Lithium Triborate (LBO) Crystal
TGG is an excellent magneto-optical crystal used in various Faraday devices (Rotator and Isolator) in the range of 400nm-1100nm,excluding 475-500nm.It has large magneto-optical constant,low light loss, high thermal conductivity
and high laser damage threshold. It is widely used in multi-stage amplification, ring type and seed injection lasers such as YAG and Ti-doped sapphire.
Basic Properties
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Crystal Structure
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Orthohomic, Space group Pna21 Point group mm2
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Lattice Parameters
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a = 8.4473Å, a = 7.3788Å, c = 5.139Å, z = 2
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Melting Point
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About 834℃
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Mohs Hardness
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6 |
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Density
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2.47 g/cm3
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Thermal Conductivity
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Thermal Conductivity
3.5W/m/K
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Thermal Expansion Coefficient
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ax=10.8x10-5/K
av=-8.8x10-5/k
az=3.4x10-5/K
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Optical Properties
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Transparency Range
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160-2600nm
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Shg Phase Matchable Range
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551-2600nm(Type I) 790-2150(Type II)
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Refractive Indicies
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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
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Therm-Optic Coefficient(℃ , Λ In Μ M)
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dnx/dT=-9.3X10-6
dny/dT=-13.6X10-6
dnz/dT=(-6.3-2.1 λ)X10-6
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Absorption Coefficient
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<0.1%/cm at 1664nm
<0.3%/cm at 532nm
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Lbo Coefficients
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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)
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Non-Vanished Lbo Susceptibilities
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d31=1.05±0.09pm/V
d32=-0.98±pm/V
d33=0.05±0.006pm/V
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Sellmeier Equations (Λ In Μ M)
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nx2=2.454140+0.011249/( λ2-0.011350)-0.014591 λ2-6.60x10-5λ4
ny2=2.539070+0.012711/( λ2-0.012523)-0.018540 λ2=2.0x10-4λ4
nz2=2.586179+0.013099/( λ2-0.011893)-0.017968λ2=2.26x10-4λ4 |
