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LBO　非線形(NLO)結晶

Lithium Triborate (LiB3O5, LBO)

LBO　非線形(NLO)結晶Lithium Triborate (LiB3O5 or LBO) is an excellent nonlinear optical crystal discovered and developed by FIRSM, CAS (Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences). Fujian CASTECH Crystals, Inc. (CASTECH) has the exclusive rights to produce, manufacture and market the patented LBO crystal and its NLO devices. The patent number is 4,826,283 in USA, 2023845 in Japan and 88 1 02084.2 in China.

CASTECH's LBO is featured by

  • broad transparency range from 160nm to 2600nm (see Figure 1);
  • high optical homogeneity (dn»10-6/cm) and being free of inclusion;
  • relatively large effective SHG coefficient (about three times that of KDP);
  • high damage threshold;
  • wide acceptance angle and small walk-off;
  • type I and type II non-critical phase matching (NCPM) in a wide wavelength range;
  • spectral NCPM near 1300nm.

CASTECH offers LBO of

  • strict quality control;
  • large crystal size up to 30x30x30mm3 and maximum length of 60mm;
  • AR-coating, mounts and re-polishing services;
  • a large quantity of crystals in stock;
  • fast delivery(10 days for polished only, 15 days for AR-coated).

Chemical and Structural properties of LBO

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          2.47 g/cm3
Thermal Conductivity   3.5W/m/K
Thermal Expansion Coefficient ax=10.8x10-5/K, ay= -8.8x10-5/K, az=3.4x10-5/K

Optical and Nonlinear Optical Properties of LBO

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  Coefficient <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)-0.014591λ2-6.60x10-5λ4
ny2=2.539070+0.012711/(λ2-0.012523)-0.018540λ2+2.0x10-4λ4
nz2=2.586179+0.013099/(λ2-0.011893)-0.017968λ2-2.26x10-4λ4

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