

ATTRIBUTE	SPECIFICATIONS
CRYSTAL STRUCTURE	Orthohomic, Space group Pna21 Point group mm2
LATTICE PARAMETERS	a = 8.4473Å, a = 7.3788Å, c = 5.139Å, z = 2
MELTING POINT	About 834°C
MOHS HARDNESS	6
DENSITY	2.47 g/cm3
THERMAL CONDUCTIVITY	3.5W/m/K
THERMAL EXPANSION COEFFICIENT	ax=10.8x10-5/K  av=-8.8x10-5/k  az=3.4x10-5/K

Optical Properties

ATTRIBUTE	SPECIFICATIONS
TRANSPARENCY RANGE	160-2600nm
SHG PHASE MATCHABLE RANGE	551-2600nm(Type I) 790-2150(Type II)
REFRACTIVE INDICIES	1.0642um nx=1.5656, nv=1.5905, ne=1.6055 0.5321um nx=1.5785, nv=1.6065, ne=1.6212 0.2660um nx=1.5973, nv=1.6286, ne=1.6444
THERM-OPTIC COEFFICIENT (°C, Λ IN Μ M)	dnx/dT=-9.3X10-6 dny/dT=-13.6X10-6 dnz/dT=(-6.3-2.1 λ)X10-6
ABSORPTION COEFFICIENT	<0.1%/cm at 1664nm <0.3%/cm at 532nm
LBO COEFFICIENTS	deff(I)=d32cosφ (Type I in XY plane) deff(I)=d31cos2θ+d32sin2θ (Type I in XZ plane) deff(II)=d31cosθ (Type II in YZ plane) deff(II)=d31cos2θ+d32sin2θ (Type II in XZ plane)
NON-VANISHED LBO SUSCEPTIBILITIES	d31=1.05±0.09pm/V d32=-0.98±pm/V d33=0.05±0.006pm/V
SELLMEIER EQUATIONS (Λ IN Μ M)	nx2=2.454140+0.011249/( λ2-0.011350)-0.014591 λ2-6.60x10-5 λ4 ny2=2.539070+0.012711/( λ2-0.012523)-0.018540 λ2=2.0x10-4 λ4 nz2=2.586179+0.013099/( λ2-0.011893)-0.017968 λ2=2.26x10-4 λ4

Capabilities

Optical

ATTRIBUTE	COMMERCIAL	HIGH PRECISION
DIMENSION	30x30x30mm, 60mm
WAVEFRONT DISTORTION	λ/8	λ/8
ORIENTATION	±0.25°	±0.2°
END-FACES CONFIGURATION	Flat
DIMENSION TOLERANCE	±0.1mm	±0.01mm
SURFACE QUALITY	10-5 scratch and dig	10-5 scratch and dig
FLATNESS	λ/8	λ/10
PARALLELISM	20"	10"
PERPEDICULARITYY	15'	5'
INTRINSIC LOSS	Less than 0.1%/cm at 1064nm