Crystals Land

  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	1130±5°C
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/cm°C)	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.