KTA

KTA
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KTiOAsO4 (Potassium Arsenate Titanium Oxide) crystal is an excellent nonlinear material, one of the KTP crystals. Compared with KTP, KTA has the following characteristics: 

  • A larger nonlinear optical coefficient
  • Wider angle and temperature-matching bandwidth
  • Can be pumped with Nd: YAG (1064 nm) laser
  • Can achieve non-critical phase matching
  • Has lower electrical conductivity and ionic conductivity than KTP crystal 

The high thermal conductivity of KTA is suitable for high frequency and high energy mid-infrared output because it does not produce a thermal lensing effect during high-power laser pumping. The absorption loss of KTA in the spectral range of 3000 nm~5000 nm is much lower than that of KTP crystal. 

The absorption loss of KTA is much lower than that of KTP crystal in the spectral range from 3000 nm to 5000 nm (solving the absorption peak problem of KTP crystal near 3.4 μm). It has a relatively high resistance to optical damage, widely used in optical parametric oscillators (OPO) in the mid-infrared.

Features of KTiOAsO4

  • High damage threshold
  • Wide angle and temperature bandwidth
  • Low dielectric constant and ionic conductivity
  • 3.0-4.0um band has less stable absorption performance
  • Large nonlinear optical and electro-optical coefficients and high conversion efficiency
  • The antireflective film from visible light to 3300nm can be plated
  • Large size crystals can be provided, and the maximum size can reach 10x10x30 mm3  or 5×5×35mm3

Physicochemical Properties

AttributeNumerical
Chemical FormulaKTiOAsO4
Crystal StructureOrthorhombic System, Point Groupmm2
Lattice Parametersa=13.125Å, b=6.5716Å, c=10.786Å
Melting Point1130 ˚C
Mohs HardnessClose to the 5
Density3.454g/cm3
Coefficient of Thermal ConductivityK1:1.8W/m/K;  K2: 1.9W/m/K;  K3: 2.1W/m/K

Nonlinear Optical Properties

NLO (pm/V)Polarizationd31= 2.76
d32 = 4.74
d33 = 18.5
d15 = 2.3
d24 = 3.2
Electro-optic Constants (pm/V) (Low Frequency)r33=37.5；
r23=15.4；
r13=11.5
SHG Phase Matching Range1083-3789nm

Linear Optical Properties

Transmission Range350-5300nm
Absorption Coefficient@ 1064 nm<0.05%/cm
@ 1533 nm<0.05%/cm
@ 3475 nm<5%/cm
Sellmeier EquationRefractive IndexABCD
Ni2=Ai+Biλ2/(λ2-Ci2)-Diλ2 (λ in μm)nx1.907131.235220.196920.01025
ny2.159121.000990.218440.01096
nz2.147681.295590.227190.01436

Spectrum

KTA nonlinear crystal phase matchingKTA nonlinear crystal phase matching 2
KTA nonlinear crystal transmission

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