KTP Crystal
Potassium Titanyl Phosphate (KTiOPO4 or KTP) KTP is the most commonly used material for frequency doubling of Nd:YAG and other Nd-doped lasers, particularly when the power density is at a low or medium level. To date, extra and intra-cavity frequency doubled Nd:lasers using KTP have become a preferred pumping source for visible dye lasers and tunable Ti:Sapphire lasers as well as their amplifiers. They are also useful green sources for many research and industry applications. KTP is also being used for intracavity mixing of 0.81µm diode and 1.064µm Nd:YAG laser to generate blue light and intracavity SHG of Nd:YAG or Nd:YAP lasers at 1.3µm to produce red light. In addition to unique NLO features, KTP also has promising E-O and dielectric properties that are comparable to LiNbO3. These advantaged properties make KTP extremely useful to various E-O devices. KTP is expected to replace LiNbO3 crystal in the considerable volume application of E-O modulators, when other merits of KTP are combined into account, such as high damage threshold, wide optical bandwidth (>15GHZ), thermal and mechanical stability, and low loss, etc.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Crystal structure | Orthorhombic |
| Melting point | 1172°C |
| Curie Point | 936°C |
| Lattice parameters | a=6.404Å, b=10.615Å, c=12.814Å, Z=8 |
| Temperature of decomposition | ~1150°C |
| Transition temperature | 936°C |
| Mohs hardness | »5 |
| Density | 2.945 g/cm³ |
| Color | colorless |
| Hygroscopic Susceptibility | No |
| Specific heat | 0.1737 cal/g.°C |
| Thermal conductivity | 0.13 W/cm/°C |
| Electrical conductivity [c-axis；22°C；1KHz] | 3.5×10⁻⁸ s/cm (c-axis, 22°C, 1KHz) |
| Thermal expansion coefficients | a₁ = 11 x 10⁻⁶ °C⁻¹ a₂ = 9 x 10⁻⁶ °C⁻¹ a₃= 0.6 x 10⁻⁶ °C⁻¹ |
| Thermal conductivity coefficients | k₁ = 2.0 x 10⁻² W/cm °C k₂ = 3.0 x 10⁻² W/cm °C k₃ = 3.3 x 10⁻² W/cm °C |
| Transmitting range | 350nm ~ 4500nm |
| Phase Matching Range | 984nm ~ 3400nm |
| Absorption coefficients [1064nm and 532nm] | a < 1%/cm @1064nm and 532nm |
| Phase matching range | 497nm – 3300 nm |
| Nonlinear coefficients [@10-64nm；at 1.064 mm] | d₃₁=2.54pm/V, d₃₁=4.35pm/V, d₃₁=16.9pm/V d₂₄=3.64pm/V, d₁₅=1.91pm/V at 1.064 mm |
| Effective nonlinear optical coefficients | dₑff(II)≈ (d₂₄ – d₁₅)sin²qsin²j – (d₁₅sin²j + d₂₄cos²j)sinq |
| Phase matching angle [Type II SHG of 1064nm Laser] | q=90°, f=23.2° |
| Effective nonlinear optical coefficients [Type II SHG of 1064nm Laser] | dₑff » 8.3 x d₃₆(KDP) |
| Angular acceptance [Type II SHG of 1064nm Laser] | D_θ= 75 mrad D_φ= 18 mrad |
| Temperature acceptance [Type II SHG of 1064nm Laser] | 25°C.cm |
| Spectral acceptance [Type II SHG of 1064nm Laser] | 5.6 Åcm |
| Walk-off angle [Type II SHG of 1064nm Laser] | 1 mrad |
| Optical damage threshold [Type II SHG of 1064nm Laser] | 1.5-2.0MW/cm² |
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