LBO(Lithium Triborate) is an excellent NLO crystal discovered by the CAS team (Chinese Academy of Sciences) in 1990s’. Now the crystal elements are most commonly useful for high power and high reliable green and violet lasers. LNG Optics dedicates in developing LBO crystals with Very large dimensions, Very Low bulk absorption level and Very high laser damage threshold.
Features & Standard specifications from LNG Optics:
Dimensions: up to 100 x 100mm2
Length: 0.1mm thin plates or up to 80mm long rod
Orientation accuracy: ∆θ<±0.2°; ∆φ<±0.2°
Bilk absorption: less than 10ppm @ 1064 & 532nm
Flatness: λ/8 @ 633nm per inch
Wavefront Distortion: λ/8 @ 633nm
Surface Quality: 10/5 Scratch/Dig
Clear Aperture: 90% central area
Parallelism: 10 arc seconds
Perpendicularity: 5 arc minutes
Chamfers: 0.2mm x 45°+/-5°
AR Coatings: AR/AR 1064+532nm, R<0.2% or AR 355nm, R<0.2%
Damage Threshold, Coated: 1GW/cm2at 1064nm, 10ns pulse, 10Hz
Damage Threshold, Polished: 10GW/cm2at 1064nm, 10ns pulse, 10Hz
Physical & Chemical Properties:
|
Chemical Formula: |
LiB3O5 |
|
Crystal Structure: |
Orthorhombic, Space group Pna21, Point group mm2 |
|
Lattice Parameters (Å): |
a=8.4473, b=7.3788, c=5.1395, Z=2 |
|
Melting Point (°C): |
~ 834 |
|
Mohs Hardness: |
~ 6 |
|
Density (gram/cm3): |
2.47 |
|
Hygroscopic susceptibility: |
low |
|
Thermal Conductivity (W/m/K): |
3.5 |
|
Thermal Expansion Coefficient (K-1): |
αx=10.8x10-5, αy= -8.8x10-5, αz=3.4x10-5 |
Optical & Nonlinear Properties:
|
Transparency Range: |
160 - 2600 nm |
|
Phase Matching Range: |
551-2600nm for Type I, 790-2150nm for Type II |
|
Thermo-Optic Coefficients: (oC-1, λ in μm) |
dnx/dT = - 9.3 x 10-6 dny/dT = -13.6 x 10-6 dnz/dT = (-6.3 - 2.1λ) x 10-6 |
|
Sellmeier Equations: (λ in μm) |
n2x=2.4542+0.01125/(λ2-0.01135)-0.01388λ2 n2y=2.5390+0.01277/(λ2-0.01189)-0.01848λ2 n2z=2.5865+0.01310/(λ2-0.01223)-0.01861λ2 |
|
non-vanished Nonlinear susceptibilities: |
d31 = 1.05 ± 0.09 pm/V d32 = -0.98 ± 0.09 pm/V d33= 0.05 ± 0.006 pm/V |