KTP Electro-optic crystal
KTP, or potassium titanyl phosphate, offers excellent nonlinear and electro-optic properties. Its high electro-optic coefficient and low dielectric constant support high-frequency operation and electro-optic Q-switching. It also offers strong frequency-doubling performance, with a large nonlinear coefficient, no walk-off, a high optical-damage threshold and little temperature dependence of phase matching. It is used for 1064-532nm frequency doubling in medium- and low-power Nd:YAG and Nd:YVO₄ lasers. High nonlinearity, mechanical stability, optical quality and transparency from 350 nm–4500nm support its broad use as a nonlinear medium. It is particularly useful for intracavity and extracavity frequency doubling of medium- and low-power neodymium lasers. Applications also include SHG for green/red output from Nd-doped lasers and sum-frequency mixing (SFM) for blue output from Nd lasers and diode lasers.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Material | KTiOPO₄ |
| Cut-angle orientation accuracy | <30 arcmin |
| Phase matching | Type Ⅱ, θ=90°; φ=phase-matching angle |
| Phase-matching range | 497-3300nm |
| Angle Tolerance | Δθ≤0.25°，ΔΦ≤0.25° |
| Dimensional tolerance | (width ±0.1mm) × (height ±0.1mm) × (length +0.5/-0.1mm), length ≥2.5mm |
| Dimensional tolerance | (width ±0.1mm) × (height ±0.1mm) × (length +0.1/-0.1mm), length <2.5mm |
| Flatness [@633nm] | ＜λ/8 @633nm |
| Surface Quality | 10/5 S/D |
| Parallelism | <10 arcsec |
| Perpendicularity | ≤5 arcmin |
| Coating [@1064nm R<0.1%] | a) S1&S2:AR@1064nm R<0.1% |
| Coating [@532nm, R<0.25%] | AR@532nm, R<0.25% |
| Coating [@1064nm，R>99.8%] | b) S1:HR@1064nm，R>99.8% |
| Coating [@808nm，T>5%] | High temperature @808nm，T>5% |
| Coating [@1064nm， R<0.1%] | S2: HR@1064nm， R<0.1% |
| Coating | Coatings can be customized to user requirements |
| Crystal Structure | Orthorhombic point group: mm² |
| Lattice parameters | a=6.404Å,b=10.615Å,c=12.814Å,z=8 |
| Melting point | ～1172℃ |
| Transition temperature | 936℃ |
| Decomposition temperature | ～1150℃ |
| Optical homogeneity | dn～10⁻⁶/cm |
| Hardness | ～5 |
| Density | 3.01g/cm³ |
| Specific heat | 0.1737cal/g.℃ |
| Absorption coefficient [@1064nm and 532nm] | a<1%/cm@1064nm and 532nm |
| Hygroscopicity | No |
| Dielectric constant | 13 |
| Coefficient of thermal expansion [In the range 25℃-900℃] | a1=11×10⁻⁶ ℃⁻¹ |
| Coefficient of thermal expansion [In the range 25℃-900℃] | a2=9×10⁻⁶℃⁻¹ |
| Coefficient of thermal expansion [In the range 25℃-900℃] | a3=0.6×10⁻⁶ ℃⁻¹ |
| Thermal conductivity | k1=2.0×10⁻² W/cm ℃ |
| Thermal conductivity | k2=3.0×10 ⁻²W/cm ℃ |
| Thermal conductivity | k3=3.3×10⁻² W/cm ℃ |
| Electrical conductivity | 3.5×10⁻⁸ s/cm (c axis, 22℃, 1kHz) |
| Transparency range | 497-1800nm |
| Thermo-optic coefficient dnₓ/dT | dnₓ/dT=1.1×10⁻⁵/℃ |
| Thermo-optic coefficient dn_y/dT | dn_y/dT=1.3×10⁻⁵/℃ |
| Thermo-optic coefficient dn_z/dT | dn_z/dT=1.6×10⁻⁵/℃ |
| Sellmeier equation | nₓ²=3.0065+0.03901/(I2-0.04251)-0.01327I2 |
| Sellmeier equation | n_y²=3.0333+0.04154/(I2-0.04527)-0.01408I2 |
| Sellmeier equation | n_z²=3.3134+0.05694/(I2-0.05658)-0.01682I2 |
| Effective nonlinear optical coefficient | deff(Ⅱ)≈(d₂₄-d₁₅)sin2θsin2φ-(d₁₅sin2φ+d₂₄cos2φ)sinθ |
| Damage Threshold [@1064nm] | >0.5GW/cm³ for 10ns pulses @1064nm |
Key Features
Datasheet
Supplier Information
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