Crystals Materials
LBO Crystal for aerospace, medical, and industrial applications
  • Wide transparency region
  • Broad Type 1 and Type 2
  • Non-critical phase-matching (NCPM) range
  • Small walk-off angle
  • High damage threshold
  • Wide acceptance angle
  • High optical homogeneity
  • Lithium Triborate (LiB3O5 or LBO) is a type of nonlinear crystal that is commonly used in the generation of high-power laser radiation. It has a high damage threshold and a broad transparency range from the ultraviolet to the near-infrared region, making it suitable for a variety of laser applications.

    LBO crystal is a negative biaxial crystal, with the main axes X, Y, and Z (nz>ny>nx) parallel to the crystallographic axes a, c, and b respectively.

    Specifications of LBO Crystal
    Thickness/Diameter Tolerance ±0.05 mm
    Cutting angleTole rance △θ≤±0.25°, △φ≤±0.25°
    Orientation Tolerence < 0.5°
    Size 3 mm ~ 150 mm or Upon customer request
    Dimension Tolerances ±0.05 mm
    Surface Quality 10/5 S/D per MIL-O-13830A
    Parallelism < 10 arcsec
    Perpendicularity < 5 arcmin
    Clear Aperture > 90%
    Wavefront Distortion λ/8 @ 633 nm
    Surface Flatness < λ/8 @ 632.8 nm
    Chamfer < 0.1 mm @ 45°
    Coating AR/HR/PR coating upon customer's request
    Physical and chemical properties
    Chemical Formula LiB3O5
    Crystal Structure Orthorhombic, Space group Pna21, Point group mm2
    Lattice Constant a=8.4473Å ,b=7.3788Å, c=5.1395Å, Z=2
    Density 2.47 g/cm3
    Melting Point About 834°C
    Thermal Conductivity (W/m/k@25°C) 3.5W/m/K
    Thermal Expansion Coefficients αx=10.8×10-5/K, αy=-8.8×10-5/K,αz=3.4×10-5/K
    Hardness (Mohs) 6
    Birefringence negative biaxial
    Optical and Nonlinear properties
    Transparency Range 160 nm - 2600 nm
    SHG Phase Matchable Range 551-2600 nm (Type I),
    790-2150 nm (Type II)
    Therm-optic Coefficient (/℃, λ in μm) dnx/dT=-9.3x10-6;
    Absorption Coefficients < 0.1%/cm(@1064 nm),
    <0.3%/cm(@532 nm)
    Angle Acceptance 6.54mrad·cm (φ, Type I, 1064 SHG); 15.27mrad·cm (θ, Type II,1064 SHG)
    Temperature Acceptance 4.7℃·cm (Type I, 1064 SHG); 7.5℃·cm (Type II, 1064 SHG)
    Spectral Acceptance 1.0 nm·cm (Type I, 1064 SHG); 1.3 nm·cm (Type II, 1064 SHG)
    Walk-off Angle 0.60° (Type I 1064 SHG); 0.12° (Type II 1064 SHG)

    Stock specification list

    If need other specifications and quantities products, please contact us(
    Part Number Size Theta, θ Phi, φ Coating S1/S2 Application
    LBO-Cry-001 3x3x10 mm 90 11.6 AR/AR@1064+532 nm SHG@1064 nm
    LBO-Cry-002 3x3x20 mm 90 0 AR/AR@1064+532 nm NCPM SHG@1064,T=149°C
    LBO-Cry-003 5x5x15 mm 42.2 90 AR/AR@1064+532/355nm SHG@1064 nm


  • AR/HR/PR coatings are available at your specified wavelength.
  • Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
  • LBO is relatively soft and therefore requires precautions to protect its polished surfaces.
  • When angle adjusting is necessary, keep in mind that the acceptance angle of LBO is small.
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