KTP
Melting point: 1172°C; density: 2.945 g/cm3; transmission: 350nm~4500nm; damage threshold: 1.5-2.0MW/cm2; flatness: λ/8 @633nm; surface quality: 10-5; parallelism: ≤10"; perpendicularity: ≤5′. KTP (KTiOPO4), potassium titanyl phosphate, is an excellent electro-optic and acousto-optic nonlinear crystal. High nonlinear coefficients, broad transmission, large acceptance angles, and thermal stability suit nonlinear and waveguide applications. KTP is widely used for infrared SHG, with conversion efficiency at 1064nm up to 80%. It combines high nonlinear and electro-optic coefficients, low dielectric constant, high thermal conductivity, no deliquescence, stable mechanics, easy polishing, and no decomposition below 900 degrees. Basic properties Crystal Structure | Orthorhombic,Space groupPna21,Point groupmm2 Lattice Parameters | a=6.404A, b=10.616A, c=12.814A, Z=8 Melting Point | About 1172°C Mohs Hardness | 5 Density | 3.01 g/cm3 Thermal Conductivity | 13W/m/K Thermal Expansion Coefficients | ax=11x10-6/0C, ay=9x10-6/0C, az=0.6x10-6/0C Transmission Range | 350~4500nm SHG Phase-Matching Range | 497 ~ 1800nm (Type II) Thermo-Optic Coefficients(/°C) | dnx/dT=1.1X10-5 dny/dT=1.3X10-5 dnz/dT=1.6X10-5 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 Spectral Acceptance: 0.56nm-cm Angular Acceptance: 14.2mrad-cm (φ);55.3mrad-cm (q) Walk-off Angle: 0.55 Nonlinear Coefficients | deff(II)≈(d24 - d15)sin2fsin2q - (d15sin2f + d24cos2f)sinq Non-vanished Nonlinear Magnetization Coefficients | d31=6.5 pm/V d24=7.6 pm/V d32= 5 pm/V d15=6.1 pm/V d33=13.7 pm/V Sellmeier Equations (λ in μm) | nx2=3.0065+0.03901/(l 2-0.04251)-0.01327l 2 ny2=3.0333+0.04154/(l 2-0.04547)-0.01408l 2 nz2=3.3134+0.05694/(l 2-0.05658)-0.01682l Main Applications | Advantages | Application Areas Laser Frequency Doubling（SHG） Fundamental range: 1.0-1.3μm | Large non-linear coefficient | Low-power CW lasers | (∼3pm/V at 1064/532nm) | Medical and aesthetic lasers | Small walk-off | Ti:sapphire laser pumping OPO X-cut Signal wavelength: 1.57μm | Monolithic design available: OPO mirrors on the crystals’faces | Eye-safe devices (target designation, laser ranging) OPO range: 1.53 -3.0 μm | High efficiency | ZGP OPO pumping | Walk-off compensating design available at 2.1 μm |
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