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KTiOAsO4 or KTA Crystal

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.

Table 1: Basic properties

Crystal Structure

Orthorhombic, point group mm2,

Lattice parameter

a=13.125À, b=6.5716À, c=10.786À

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

 

Table 2．Optical and Nonlinear Optical Properties

TransparencyRange

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, d15 = 3.2

Sellmeier Equation

Ni2=Ai+Biλ2/(λ2-Ci2)-Diλ2(λin um)

index

A

B

C

D

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)

γ33=37.5; γ23=15.4; γ13=11.5

SHG Phase Matchable Range

1083-3789nm

 

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