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LBO Crystal (Lithium Triborate Crystal)
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.
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.
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Comparison of Bulk Damage Threshold (@1053nm ,1.3ns)
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Crystal
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Energy Density (J/cm 2 )
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Power Density (GW/cm 2 )
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Ratio
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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
UPT offer LBO specification:
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Tolerance of dimension
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Dimension+/-0.1 mm，L：±0.1mm
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Flatness
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λ/8 @ 632.8nm
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Wavefront distortion
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<λ/4@ 632.8nm
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Surface quality
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10/5 per MIL-O-13830A
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Parallelism
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10″
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Perpendicularity
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5′
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Bevel/chamfer
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<0.1mm@45deg.
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Chips
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<0.1mm
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Angle Tolerance
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△θ≤±0.5°, △φ≤±0.5°
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Coating
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AR/HR/P- coating Upon request
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Warranty
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One year under proper use
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Note: OEM Dimension, different axis angle cutting and coating and damage threshold upon request, others are available upon request.
