Potassium Titanyl Phosphate (KTP Crystal ) is a versatile nonlinear optical crystal widely utilized in commercial and scientific applications due to its superior optical properties. With a high nonlinear optical coefficient, KTP is a preferred choice for frequency doubling of Nd:YAG lasers and other laser systems operating at low to medium power. Its broad angular bandwidth and minimal walk-off angle make it ideal for producing high-quality beam output. The non-hygroscopic nature of KTP ensures long-term durability, even in challenging environments. Additionally, KTP crystals exhibit excellent electro-optic coefficients, making them highly suitable for electro-optic modulators, waveguides, and optical communication systems.
KTP crystals are renowned for their extensive applications in photonics and laser technology:
| Property | Value |
|---|---|
| Crystal Structure | Orthorhombic, Space group Pna2₁, Point group mm² |
| Lattice Parameters | a = 6.404 Å, b = 10.616 Å, c = 12.814 Å |
| Melting Point | ~1172 °C |
| Mohs Hardness | 5 |
| Density | 3.01 g/cm³ |
| Thermal Conductivity | 13 W/m·K |
| Thermal Expansion Coefficient | aₐ = 11×10⁻⁶ /°C, aᵦ = 9×10⁻⁶ /°C, aₐ = 0.6×10⁻⁶ /°C |
| Property | Value |
|---|---|
| Transparency Range | 350–4500 nm |
| SHG Phase Matchable Range | 497–1800 nm (Type II) |
| Thermal-Optic Coefficients (°C⁻¹) | dn/dT = 1.1 × 10⁻⁵, dn/dT = 1.3 × 10⁻⁵ |
| Absorption Coefficients (cm⁻¹) | <0.1% @ 1064 nm, <1% @ 532 nm |
| NLO Coefficients | d₃₃ = 13.7 pm/V, d₃₁ = 6.5 pm/V |
| Walk-off Angle | 0.55° @ 1064 nm |
| Sellmeier Equations (λ in μm) | nₓ² = 3.0065 + 0.03901 / (λ² – 0.04251) – 0.01327λ² |
| Dielectric Constant | εᵣ = 13 |
| Specification | Value |
|---|---|
| Dimension Tolerance (mm) | W × H (± 0.1) × L (± 0.5/± 0.1) |
| Angle Tolerance | Δθ ≤ 0.25°, Δφ ≤ 0.25° |
| Parallelism | <20 arc seconds |
| Perpendicularity | <5 arc minutes |
| Chamfer | 0.1 mm @ 45° |
| Surface Quality | 10/5 Scratch/Dig |
| Surface Flatness | λ/8 @ 633 nm |
| Damage Threshold (GW/cm²) | >1.0 @ 1064 nm, >0.3 @ 532 nm |
Spectrum transmission curves are available upon request, showcasing the high transparency of KTP within the 350 nm to 4500 nm range.
KTP crystals can be provided with high-quality coatings to enhance their optical performance:
| Face Dimensions | Length | Theta | Phi | Coatings | Application | Price (USD) |
|---|---|---|---|---|---|---|
| 3×3 mm | 5 mm | 90° | 23° | AR@532+1064nm | SHG@1064nm Type I | $110 |
| 5×5 mm | 10 mm | 90° | 23° | AR@532+1064nm | SHG@1064nm Type I | $150 |
| 7×7 mm | 20 mm | 90° | 23° | AR@532+1064nm | SHG@1064nm Type I | $200 |
| Custom | Custom | Custom | Custom | Custom | Custom | Inquire |
