Description | ◇Potassium Titanyle Arsenate(KTiOAsO4), or KTA crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) Applications. 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. |
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Applications | ◆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 | |||
Features | ◇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 | |||
◇Non-hygroscopic crystal | |||
Main Specification | Material | KTiOAsO4 | |
Orientation accuracy of cut angle | <30 arc min | ||
Non-critical Phase matching angle θ and φ | q 90° j 0° |
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Coating | AR Coating Available | ||
Dimension tolerance | +0/-0,1 mm Length +0/-0,1 | ||
Flatness | l/10 @633nm | ||
Surface quality | 10/5 | ||
Parallelism | <30 arc sec | ||
Perpendicularity | < 30 arc min | ||
Transmitting Wavefront distortion | < l/8@633nm | ||
Clear aperture | > 90% central area | ||
Physical Properties | Crystal Structure | Orthorhombic, Point group mm2 | |
Cell Parameters | a=13.125Å b=6.5716Å c=10.786 Å | ||
Melting Point | 1130℃ | ||
Hardness | ~5 | ||
Density | 3.454 g/cm3 | ||
Absorption Coefficient | @ 1064 nm <0.05 %/cm @ 1533 nm <0.05 %/cm @ 3475 nm <5%/cm |
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Hygroscopic Susceptibility | None | ||
Thermal Conductivity | (mW/cm/°C) |
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Linear Optical Properties | Transparency Range | 350-5300nm | |
Average refractive index | 1.8 | ||
Sellmeier Equations | Ni2=Ai+Biλ2/(λ2-Ci2)-Diλ2(λ in um) |
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Nonlinear Optical Properties | SHG Phase-matchable range | 1083-3789nm | |
Wavelength | Pump 1064 nm Signal 1533 nm Idler 3475 nm |
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Non-vanished NLO susceptibilities | d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d15 = 3.2 | ||
Electro-optical constants (low frequency) |
r33=37.5 pm/V r23=15.4 pm/V r13=11.5 pm/V |
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Optical damage threshold | >1,5GW/cm2 for 10ns pulses @ 1064 nm |