Potassium Titanyl Phosphate (KTiOPO3 or KTP) is widely used in both commercial and military lasers including laboratory and medical systems, range-finders, lidar, optical communication and industrial systems.
Table 1. Chemical and Structural properties
Crystal Structure | Orthorhombic, space group Pna21,point group mm2 |
Lattice Parameter | a=6.404?, b=10.616?, c=12.814?, Z=8 |
Melting Point | About 1172°C |
Mohs Hardness | 5 |
Density | 3.01 g/cm3 |
Thermal Conductivity | 13W/m/K |
Thermal Expansion Coefficient | αx=11x10-6/°C, αy=9x10-6/°C, αz=0.6x10-6/°C |
Table 2. Optical and Nonlinear Optical Properties
Transparency Range | 350～4500nm |
SHG Phase Matchable Range | 497～1800nm (Type II) |
Therm-optic Coefficients (/°C) | dnx /dT=1.1X10-5 |
Absorption Coefficients | <0.1%/cm at 1064nm <1%/cm at 532nm |
For Type II SHG of a Nd:YAG laser at 1064nm
| Temperature Acceptance: 24°C-cm |
NLO Coefficients | deff(II)≈(d24-d15)sin2φsin2θ-(d15sin2φ + d24cos2φ)sinθ |
Non-vanished NLO susceptibilities | d31=6.5 pm/V d24=7.6 pm/V |
Sellmeier Equations (λ in μm) | nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ 2 |
AR-coating
● Dual Band AR-coating (DBAR) of KTP for SHG of 1064nm.
low reflectance (R<0.2% at 1064nm and R<0.5% at 532nm );
high damage threshold (>300MW/cm2 at both wavelengths);
long durability.
● Broad Band AR-coating (BBAR) of KTP for OPO applications.
● High reflectivity coating: HR1064nm&HT532nm, R>99.8%@1064nm, T>90%@532nm.
● Other coatings are available upon request.
KTP Specifications:
● Dimension tolerance: (W±0.1mm)x(H±0.1mm)x(L+0.5/-0.1mm) (L≥2.5mm)
(W±0.1mm)x(H±0.1mm)x(L+0.1/-0.1mm) (L<2.5mm)
● Clear aperture: central 90% of the diameter
● No visible scattering paths or centers when inspected by a 50mW green laser
● Flatness: less than λ/8 @ 633nm
● Transmitting wavefront distortion: less than λ/8 @ 633nm
● Chamfer: ≤0.2mm@45°
● Chip: ≤0.1mm
● Scratch/Dig code: better than 10/ 5 to MIL-PRF-13830B
● Parallelism: better than 20 arc seconds
● Perpendicularity: ≤5 arc minutes
● Angle tolerance: Δθ≤0.25°, Δφ≤0.25°
● Damage threshold[GW/cm ]: >0.5 for 1064nm, TEM00, 10ns, 10HZ (AR-coated)
>0.3 for 532nm, TEM00, 10ns, 10HZ (AR-coated)
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