KTP
Potassium Titanyl Phosphate-KTP
Potassium Titanyl Phosphate (KTiOPO4 or KTP) was firstly reported in 1971. With the progress and improvement of KTP crystal growth technology, it is currently widely used in laser systems for industrial, military, laboratory, lidar and optical communication application.
KTP Features:
1.Large nonlinear optical coefficient
2.Large receiving angle and small departure angle
3.Wide temperature and spectral bandwidth
4.High photoelectric coefficient and low dielectric constant
5.High quality factor
6.Non deliquescent, stable in chemical and mechanical properties
Specification
| Dimension Tolerance | (W±0.1mm)x(H±0.1mm)x(L±0.2mm/0.1mm) |
| Clear Aperture | ≥ 90% |
| Surface Quality (Scratch/Dig) | 20/10 |
| Angle Tolerance | ≤0.250 |
| Parallelism | <30″ |
| Perpendicularity | ≤10′ |
| Flatness | <λ/8@633nm |
| Transmitted Wavefront Distortion | <λ/8@633nm |
| Anti-Reflection Coating | Customized |
Chemical and Structural Properties
| Crystal Structure | Orthorhombic, Space group Pna21, Point group mm2 |
| Lattice Parameter | a = 6.404 Å, b = 10.616 Å, c = 12.814 Å, Z = 8 |
| Melting Point | About 1172℃ |
| Mohs Hardness | 5Mohs |
| Density | 3.01g/cm3 |
| Thermal Conductivity | 13W/mK-1 |
| Thermal Expansion Coefficients | ax=11×10-6/℃, ay=9×10-6/℃, az=0.6×10-6/℃ |
Optical and Nonlinear Optical Properties
| Transparency Range | 350~4500nm |
| SHG Phase Matchable Range | 497 ~ 1800nm (Type II) |
| Therm-optic Coefficient ( λ in μm) | dnx/dT=1.1X10-5/℃ |
| dny/dT=1.3X10-5/℃ | |
| dnz/dT=1.6X10-5/℃ | |
| Absorption Coefficients | <0.1%/cm @ 1064nm <1%/cm @ 532nm |
| For Type II SHG of a Nd:YAG laser at 1064nm | Temperature Acceptance: 24℃·cm |
| Spectral Acceptance: 0.56nm·cm | |
| Angular Acceptance: 14.2mrad·cm (φ); 55.3mrad·cm(θ) | |
| Walk-off Angle: 0.55° | |
| NLO Coefficients | deff(II)≈(d24– d15)sin2φsin2θ- (d15sin2φ+ d24cos2φ)sinθ |
| Non-vanished NLO Susceptibilities | d31=6.5 pm/V d24=7.6 pm/V |
| d32= 5pm/V d15=6.1 pm/V | |
| d33=13.7 pm/V | |
| Sellmeier Equations (λ in μm)[1] | nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ2 |
| ny2=3.0333+0.04154/( λ2-0.04547)-0.01408λ2 | |
| nz2=3.3134+0.05694/( λ2-0.05658)-0.01682λ2 | |
| Dielectric Constant | ɛeff = 13 |
*[1] Reference to IEEE, J. Quantum Electronics, Vol.QE-27, No.5, 1137(1991)
