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KTP crystal also has high electro-optic(E-O) coefficient and low dielectric constant, and large figure of merit, these features make it also widely used in electro-optic application.
KTP crystal is mostly used as nonlinear crystals for frequency doubling of solid-state Nd:YAG crystal or Nd:YVO4 crystal laser, as it has large nonlinear optical coefficients, wide angular bandwidth and small walk-off angle, broad temperature and spectral bandwidth. KTP crystal also has high electro-optic(E-O) coefficient and low dielectric constant, and large figure of merit, these features make it also widely used in electro-optic application.
Advantages of KTP Crystal
Large Nonlinear Optical (NLO) Coefficients
Wide Angular Bandwidth and Small Walk-off Angle
Broad Temperature and Spectral Bandwidth
High Electro-Optic (E-O) Coefficient and Low Dielectric Constant
Large Figure of Merit for an Optical Waveguide Modulator
Nonhygroscopic, Good Chemical and Mechanical Properties
PRODUCT PARAMETERS
Specifications of KTP Crystal: | |
Angle tolerance: | Δθ< ± 0.5°; Δφ< ±0.5° |
Dimensional Tolerance: | (W ± 0.1mm) x (H ± 0.1mm) x (L + 0.2mm/-0.1mm) |
Flatness: | <λ/8 at 633nm |
Surface Quality: | 10/5 Scracth/Dig |
Parallelism: | < 20 arc seconds |
Perpendicularity: | < 5 arc minutes |
Wavefront Distortion: | <λ/8 at 632.8nm |
Clear Aperture: | Central 95% |
Chamfer: | 0.15x45° |
Coating: | a) * S1,S2: AR @ 1064 nm R<0.1% & 532nm R<0.25% |
b) * S1:HR @ 1064nm R>99.8% & HT@ 808nm T>95% | |
S2:AR @ 1064 nm R<0.1% & 532nm R<0.25% | |
Properties of KTP Crystal: | |
Crystal structure | Orthorhombic, point group mm2 |
Melting point | 1172°C incongruent |
Cell parameters | a=6.404Ä, b=10.616Ä, c=12.814Ä, Z=8 |
Curie point | 936°C |
Mohs hardness | ~5 |
Density | 3.01 g/cm3 |
Color | colorless |
Hygroscopic susceptibility | no |
Specific heat | 0.1643 cal/g.°C |
Thermal conductivity | 0.13 W/cm/°K |
Electrical conductivity | 3.5x10-8 s/cm (c-axis, 22°C, 1KHz) |
Transmitting range | 350nm~4500nm | |||
Refractive indices | - | nx | ny | nz |
1064nm | 1.7377 | 1.7453 | 1.8297 | |
532nm | 1.778 | 1.7886 | 1.8887 | |
Absorption coefficients | a < 1%/cm @1.064µ m and 0.532µ m | |||
Phase matchable range | 0.984 - 3.4 µ m | |||
Therm-optic coefficients | dnx/dT=1.1x10-5/°C, dny/dT=1.3x10-5/oC, dnz/dT=1.6x10-5/°C | |||
Nonlinear optical coefficients | d31=2.54pm/V, d32=4.35pm/V, d33=16.9pm/V | |||
d24=3.64pm/V, d15=1.91pm/V at 1.064 mm | ||||
deff(II)≈ (d24 - d15)sin2φsin2θ - (d15sin2φ + d24cos2φ)sinθ | ||||
Electro-optic coefficients | - | Low frequency(pm/V) | High requency(pm/V) | |
γ13 | 9.5 | 8.8 | ||
γ23 | 15.7 | 13.8 | ||
γ33 | 36.3 | 35 | ||
γ51 | 7.3 | 6.9 | ||
γ42 | 9.3 | 8.8 | ||
Dielectric constant | eeff=13 | |||
Sellmeier equations of KTP Crystal 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 | ||||
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