KTP Nonlinear Crystal Potassium Titanyl Phosphate
KTP Nonlinear crystal Potassium Titanyl Phosphate 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.
Technical parameters of KTP
Tolerance of cutting angle | △θ≤±0.25°,△φ≤±0.25° |
Tolerance of dimension | Dimension+0/-0.1 mm，L：±0.1mm |
Flatness | λ/10 @ 632.8nm |
Wavefront distortion | λ/8@ 632.8nm |
Surface quality | 10/5 per MIL-O-13830A |
Parallelism | 20″ |
Perpendicularity | 5′ |
Clear Aperture: | > 90% |
Chamfer: | < 0.1 mm @ 45° |
Size | Upon customer request |
Coating | AR/HR coating upon customer’s request |
Damage Threshold | 750MW/CM2 at 1064nm, TEM00, 10ns, 10Hz |
Quality Warranty Period | One year under proper use |
Optical and Nonlinear properties of KTP
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 at 1064nm <1%/cm at 532nm |
Angle Acceptance | 14.2mrad·cm (φ);55.3mrad·cm (θ) for Type II SHG of a Nd:YAG laser at 1064nm |
Temperature Acceptance | 24°C·cm for Type II SHG of a Nd:YAG laser at 1064nm |
Spectral Acceptance | 0.56nm·cm for Type II SHG of a Nd:YAG laser at 1064nm |
Walk-off Angle | 0.55° for Type II SHG of a Nd:YAG laser at 1064nm |
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)-0.01327λ2 |
ny2=3.0333+0.04154/(λ2-0.04547)-0.01408λ2 | |
nz2=3.3134+0.05694/(λ2-0.05658)-0.01682λ2 | |
Electro-optic Coefficients: | Low and High frequency (pm/V) |
r13 | 9.5 and 8.8 |
r23 | 15.7and 13.8 |
r33 | 36.3 and 35 |
r51 | 7.3 and 6.9 |
r42 | 9.3 and 8.8 |
Relative Dielectric Constant | εeff=13 |
Physical properties of KTP crystal
Crystal Structure | Orthorhombic, space group Pna21,point group mm2 |
Lattice Parameter | a=6.404Å, b=10.616Å, c=12.814A, Z=8 |
Melting Point | About 1172°C |
Mohs Hardness | 5 |
Density | 3.01 g/cm3 |
Refractive indices | nX = 1,7404; nY = 1,7479; nZ = 1,8296 @1064 nm |
Thermal Conductivity | 13W/m/K |
Thermal Expansion Coefficients | ax=11x10-6/℃, ay=9x10-6/℃, az=0.6x10-6/℃ |
