KTA Crystal

  • Crystal Structure: Orthorhombic, Point Group mm2
  • Lattice Parameter: a=13.125Å, b=6.5716Å, c=10.786Å
  • Melting Point: 1130 ˚C
  • 1130 ˚C: near 5
  • Density: 3.454g/cm3
  • Thermal Conductivity: K1:1.8W/m/K;  K2: 1.9W/m/K;  K3: 2.1W/m/K
  • Product Detail

    Technical parameters


    Potassium Titanyle Arsenate (KTiOAsO4), or KTA crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. It has better non-linear optical and electro-optical coefficients, significantly reduced absorption in the 2.0-5.0 µm region, broad angular and temperature bandwidth, low dielectric constants. And its low ionic conductivities  result in higher damage threshold compared with KTP .
    KTA is often used as an OPO / OPA gain medium for emission in the 3µm range as well as an OPO crystal for eye-safe emission at high average power.
    Transparent between 0.5µm and 3.5µm
    High non-linear optical efficiency
    Large temperature acceptance
    Lower birefringence than KTP resulting in a smaller walk-off
    Excellent optical and non-linear optical homogeneity
    High damage threshold of AR-coatings: >10J/cm² at 1064nm for 10ns pulses
    AR-Coatings with low absorption at 3µm available
    Qualified for space projects

    Basic Properties

    Crystal Structure

    Orthorhombic, Point Group mm2

    Lattice Parameter

    a=13.125Å, b=6.5716Å, c=10.786Å

    Melting Point

    1130 ˚C

    Mohs Hardness

    near 5



    Thermal Conductivity

    K1:1.8W/m/K;  K2: 1.9W/m/K;  K3: 2.1W/m/K

    Optical and Nonlinear Optical Properties
    Transparency Range 350-5300nm
    Absorption Coefficients @ 1064 nm<0.05%/cm
    @ 1533 nm<0.05%/cm
    @ 3475 nm<5%/cm
    NLO Susceptibilities (pm/V) d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d24 = 3.2
    Electro-optical constants (pm/V)(low frequency) 33=37.5; 23=15.4; 13=11.5
    SHG Phase Matchable Range 1083-3789nm