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lbo crystal
lbo crystal

LBO Laser Crystals

LBO crystals is an excellent nonlinear crystal. For frequency doubling(SHG),tripling(THG) of Nd:YAG,Nd:YLF,Nd:YVO4 lasers, it is one of the most useful nonlinear optical materials in ultraviolet and visible laser applications.

Applications of LBO Laser Crystals


  • SHG, THG

  • OPA and OPO


Advantages of LBO Laser Crystals


  • Broad transparency range from 160nm to 2600nm

  • High optical homogeneity (δn≈10-6/cm) and free of inclusion

  • Large effective SHG coefficient

  • Wide acceptance angle and small walk-off

  • Type I and type II non-critical phase matching (NCPM) in a wide wavelength range

  • High damage threshold(18.9 GW/cm 2 for a 1.3ns laser at 1053nm)

  • Spectral NCPM near 1300nm


Specifications of LBO Laser Crystals


Tolerance of cutting angle

△θ≤±0.25°,△φ≤±0.25°

Tolerance of dimension

Dimension+0/-0.1 mm,L:±0.1mm

Flatness

λ/10 @ 632.8nm

Wavefront distortion

λ/8@ 632.8nm

Surface quality

10/5 per MIL-O-13830A

Parallelism

20″

Perpendicularity

5′

Clear Aperture:

> 90%

Chamfer:

< 0.1 mm @ 45°

Size

Upon customer request

Coating

AR/PR coating upon customer’s request

Damage Threshold

750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz

Quality Warranty Period

One year under proper use


Optical and Nonlinear Properties of LBO Crystal


Transparency Range

160-2600nm

SHG Phase Matchable Range

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

Therm-optic Coefficient (/℃, λ in μm)

dnx/dT=-9.3x10^-6
dny/dT=-13.6x10^-6
dnz/dT=(-6.3-2.1λ)x10^-6

Absorption Coefficients

<0.1%/cm at 1064nm <0.3%/cm at 532nm

Angle Acceptance

6.54mrad·cm (φ, Type I,1064 SHG)
15.27mrad·cm (θ, Type II,1064 SHG)

Temperature Acceptance

4.7℃·cm (Type I, 1064 SHG)
7.5℃·cm (Type II, 1064 SHG)

Spectral Acceptance

1.0nm·cm (Type I, 1064 SHG)
1.3nm·cm (Type II, 1064 SHG)

Walk-off Angle

0.60° (Type I 1064 SHG)
0.12° (Type II 1064 SHG)

NLO 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 NLO susceptibilities

d31=1.05± 0.09 pm/V
d32= -0.98± 0.09 pm/V
d33=0.05± 0.006 pm/V

Sellmeier Equations (λ in μm)

nx²=2.454140+0.011249/(λ²-0.011350)-0.014591λ²-6.60×10^-5λ4
ny²=2.539070+0.012711/(λ²-0.012523)-0.018540λ²+2.00×10^-4λ4
nz²=2.586179+0.013099/(λ²-0.011893)-0.017968λ²-2.26×10^-4λ4


Physical Properties of LBO crystal


Crystal Structure

Orthorhombic, Space group Pna21, Point group mm2

Lattice Parameter

a=8.4473Å, b=7.3788Å, c=5.1395Å, Z=2

Melting Point

About 834℃

Mohs Hardness

6

Density

2.47g/cm3

Refractive indices

nX= 1,5656; nY= 1,5905; nZ= 1,6055 @1064 nm

Thermal Conductivity

3.5W/m/K

Thermal Expansion Coefficients

αx=10.8x10^-5/K, αy=-8.8x10^-5/K,αz=3.4x10^-5/K


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