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 .

Basic Properties:

Crystal Structure
Orthorhombic, Point Group mm2
Lattice Parameter
a=13.125Å, b=6.5716Å, c=10.786Å
Melting Point
1130 ˚C
Mohs Hardness
near 5
Thermal Conductivity
K1:1.8W/m/K;  K2: 1.9W/m/K;  K3: 2.1W/m/K

Optical and Nonlinear Optical Properties:

  • Transparency Range: 350-5300nm

  • Absorption Coefficients: @ 1064 nm<0.05%/cm 

                                        @ 1533 nm<0.05%/cm 

                                        @ 3475 nm<5%/cm

  • NLO Susceptibilities (pm/V): d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d24 = 3.2

  • Electro-optical constants (pm/V) (low frequency): 33=37.5; r23=15.4; r13=11.5

  • SHG Phase Matchable Range: 1083-3789nm