Nonlinear Optical Crystals: LBO

LBO crystals (Lithium Triborate Crystal) 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.

Advantages:

  • broad transparency range from 160nm to 2600nm (see Figure 1);
  • high optical homogeneity (δn≈10-6/cm) and being free of inclusion;
  • relatively large effective SHG coefficient (about three times that of KDP);
  • 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.
  • high damage threshold(18.9 GW/cm 2 for a 1.3ns laser at 1053nm); LBO has the highest damage threshold in all the commonly-used inorganic NLO crystals. Therefore, it is the best candidate for high average power SHG and other nonlinear optical processes.
Comparison of Bulk Damage Threshold (@1053nm ,1.3ns)
Crystal Energy Density (J/cm 2 ) Power Density (GW/cm 2 ) Ratio
KTP
KDP
BBO
LBO
6.0
10.9
12.9
24.6
4.6
8.4
9.9
18.9
1.00
1.83
2.15
4.10

LBO’s main applications

  • SHG, THG of Nd lasers
  • SHG of Ti:Sapphire, Cr:LiSAF and Alexandrite lasers
  • OPA and OPO

We offer LBO specification:

Tolerance of cutting angle △θ≤±0.25°,△φ≤±0.25°
Tolerance of dimension Dimension+/-0.1 mm,L:±0.1mm
Flatness λ/8 @ 632.8nm
Wavefront distortion λ/8@ 632.8nm
Surface quality 10/5  per MIL-O-13830A
Parallelism 10″
Perpendicularity 5′
Bevel/chamfer <0.1mm@45deg.
Chips <0.1mm
CA >95%
Coating AR/P-coating Upon customer’s request
Damage Threshold   750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz
Warranty         One year under proper use

 

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