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  • KTA Crystals
  • KTA Crystals

KTA Crystals

  • Large nonlinear and E-O coefficients
  • Lower absorption in the 3-4μm range than KTP
  • High damage threshold
  • Maximum size: 15x15x30mm
  • AR coating from visible to 3300nm
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Maximum Length 30mm(Aperture-15x15mm) Dimensional Tolerance (W+/-0.1mm)x(H+/-0.1mm)x(L+0.2/-0.1mm)
Wavefront Distortion <Lambda/8@633nm Chamfer <0.15mm x 45°
Perpendicularity < 5 arc min Parallelism <15 arc sec
Flatness <Lambda/10 @ 633nm Surface Quality 10/5
AR Coating From visible to 3.3μm


Basic Properties:

Crystal Structure Orthorhombic, point group mm2 Lattice Parameter a=13.125Å, b=6.5716Å, c=10.786Å
Melting Point 1130℃ Mohs Hardness Near 5
Density 3.454g/cm3 Thermal Conductivity K1:1.8W/m/K; K2: 1.9W/m/K;
K3: 2.1W/m/K


 Optical and Nonlinear Properties:

Transparency Range 350-5300nm
Absorption Coefficients @ 1064nm <0.05 %/cm 
@ 1533nm <0.05 %/cm 
@ 3475nm <5%/cm
NLO susceptibilities(pm/V) d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d15 = 3.2
Index A B C D
Sellmeier Equation
Ni2=Ai+Biλ2/(λ2-Ci2)-Diλ2(λ in μm)
Nx 1.90713 1.23522 0.19692 0.01025
Ny 2.15912 1.00099 0.21844 0.01096
Nz 2.14768 1.29559 0.22719 0.01436
Electro-optical constants(pm/V)
(low frequency)
SHG Phase Matchable Range 1083-3789nm


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. 
Crystal length from 0.1-30mm, size up to 15x15x30mm 
AR coating from visible to 3300nm

Application Notes:

  1. Excellent for Optical Parametric Oscillation (OPO)
  2. Second Harmonic Generation – SHG@1.083μm-3.789μm
  3. Sum and Difference Frequency Generation (SFG and DFG)
  4. Electro-optical Q-switch and modulation