Fused Silica Optics Co.,LTD
Fused Silica Optics Co.,Ltd
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KTP Crystal for Laser Treatment
Potassium Titanyl Phosphate (KTiOPO4 or KTP) is widely used in both commercial and military lasers including laboratory and medical systems, range-finders, lidar, optical communication and industrial systems.
Specification
| Dimension tolerance | (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
| Angle tolerance | θ < ± 0.5°; Δφ < ± 0.5° |
| Scratch/Dig code | 20/10 (MIL-O-13830A) |
| Flatness | λ/8 @ 633nm |
| Parallelism | < 20 arc seconds |
| Perpendicularity | < 5 arc minutes |
| Clear aperture | > 90% central area |
| Wavefront distortion | < λ/8 @ 632.8nm |
| Coating | S1:R<0.2%@1064nm + R<0.5%@532nm |
| S2: R>99.8%1064nm + T>95%@532nm | |
| Chamfer | 0.15±0.05mm x45° |
| SHG phase matching | 497 ~ 1800nm (Type II) |
KTP (KTiOPO4) is a nonlinear optical crystal, which possesses excellent nonlinear and electro-optic properties.It has large nonlinear optical coefficients and wide angular bandwidth and small walk-off angle,etc.which make it suitable for various nonlinear frequency conversion and wave guide application. Due to very high effective nonlinearity (d eff ~8.3xd 36 (KDP)at 1.06 µm) and excellent optical properties,KTP perfectly suits as lasing material in various applications .The phase matching range of KTP crystal lies in 0.99-3.3 µm region .This allows us to use KTP as an intracavity and extracavity frequency double for the most commonly used lasers,such as Nd:YAG,Nd:Glass and Nd:YLF.
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 |
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 dny/dT=1.3X10-5 dnz/dT=1.6X10-5 |
| Absorption Coefficients | <0.1%/cm at 1064nm <1%/cm at 532nm |
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For Type II SHG of a Nd:YAG laser at 1064nm
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Temperature Acceptance: 24°C-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=5 pm/V d15=6.1 pm/V d33=13.7 pm/V |
| Sellmeier Equations (λ in μm) |
nx2=3.0065+0.03901/(λ2-0.04251)-0.01327λ 2 ny2=3.0333+0.04154/(λ 2-0.04547)-0.01408λ2 nz2=3.3134+0.05694/(λ 2-0.05658)-0.01682λ2 |