Potassium Titanyle Arsenate(KTiOAsO4), or KTA crystal, 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:
-
Large nonlinear optical and electro-optical
coefficients
-
Wide angular bandwidth and small walk-off
angle
-
Broad temperature and spectral bandwidth
-
Low dielectric constants, loss tangent and ionic
conductivities (much less than that of KTP)
-
High damage threshold
Application:
-
Frequency Doubling (Second Harmonic Generation
SHG)
-
Sum and Difference Frequency Generation
(SFG)/(DFG)
-
Optical Parametric Oscillation
(OPO)
-
Electro-Optical Q-switch and modulation for Optical
waveguides
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 |
<10Å 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=13.125Å b=6.5716Å
c=10.786 Å |
Point group |
mm2 |
Hardness (Mohs) |
near 5 |
Hygroscopic susceptibility |
none |
Chemically |
stable |
Density |
3.454 g/cm3 |
Thermal conductivity
(mW/cm/°C) |
|
Ionic conductivity (room temperature, 10kHz) |
0.7 - 3.4.10-6 S/cm |
Optical and NLO Properties |
Transparency range |
0.35 - 5.3 µm |
Average refractive index |
1.8 |
Absorption |
@ 1064 nm <0.05 %/cm
@ 1533 nm <0.05 %/cm
@ 3475 nm <5%/cm |
NCPM Angle |
|
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 |
|
|
|