LBO LBO (LiB3O5 or Lithium Triborate) is a nonlinear optical crystal. For frequency doubling (SHG)/tripling (THG) of Nd:YAG, Nd:YLF, Nd:YVO4 lasers, LBO crystal is one of the most useful nonlinear optical material in ultraviolet and visible laser applications. ADVANTAGES ● broad transparency range from 160nm to 2600nm ● high optical homogeneity ( δn≈10-6) 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
Standard LBO
Dimension(mm) | θ(Deg) | φ(Deg) | Coating | Application |
3*3*10 | 42.2 | 90 | AR/AR@1064&532/355nm | THG@1064,TypeⅡ |
3*3*10 | 90 | 11.6 | AR/AR@1064&532nm | SHG@1064,TypeⅠ |
3*3*15 | 42.2 | 90 | AR/AR@1064&532nm | THG@1064,TypeⅡ |
5*5*15 | 42.2 | 90 | AR/AR@1064&532/355nm | THG@1064,TypeⅡ |
5*5*15 | 90 | 11.6 | AR/AR@1064&532nm | SHG@1064, TypeⅠ |
Specification
Apertures | up to 30 x30mm |
Length | up to 50mm |
Dimension Tolerance | (W ±0.1mm) x (H ±0.1mm) x (L +0.2mm/-0.1mm) |
Flatness | λ/8 @ 633nm |
Scratch/Dig | 10-5@MIL-0-13830A |
Parallelism | <20 arc seconds |
Perpendicularity | <5 arc minutes |
Clear Aperture | ≥95% central area |
Properties
Crystal Structure | Orthorhombic, Space group Pna21, Point group mm2 |
Lattice Parameters | a=8.4473 Å, b=7.3788 Å, c=5.1395 Å, Z=2 |
Melting Point | About 834°C |
Mohs Hardness | 6 |
Density | 2.47g/cm3 |
Thermal Conductivity | 3.5 W/m/K |
Thermal Expansion Coefficient | αx=10.8x10-5/K, αy= -8.8x10-5/K, αz=3.4x10-5/K |
TransparencyRange | 160 - 2600 nm |
SHG Phase Matching Range | 551-2600nm for Type I, 790-2150nm for Type II |
Thermo-Optic Coefficients | dnx/dT = - 9.3 x 10-6℃-1, λ in μm |
dny/dT = -13.6 x 10-6℃-1, λ in μm | |
dnz/dT = (-6.3+2.1λ) x 10-6℃-1, λ in μm | |
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 | |
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 |
