Lithium triborate (LBO) is a nonlinear optical crystal, which has the characteristics of wide light transmission range, wide acceptance angle, small walk-off angle, and the highest damage threshold among ordinary nonlinear crystals. Alfa Chemistry can supply all types of LBO crystals required.
Request bulk or custom formats
Catalog Number
ACMA00027365
Product Name
THG@1064nm LBO Crystals, 3mm*3mm*15mm
DimensionTolerance
W±0.1mm/H±0.1mm/L±0.2mm
Coating
AR/AR @ 1064 + 532/355 nm
Perpendicularity
< 5 arcmin
Angle Tolerance
< 30 arcmin
ApertureTolerance
± 0.1 mm
Surface Quality
10/5 scratch & dig
ClearAperture
90% of full aperture
Crystal Structure
orthorhombic, mm2
Lattice Parameters
a = 8,46 Å, b = 7,38 Å , c = 12,717 Å
Optical Symmetry
Negative biaxial
Optical Homogeneity
∂n = 10-6 cm-1
Transparency Region
(at “0” transmittance level) 155~3200 nm
Absorption Coefficient
<0.1%/cm (at 1064 nm)
Refractive Indices
at 1064 nm, nx=1.5656, ny=1.5905, nz=1.6055
at 532 nm, nx=1.5785, ny=1.6065, nz=1.6212
at 355 nm, nx=1.5971, ny=1.6275, nz=1.6430
Phase Matching Range
Type 1 SHG, 554~2600 nm
Type 2 SHG, 5790~2150 nmnm
Walk Off Angle
7 mrad (Type 1 SHG 1064 nm)
Angular Acceptance
6.4 K×cm (Type 1 SHG 1064 nm)
Thermal Acceptance
6.5 mrad×cm (Type 1 SHG 1064 nm)
248 mrad×cm (Type 1 NCPM SHG 1064 nm)
NLO Coefficients
(at 1064nm) d31 = (1.05±0.09) pm/V, d32 = -(0.98±0.09) pm/V, d33 = (0.05±0.006) pm/V
Effective NLO Expressions
XY plane, dooe = d32 cosφ
YZ plane, doeo = deoo = d31 cosθ
Expansion Coefficient
(Thermal expansion coefficient)
αx = 10.8 × 10-5K-1
αy = -8.8 × 10-5K-1
αz = 3.4 × 10-5K-1
Sellmeier Equations
nx2=2.4542+0.01125/(λ2-0.01135)-0.01388 λ2
ny2=2.5390+0.01277/(λ2-0.01189)-0.01849 λ2+4.3025×10-5λ4-2.9131×10-5λ6
nz2=2.5865+0.01310/(λ2-0.01223)-0.01862 λ2+4.5778×10-5λ5-3.2526×10-5λ6
LBOs have several unique properties:
1. Wide transparent area
2. Wide Type 1 and Type 2 Non-Critical Phase Matching (NCPM) Range
3. Small walk-off angle
4. High damage threshold
5. Wide acceptance angle
6. High optical uniformity
The most common applications include high-power near-infrared wavelength second-harmonic generation, sum-frequency generation for visible-UV laser generation, and optical parametric oscillators for wide tuning in the visible and near-infrared.