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LBO Crystal
• Large aperture: max 20x20 mm
• Various size: max length 60 mm
• High transmittance: AR coating with R<0.1% (at 1064/532nm)
• End configuration: flat, or Brewster, or specified
• Mounting: upon request
• Very competitive price
LBO (LiB3O5) is a kind of non-linear optical crystal with good ultraviolet transmittance (210-2300 nm), high laser damage threshold and large effective frequency doubling coefficient (about 3 times of KDP crystal). So LBO is commonly used to produce high power second and third harmonic laser light, especially for ultraviolet lasers.
LBO has large band gap and transparency region, high non-linear coupling, good chemical and mechanical properties. These features make this crystal capable of optical parametric processes (OPO/OPA) and noncritical phase matching (NCPM), too.
WISOPTIC Standard Specifications* - LBO
Dimension Tolerance | ± 0.1 mm |
Angle Tolerance | < ± 0.25° |
Flatness | < λ/8 @ 632.8 nm |
Surface Quality | < 10/5 [S/D] |
Parallelism | < 20” |
Perpendicularity | ≤ 5' |
Chamfer | ≤ 0.2mm @ 45° |
Transmitted Wavefront Distortion | < λ/8 @ 632.8 nm |
Clear Aperture | > 90% central area |
Coating | AR coating or Broad Band AR-coating R<0.1% @ 1064 nm, R<0.1% @ 532 nm, R<0.5% @ 355 nm |
Laser Damage Threshold | > 10 GW/cm2 for 1064nm, 10ns, 10Hz (polished only) |
* Products with special requirement upon request. | |
Main Features - LBO
• Broad transparency range from 160 nm to 2.6 µm
• High optical homogeneity, free of inclusion
• Relatively large effective SHG coefficient (about three times that of KDP)
• Broad wavelength range of Type I and Type II non-critical phase matching (NCPM)
• Wide acceptance angle, small walk-off
• High laser damage threshold
Comparison of bulk damage threshold [1064nm, 1.3ns]
Crystals | Energy fluence (J/cm²) | Power density (GW/cm²) |
KTP | 6.0 | 4.6 |
KDP | 10.9 | 8.4 |
BBO | 12.9 | 9.9 |
LBO | 24.6 | 18.9 |
Primary Applications - LBO
• Either Type I or Type II frequency doubling (SHG) and sum frequency generation (SFG) of high peak power Nd-doped (Nd:YVO4, Nd:YAG, Nd:YLF), Ti:Sapphire, Alexandrite and Cr:LiSAF lasers
• Third harmonic generation (THG) of Nd-doped lasers
• Temperature-controllable non-critical phase matching (NCPM) for 1.0–1.3 µm
• Room temperature NCPM for Type II SHG at 0.8–1.1 µm
• Widely tunable OPO/OPA for both Type I and Type II phase matching
Physical Properties - LBO
Chemical formula | LiB3O5 |
Crystal structure | Orthorhombic |
Point group | mm2 |
Space group | Pna21 |
Lattice constants | a=8.46 Å, b=7.38 Å, c=5.13 Å, Z=2 |
Density | 2.474 g/cm3 |
Melting point | 835 °C |
Mohs hardness | 6 |
Thermal conductivity | 3.5 W/(m·K) |
Thermal expansion coefficients | αx=10.8x10-5/K, αy=-8.8x10-5/K, αz=3.4x10-5/K |
Hygroscopicity | Slightly hygroscopic |
Optical Properties - LBO
Transparency region | 155-3200 nm | |||
Refractive indices | 1064 nm | 532 nm | 355 nm | |
nx=1.5656 ny=1.5905 | nx=1.5785 ny=1.6065 | nx=1.5973 ny=1.6286 | ||
Linear absorption coefficients | 350~360 nm | 1064 nm | ||
α = 0.0031 /cm | α < 0.00035 /cm | |||
NLO coefficients (@ 1064 nm) | d31 = 1.05±0.09 pm/V, d32 = -0.98±0.09 pm/V, | |||
WISOPTIC Transmittance curve of LBO without coating
WISOPTIC Transmittance curve of LBO with AR coating @ 1064/532nm
