Potassium titanyl arsenate, KTA, is a nonlinear material for optical parametric oscillation, frequency conversion and electro-optic modulation. Its reference properties include broad conversion bandwidths, low walk-off and high damage resistance.
Properties, applications and specifications
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, tunable laser radiation exhibiting energy conversion efficiencies above 50%. In addition, KTA has a very high damage threshold.
APPLICATION:
● Optical Parametric Oscillation (OPO)
● Frequency Doubling (SHG @1083nm-3789nm)
● Sum and Difference Frequency Generation (SFG)/(DFG)
● Electro-Optical Q-switch and modulation for Optical waveguides
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
● Lower absorption in the 3-4 µm spectrum range than KTP.
● Highly resistant to high intensity laser radiation.
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Dimension Tolerance
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W(+/-0.1)*H(+/-0.1)*L(+0.5/-0.1)mm
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Angle Tolerance
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+/-0.25°
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Perpendicularity
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≤10′
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Scratch/Dig
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20/10
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Chamfer
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≤0.2mmx45°
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Parallelism
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≤20″
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Chips
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≤0.1mm
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Flatness
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λ/10@633nm
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Clear Aperture
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≥90%
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Wavefront distortion
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λ/4@633nm
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Coatings
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C1---AR@1064(R<0.2%)&1533(R<0.5%)&3475(R<10%)
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Damage Threshold
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500MW/cm² (1064nm, 10ns, 10Hz)
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Physical Property:
| Crystal Structure | Orthorhombic, Point group mm2 |
| Lattice Parameters | a=13.125Å ,b=6.5716Å, c=10.786Å; Z=8 |
| Density | 3.454 g/cm3 |
| Mohs Hardness | ~ 5 |
| Melting Point | 1130°C |
| Curie Point | 880°C |
| Specific Heat | 0.687 cal/goC (25oC) |
| Dielectric Constant | eeff =42 |
| Absorption Coefficient | <0.05%/cm @1μm and 1.5μm |
| Electrical Conductivity | 0.7-3.4 x10-6s/cm (c-axis, 22oC, 2KHz) |
| Color | Colorless |
| Hygroscopic Susceptibility | No |
Optical Property:
| Transparency Range | 0.35μm ~ 5.3μm | ||
| Nonlinear Coefficients | d31=2.8 pm/V, d32=4.2 pm/V, d33=16.2 pm/V | ||
| (@1.064μm) | d24=3.2 pm/V, d15=2.3 pm/V | ||
| Electro-optical constants | r33 | r23 | r13 |
| (low frequency) | 37.5 pm/V | 15.4 pm/V | 11.5 pm |
| Sellmeier Equations | nx2 = 1.90713+1.23522l2/(λ2-0.19692)-0.01025λ2 | ||
| (λ in μm) | ny2 = 2.15912+1.00099l2/(λ2-0.21844)-0.01096λ2 | ||
| nz2 = 2.14768+1.29559l2/(λ2-0.22719)-0.01436λ2 | |||
| Refractive Indexes (@1.064μm) | nx | ny | nz |
| 1.783 | 1.7893 | 1.8679 | |
| SHG PM range | 1μm ~ 3μm | ||
| cut angle for NCPM OPO | θ | φ | |
| 90 | 0 | ||
| wavelength for NCPM OPO | Pump | Signal | Idler |
| 1064 nm | 1533 nm | 3475 nm | |
