ZnGeP2 Crystals

  • Chemical: ZnGeP2
  • Density: 4.162  g/cm3
  • Mohs Hardness: 5.5
  • Optical Class: Positive uniaxial
  • Userful Transmission Range: 2.0 um - 10.0 um
  • Thermal Conductivity   @ T= 293 K: 35 W/m∙K (⊥c)
    36 W/m∙K ( ∥ c)
  • Thermal Expansion @ T = 293 K to 573 K: 17.5 x 106 K-1 (⊥c)
    15.9 x 106 K-1 ( ∥ c)
  • Product Detail

    Technical parameters

    Test report


    Zinc Germanium Phosphide (ZGP) crystals possessing large nonlinear coefficients (d36=75pm/V). Our ZGP has wide infrared transparency range(0.75-12μm), useful transmission from 1.7um. ZGP also shows high thermal conductivity(0.35W/(cm·K)), high laser damage threshold (2-5J/cm2)and well machining property.

    ZnGeP2 (ZGP) crystal was called the king of infrared nonlinear optical crystals and it is still the best frequency conversion material for high power, tunable infrared laser generation. DIEN TECH offer high optical quality and large diameter ZGP crystals with extremely low absorption coefficient α < 0.03 cm-1(at pump wavelengths 2.0-2.1 µm). These properties enables ZGP crystal to be used to generate mid-infrared tunable laser with high efficiency through OPO or OPA processes.

    Applications of ZGP:

    • Second, third, and fourth harmonic generation of CO2-laser.

    • Optical parametric generation with pumping at a wavelength of 2.0 µm.

    • Second harmonic generation of CO-laser.

    • Producing coherent radiation in submillimeterrange from 70.0 µm to 1000 µm.

    • Generation of combined frequencies of CO2- and CO-lasers radiation and other lasers are working in the crystal transparency region.

    Orientation of ZGP:
    The standard ZGP crystal orientation is for type I phase matching at an angle of θ= 54° , which is suitable
    for use in OPO pumped at wavelengths between 2.05um and 2.1um to generate mid-infrared output
    between 3.0um and 6.0um.

    Custom orientations of our ZGP crystals are available on request.

    Basic Properties

    Chemical ZnGeP2
    Crystal Symmetry and Class Tetragonal, -42m
    Lattice Parameters a = 5.467 Å
    c = 12.736 Å
    Density 4.162 g/cm3
    Mohs Hardness 5.5
    Optical Class Positive uniaxial
    Userful Transmission Range 2.0 um – 10.0 um
    Thermal Conductivity @ T= 293 K 35 W/m∙K (⊥c) 36 W/m∙K ( ∥ c)
    Thermal Expansion @ T = 293 K to 573 K 17.5 x 106 K-1 (⊥c) 15.9 x 106 K-1 ( ∥ c)
    Technical Parameters
    Surface flatness PV<ʎ/4@632.8nm
    Surface quality S-D 20-10
    Wedge/Parallelism error <30 arc sec
    Perpendicularity <5 arc min
    Transparency range 0.75 – 12.0
    Non-linear coefficient d36= 68.9 (at 10.6 um),d36= 75.0 (at 9.6 um)