KTP crystals is the most commonly used material for frequency doubling of Nd-doped lasers, particularly at the low or medium power density. It is widely used for frequency mixing to generate Red/Green/Blue output, and for OPO and OPA to generate visible to mid-infrared tunable output. It is also used for many E-O devices such as Q-switches and E-O modulators.
Advantages:
• Large nonlinear optical coefficient
• Wide angular bandwidth and small walk-off angle
• Broad temperature and spectral bandwidth
• High Electro-Optics(E-O) coefficient and low dielectric constant
• Non-hygroscopic, chemically and mechanically stable
KTP's Applications
• Frequency Doubling (SHG) of Nd-doped Lasers for Green/Red Output
• Frequency Mixing (SFM) of Nd Laser and Diode Laser for Blue Output
• Parametric Sources (OPG, OPA and OPO) for 600nm - 4500nm Tunable Ouptut
• E-O Modulators, Optical Switches, Directional Couplers
• Optical Waveguides for Integrated NLO and E-O Devices
Specification:
Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
Tolerance of dimension | Dimension+/-0.1 mm，L：±0.1mm |
Flatness | λ/8 @ 632.8nm |
Wavefront distortion | λ/8@ 632.8nm |
Surface quality | 20/10 |
Parallelism | 10″ |
Perpendicularity | 5′ |
Bevel/chamfer | <0.1mm@45deg. |
Chips | <0.1mm |
CA | >95% |
Coating | AR/HR coating Upon customer's request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
KTP (KTiOPO4) is widely used in commercial and military lasers, including laboratory and medical systems, range detectors, lidar, optical communications and industrial laser systems.
Chemical and structural properties
Crystal Structure | Orthrhombic crystal system, space group Pna21, point group mm2 |
Lattice Parameters | a=6.404?, b=10.616?, c=12.814?, Z=8 |
Melting Point | About 1172°C |
Moss Hardness | 5 |
Density | 3.01 g/cm3 |
Thermal Conductivity | 13W/m/K |
Thermal Expansion Coefficient | ax=11x10-6/0C, ay=9x10-6/0C, az=0.6x10-6/0C |
Optical and nonlinear optical properties
Transmissible Band Range | 350 ~ 4500nm |
SHG Phase Matching Range | 497 ~ 1800nm (Type II) |
Thermo-Optical Coefficient (/°C) | dnx/dT=1.1X10-5 |
Absorption Coefficient | <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 |
Nonlinear Coefficient | deff(II)? (d24 - d15)sin2fsin2q - (d15sin2f + d24cos2f)sinq |
Non-vanished | d31=6.5 pm/V d24=7.6 pm/V |
Sellmeier Equation (l in μm) | nx2=3.0065+0.03901/(l 2-0.04251)-0.01327l 2 |
Product Standards:
Dimensional tolerance: (width ±0.1mm) x (height ±0.1mm) x (length +0.5/-0.1mm) (length ≥ 2.5mm)
(Width±0.1mm)x(Height±0.1mm)x(Length+0.1/-0.1mm) (Length<2.5mm)
Clear aperture: center 90%
Under the 50mW green laser, there is no visible light path inside the crystal
Flatness: <λ/8 @ 633nm
Wavefront distortion: less than λ/8 @ 633nm
Edge chipping: ≤0.1mm
Surface quality: < 20/10
Parallelism of clear surface: <20"
Side verticality: ≤5'
Angle tolerance: △θ≤0.25°, △ф≤0.25°
Damage threshold: [GW/cm ]: >0.5 for 1064nm, TEM00, 10ns, 10HZ (AR-coated)
>0.3 for 532nm, TEM00, 10ns, 10HZ (AR-coated)
