Potassium Titanyl Arsenate (KTiOAsO₄), commonly referred to as KTA Crystal, is a high-performance nonlinear optical material primarily used in Optical Parametric Oscillation (OPO) applications. KTA exhibits superior optical and electro-optical properties, including significantly reduced absorption in the mid-infrared (2.0-5.0 µm) region, broader temperature acceptance, and a lower dielectric constant compared to its counterpart KTP (Potassium Titanyl Phosphate). Its high damage threshold, minimal ionic conductivity, and stable chemical properties make it ideal for demanding applications in laser systems, medical devices, and advanced photonics.
KTA’s transparency range extends from 350 nm to 5300 nm, making it versatile for both visible and infrared applications. The crystal’s low thermal conductivity is compensated by its high optical quality, making it a preferred choice for frequency mixing, parametric generation, and Q-switching.
KTA Crystals are widely employed in photonic systems due to their exceptional nonlinear optical properties. Some key applications include:
| Property | Details |
|---|---|
| Crystal Structure | Orthorhombic, Point group mm2 |
| Lattice Parameters | a = 13.125 Å, b = 6.5716 Å, c = 10.786 Å |
| Melting Point | 1130°C |
| Mohs Hardness | ~5 |
| Density | 3.454 g/cm³ |
| Thermal Conductivity | K1: 1.8 W/m·K, K2: 1.9 W/m·K, K3: 2.1 W/m·K |
| Property | Details |
|---|---|
| Transparency Range | 350-5300 nm |
| Absorption Coefficients | <0.05%/cm @ 1064 nm, 1533 nm |
| NLO Susceptibilities | d₃₁ = 2.76 pm/V, d₃₂ = 4.74 pm/V, d₃₃ = 18.5 pm/V |
| Electro-Optical Constants | r₁₃ = 37.5 pm/V, r₃₃ = 15.4 pm/V |
| SHG Phase Matchable Range | 1083-3789 nm |
| Sellmeier Equations (λ in µm) | n² = A + Bλ²/(λ² – C²) – Dλ² |
| Constants for Sellmeier Equations: | A = 1.90713, B = 1.23522, C = 0.19692, D = 0.01025 |
| Specification | Details |
|---|---|
| Dimension Tolerance | W × H (± 0.1 mm) × L (+0.5/-0.1 mm) |
| Angle Tolerance | Δθ < 0.25°, Δφ < 0.25° |
| Parallelism | < 20 arc seconds |
| Surface Flatness | λ/8 @ 633 nm |
| Scratch/Dig | 10/5 |
| Wavefront Distortion | λ/8 @ 633 nm |
| Chamfer | 0.1 mm @ 45° |
| Damage Threshold | >0.5 GW/cm² (AR-coated @ 1064 nm) |
Spectrum transmission data confirms KTA’s high transparency from 350 nm to 5300 nm, ensuring low absorption losses and broad applicability in optical systems.
| Face Dimensions (mm) | Length (mm) | Coating | Application | Price (USD) |
|---|---|---|---|---|
| 3 × 3 | 5 | AR@1064 nm | SHG Type II | $350 |
| 5 × 5 | 10 | AR@532 nm | OPO | $480 |
| 7 × 7 | 15 | Broadband AR | SFG/DFG | $650 |
| Custom | Custom | Upon Request | Tailored for Applications | Quote Available |
