Crystals Materials
KTA Crystal
for Optical Parametric Oscillation (OPO) applications
Potassium Titanyle Arsenate (KTiOAsO4), or KTA crystal, is an excellent nonlinear optical crystal for Optical Parametric Oscillation (OPO) application. It has better non-linear optical and electro-optical coefficients, significantly reduced absorption in the 2.0-5.0 μm region, broad angular and temperature bandwidth, low dielectric constants. And its low ionic conductivities result in higher damage threshold compared with KTP. KTA is often used as an OPO / OPA gain medium for emission in the 3μm range as well as an OPO crystal for eye-safe emission at high average power.
| Thickness/Diameter Tolerance | ±0.05 mm |
| Orientation Tolerence | < 0.5° |
| Size | 3 mm ~ 150 mm or Upon customer request |
| Dimension Tolerances | ±0.05 mm |
| Surface Quality | 10/5 S/D per MIL-O-13830A |
| Parallelism | < 10 arcsec |
| Perpendicularity | < 5 arcmin |
| Clear Aperture | > 90% |
| Wavefront Distortion | λ/8 @ 633 nm |
| Surface Flatness | < λ/8 @ 632.8 nm |
| Chamfer | < 0.1 mm @ 45° |
| Coating | AR/HR/PR coating upon customer's request |
| Chemical Formula | KTiOPO4 |
|---|---|
| Crystal Structure | Orthorhombic, space group Pna21, point group mm2 |
| Lattice Constant | a=13.125Å, b=6.5716Å, c=10.786Å |
| Density | 3.45 g/cm3 |
| Melting Point | About 1130°C |
| Thermal Conductivity (W/m/k@25°C) | k1=1.8, k2=1.9, k3=2.1 W/m*K |
| Hardness (Mohs) | 5 |
| Transparency Range | 350 nm - 5300 nm |
| Absorption Coefficients | < 0.05%/cm(@1064 nm), < 0.05%/cm(@1533 nm), < 5%/cm(@3475 nm) |
| NLO Coefficients | d31 = 2.76, d32 = 4.74, d33 = 18.5 , d15 = 2.3, d24 = 3.2 |
| Electro-optic coefficients | ｒ33=37.5; ｒ23=15.4; ｒ13=11.5 |
| SHG Phase Matchable Range | 1083 nm - 3789 nm |
Stock specification list
If need other specifications and quantities products, please contact us(sales@aogcrystal.com).
AR/HR/PR coatings are available at your specified wavelength.
Be sure to wear laser safety goggles when checking optical path and adjusting optical axis.
KTA is relatively soft and therefore requires precautions to protect its polished surfaces.
When angle adjusting is necessary, keep in mind that the acceptance angle of KTA is small.
| Part Number | Size | Theta, θ | Phi, φ | Coating S1/S2 | Application |
|---|---|---|---|---|---|
| KTA-Cry-001 | 5x5x20 mm | 45 | 0 | AR@1064+(1500-4500) nm | OPO@1064 nm |
| KTA-Cry-002 | 6x6x3 mm | 46 | 0 | AR@1030+(1700-5000) nm | OPO@1030 nm |