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:
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) |
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| Ionic conductivity (room temperature, 10kHz) |
0.7 - 3.4.10-6 S/cm |
Optical and Nonlinear Optical 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 |
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| NCPM Angle |
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| Wavelength |
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| Electro-optical constants (low frequency) |
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