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KTA Crystal

  Description Potassium Titanyle Arsenate(KTiOAsO4), or KTA crystal,  is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) Applications. OPO devices based on KTAs are reliable, solid state sources of tunable laser radiation exhibiting energy conversion efficiencies above 50%.  In addition KTA has a very high damage threshold.  

In comparison to KTP, KTA crystals feature large non-linear optical and electro-optical coefficients and have significantly reduced absorption in the 2.0 - 5.0 mm range.  Its low dielectric constants, low loss tangent and ionic conductivities are orders of magnitude less than that of KTP.
  Applications Frequency Doubling (Second Harmonic Generation SHG)
    Sum and Difference Frequency Generation (SFG)/(DFG)
    Optical Parametric Oscillation (OPO)
    Electro-Optical Q-switch and modulation for Optical waveguides
  Features Large nonlinear optical and electro-optical coefficients
    Wide angular bandwidth and small walk-off angle
    Broad temperature and spectral bandwidth
    Low dielectric constants, loss tangent and ionic conductivities (much less than that of KTP)
    High damage threshold
    Non-hygroscopic crystal
Main Specification Material KTiOAsO4 
Orientation accuracy of cut angle <30 arc min
Non-critical Phase matching angle θ and φ q 90°
j  0° 
Coating AR Coating Available
Dimension tolerance +0/-0,1 mm Length +0/-0,1
Flatness l/10 @633nm
Surface quality 10/5
Parallelism <30 arc sec
Perpendicularity < 30 arc min
Transmitting Wavefront distortion l/8@633nm
Clear aperture > 90% central area
Physical Properties Crystal Structure Orthorhombic, Point group mm2
Cell Parameters a=13.125Å     b=6.5716Å     c=10.786 Å
Melting Point 1130
Hardness ~5
Density 3.454 g/cm3 
Absorption Coefficient @ 1064 nm <0.05 %/cm 
@ 1533 nm <0.05 %/cm 
@ 3475 nm <5%/cm 
Hygroscopic Susceptibility None
Thermal Conductivity

Linear Optical Properties Transparency Range 350-5300nm
Average refractive index 1.8
Sellmeier Equations Ni2=Ai+Biλ2/(λ2-Ci2)-Diλ2(λ in um)

Nonlinear Optical Properties SHG Phase-matchable range 1083-3789nm
Wavelength Pump 1064 nm
Signal 1533 nm
Idler   3475 nm 
Non-vanished NLO susceptibilities d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d15 = 3.2
Electro-optical constants
(low frequency)
r33=37.5 pm/V
23=15.4 pm/V
13=11.5 pm/V 
Optical damage threshold >1,5GW/cmfor 10ns pulses @ 1064 nm