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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 dimension: 15x15x30mm
  • AR coatings at visible to 3300nm
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Dimension Maximum dimension 15x15x30mm 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 S/D
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 advantageous Nonlinear Optical Crystal for Optical Parametric Oscillation (OPO) application. It has impressive non-linear optical and electro-optical coefficients, drastic reduction of absorption in the 2.0-5.0 µm region, broad angular and temperature bandwidth, and low dielectric constants. Additionally worth mentioning, that compared with KTP, the damage threshold of KTA crystals is higher attributed to their low ionic conductivities, and the absorption in the 3-4μm wavelength range is lower than the former.

Hangzhou Shalom EO is capable to grow KTA crystals of crystal length from 0.1-30mm, and dimensions up to 15x15x30mm, with the superior surface quality of 10/5 Scratch/Dig, and AR coatings at visible to 3300nm.

Common Applications of KTA Crystals:

1. Excellent for Optical Parametric Oscillation (OPO) for MWIR output up to 4 micros.

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