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LBO Crystal  

Lithium Triborate (LBO) Crystals

LBO (LiB3O5) is an excellent non-linear optical crystal. It’s 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:

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:

Transparency Range

160-2600nm

SHG Phase Matchable Range

551-2600nm(Type I) 790-2150(Type II)

Refractive Indices

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

Dimensions

Large crystal size up to30x30x30mm3 and maximum length of 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

 

Coating:

        > DBAR, Nd:YAG Laser
        > Lower reflection, R<0.2% at 1064nm, R<0.5% at 532nm
        > High damage threshold, >500MW/cm2 at both wavelengths 1064nm and 532nm
        > High efficiency
        > BBAR, Tunable Laser
        > Customer designed coating

   
 

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