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* Welcome To KTA Crystal *
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KTA ( KTiAsO4)

 Physical Properties:

Crystal Structure

Orthorhombic,pna21,mm2

Lattice Parameters

a=1.312nm,b=0.656nm, c=1.0798nm,

Density

3.45 g/cm3

Melting Point

11305C

Ferroelectric transition temperature (C)

880

Ionic conductivity (room temperature, 10kHz),s/cm

0.7-3.4 x 10^6

Absorption coefficient @1064nm

<0.1%/cm

Hygroscopic susceptibility

No

Dielectric constant:

ε33=42

Thermal conductivity (mw/cmC)

k1=18,k2=19,k3=21

 

 Optical Properties:

Transmitting range:

0.35-5.3um

Refractive indices(@ 1064 nm):

 

nx=1.782

ny=1.790,

nz=1.868,

Sellmeier equations:

Ni^2=Ai+Biλ^2/(λ^2-Ci^2)-Diλ^2

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

Phase matching range(nm):

1075-1134nm

Nonlinear Coefficients: (pm/v)

d15 =2.3

d24 =3.2

d31 =2.8

d32 =4.2

d33 =16.2

Electro-optic coefficients(low frequency, pm/v):

r13=11.5

r23=15.4

r33=37.5

damage threshold(10 ns pulse):

at 1064 nm

 

15J/cm^2

 

Specification:

Dimension tolerance:

0.1mm

Flatness:

<l/8 @633nm

Surface quality: Scratch/Dig

10/5

Parallelism:

better than 30 arc sec.

Perpendicularity:

better than 30 arc min

Angle tolerance:

q < 0.5,f < 0.5

AR coating:

AR coatings

Clear aperture:

>90% central area

Transmitting wave front distortion:

less than l/8 @ 633nm

 

 Applications:

An excellent NLO crystal developed mainly for Optical Parametric Oscillation (OPO)

Large non linear coefficients, broad angular and temperature bandwidth.

Low dielectric constants, low ionic conductivities.

Lower absorption in the 3-4 μm spectrum range than KTP.

Highly resistant to high intensity laser radiation.

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