KTA Crystal 

KTA crystal or Potassium Titanyle Arsenate(KTiOAsO4),  is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) Application.  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.

Advantage:

Application:

Main Specifications:

Diameter Tolerance

0.1mm

Parallelism better than 30 arc second
Perpendicularity better than 30 arc min
Surface Quality

10/5

Flatness

l/10@633nm

Roughness <10 Rms
Orientation

q < 0.5, f < 0.5

Clear Aperture

> 90% central area

Transmitted Wavefront Distortion

Less than l/8@633nm

Coating

AR Coating Available

Physical and Chemical Properties:

Formulation  KTiOAsO4 
Crystal structure Orthorhombic 
Lattice parameters a=13.125     b=6.5716     c=10.786
Point group mm2
Hardness (Mohs)  near 5
Hygroscopic susceptibility none 
Chemically  stable 
Density  3.454 g/cm
Thermal conductivity
(mW/cm/C)

K1

K2 K3

18

19

21

Ionic conductivity (room temperature, 10kHz)

0.7 - 3.4.10-6 S/cm 

Optical and Nonlinear Optical Properties:

Transparency range 0.35 - 5.3 m
Average refractive index 1.8
Absorption @ 1064 nm <0.05 %/cm 
@ 1533 nm <0.05 %/cm 
@ 3475 nm <5%/cm 
NCPM Angle
q j
90
Wavelength
Pump  Signal  Idler 
1064 nm 1533 nm 3475 nm 
Electro-optical constants
(low frequency)
r33 r23 r13
37.5 pm/V 15.4 pm/V 11.5 pm/V 

 

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