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Potassium Titanyle Arsenate - KTA Crystals

Potassium titanyle arsenate (KTiOAsO4), or KTA, is a nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. It has good non-linear optical and electro-optical properties, e.g. significantly reduced absorption in band range of 2.0-5.0 µm , broad angular and temperature bandwidth, low dielectric constants.

Primary KTA crystals applications:

  • OPO for mid IR generation – up to 4 µm;
  • Sum and Difference Frequency Generation in mid IR range;
  • Electro-optical modulation and Q-switching;

EKSMA OPTICS offers:

  • KTA crystals size up to 15x15x30 mm;
  • AR and BBAR coatings for VIS-IR and mid IR ranges;
  • Standard and customized mounts and housings;
  • Technical consulting.
SPECIFICATIONS
Flatness  λ/8@633 nm
Parallelism > 20 arc sec
Surface quality 
10/5 Scratch/Dig (MIL-PRF-13830B)
Perpendicularity 
> 15 arc min
Angle tolerance < ± 0.2°
Aperture tolerance:
± 0.1 mm
Clear aperture 
>90% central area
Transmitting wavefront distortion less than λ/8@633 nm

PHYSICAL PROPERTIES
Crystal structure orthorhombic
Point group mm2
Space group
Pna21
Lattice constants, Å a = 13,125, b = 6,5716, c = 10,786
Density, g/cm3 3,45
Melting point, °C
1130
Mohs hardness
5
Thermal conductivity, W/m*K k1=1.8, k2=1.9, k3=2.1
Not hygroscopic
 

NONLINEAR & OPTICAL PROPERTIES
Transparency
350–5300 nm
Wavelength dispersion of refractive indices
nx2=1.90713+1.23522*λ2/ (λ2-0.196922)-0.01025* λ2
ny2=2.15912+1.00099*λ2/ (λ2-0.218442)-0.01096* λ2
nz2=2.14768+1.29559*λ2/ (λ2-0.227192)-0.01436* λ2
Electro optical constants r33=37.5 pm/V
r23=15.4 pm/V
r13=11.5 pm/V
Effective nonlinearity   
x-y plane deoe = doee = d15sin2φ + d24cos2φ
x-z plane doeo = deoo = d24sinθ
  d31=2.3 pm/V
d32=3.66 pm/V
d33=15.5 pm/V
d24=3.64 pm/V
d15=2.3 pm/V
Damage threshold >500 MW/cm2 for pulses λ=1064 nm, τ=10ns, 10Hzm TEM00
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