KTP Crystal
EBETTER’S KTP crystals feature high purity, low absorption at fundamental and second harmonic generation wavelengths. We supply superior grade and customer-designed KTP crystals for various applications.
Advantages
• Large nonlinear optical (NLO) coefficients
• Wide angular bandwidth and small walk-off angle
• Broad temperature and spectral bandwidths
• High electro-optic (E-O) coefficient and low dielectric constant
• Large figure of merit for an optical waveguide modulator
• Non-hygroscopic, good chemical and mechanical properties
Chemical and Structural Properties
| Crystal Structure |
Orthorhombic, space group Pna21,point group mm2
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Lattice Parameter
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a=6.404Å, b=10.616Å, c=12.814Å, Z=8
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Melting Point
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About 1172℃
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Mohs Hardness
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5 |
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Density
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3.01 g/cm3
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Thermal Conductivity Coefficient
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13W/m/K
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Thermal Expansion Coefficient
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ax=11x10-6/℃ , ay=9x10-6/℃ , az=0.6x10-6/℃
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Optical and Nonlinear Optical Properties
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Transparency Range
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350~4500nm
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SHG Phase Matchable Range
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497 ~ 1800nm (Type II)
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Thermal-optic Coefficients (/℃ )
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dnx/dT=1.1X10-5 dny/dT=1.3X10-5
dnz/dT=1.6X10-5
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Absorption Coefficients
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<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℃ •cm
Spectral Acceptance: 0.56nm•cm
Angular Acceptance: 14.2mrad•cm (φ);55.3mrad•cm (θ)
Walk-off Angle: 0.55°
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NLO Coefficients
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deff(II) ≈ (d24 - d15)sin2φsin2θ - (d15sin2 φ+ d24cos2φ)sinθ
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Non-vanished NLO Susceptibilities
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d31=6.5 pm/V d24=7.6 pm/V d32= 5 pm/V d15=6.1 pm/V
d33=13.7 pm/V
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Electro-optic Coefficients:
r13
r23
r33
r51
r42
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Low frequecy(pm/V) High frequency(pm/V)
9.5 8.8
15.7 13.8
36.3 35.0
7.3 6.9
9.3 8.8
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Dielectric Constant
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εeff=13
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Sellmeier Equations (λ in μm)
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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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