Crystals Materials

LiNbO3 & MgO:LiNbO3 Crystal

for aerospace, medical, and industrial applications
mgo-linbo3-nonlinear-crystal
  • Electro-optical modulation
  • Q-switching
  • Laser frequency conversion of wavelengths >1 µm

    • Lithium niobate (LiNbO3 crystal) is widely used for SHG of wavelengths above 1000 nm and optical parametric amplification (OPA) of 1064nm pump light, and can also be used for quasi-phase matching. At the same time, lithium niobate crystals are also widely used in photoelectric regulators and waveguide materials, and used as Nd:YAG, Nd:YLF and Ti:sapphire laser Q switches. Pure LiNbO3 (LN) is a good candidate material for various optical devices, but has great drawbacks due to its low threshold optical damage. MgO:LiNbO3 increasing the threshold laser beam intensity by a factor of 100.

    Specifications of LiNbO3 & MgO:LiNbO3 Crystal

    Thickness/Diameter Tolerance ±0.05 mm
    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 LiNbO3
    Crystal Structure trigonal, R3C
    Lattice Constant a=b=5.148 Å, c=13.863 Å
    Density 4.64 g/cm3
    Melting Point About 1140°C
    Hardness (Mohs) 5
    Thermal Conductivity (W/m/k@25°C) 5.6 W/m/K
    Thermal Expansion Coefficients a11 =15.4x10-6/K a33 =7.5x10-6/K
    Refractive Indices n0 = 2.286 ne = 2.203 @632.8 nm

    Optical and Nonlinear properties

    Effective NLO coefficients deff =5.7 pm/V for frequency doubling 1300 nm; deff =5.3 pm/V for OPO pumped at 1064 nm; deff =17.6 pm/V for quasi-phase-matched structure.
    NLO Coefficients d33 = 34.4 pm/V; d31 = d15 = 5.95 pm/V; d22 = 3.07 pm/V
    Photorefractive Damage Threshold 50
    Electro-optic coefficients γT33 = 32 pm/V, γs33 = 31 pm/V; γT31 = 10 pm/V, γs31 = 8.6 pm/V; γT22 = 6.8 pm/V, γs22 = 3.4 pm/V
    Surface Damage Threshold 300 MW/cm2 (10 ns, 1064 nm)

    Stock specification list

    If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
    Part Number Size Theta, θ Phi, φ Doping Coating S1/S2
    MgO-LN-Cry-001 5*5*20 mm 42.9 0 5% AR/AR(R < 1%)@2091 + 1045 nm
    MgO-LN-Cry-002 5*5*20 mm 64.2 0 5% AR/AR(R < 1%)@2091 + 1045 nm + 697 nm
    MgO-LN-Cry-002 10*10*2 mm 44.1 0 5% Uncoating

    Notes

  • 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.
  • LiNbO3 & MgO:LiNbO3 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 LiNbO3 & MgO:LiNbO3 is small.

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