HGTR-KTP Nonlinear crystal
HGTR-KTP (high gray-track-resistant KTP) addresses gray tracking, which appears directly as black or gray damage marks inside the crystal. HGTR-KTP nonlinear crystals substantially reduce Ti⁺³ ion-center defects within the crystal during laser frequency doubling. They offer a large nonlinear optical coefficient, high thermal conductivity, small mismatch and walk-off angle, resistance to deliquescence, and stable chemical and mechanical properties. They are widely used as frequency-doubling crystals for conversion from 1064-532 nm in low- and medium-power Nd:YAG and Nd:YVO₄ lasers. They can also be used to make frequency-doubling, frequency-mixing, electro-optic modulation, optical parametric oscillation, and optical waveguide devices.
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Overview
Specifications
| Parameter | Value |
|---|---|
| Chemical formula | HGTR-KTiOPO₄ |
| Crystal Structure | Orthorhombic crystal system, space group Pna21, point group mm2 |
| Lattice parameters | a=6.404Å |
| Lattice parameters | b=10.616Å |
| Lattice parameters | c=12.814Å |
| Lattice parameters | Z=8 |
| Mohs hardness | 5 |
| Density | 3.01 g/cm³ |
| Melting point | 1172°C |
| Thermal conductivity | 13 W/m/K |
| Coefficient of thermal expansion | aₓ=11x10⁻⁶/℃ |
| Coefficient of thermal expansion | a_y=9x10⁻⁶/℃ |
| Coefficient of thermal expansion | a_z=0.6x10⁻⁶/℃ |
| SHG phase-matching range | 497-1800nm (Type II) |
| Nonlinear coefficient [@1064nm] | deff(II)≈(d₂₄-d₁₅)sin2φsin2θ-(d₁₅sin2φ+d₂₄cos2φ)sinθ |
| Nonlinear coefficient d₃₁ [@1064nm] | d₃₁=2.54pm/V |
| Nonlinear coefficient d₃₂ [@1064nm] | d₃₂=1.35pm/V |
| Nonlinear coefficient d₃₃ [@1064nm] | d₃₃=16.9pm/V |
| Nonlinear coefficient d₂₄ [@1064nm] | d₂₄=3.64pm/V |
| Nonlinear coefficient d₁₅ [@1064nm] | d₁₅=1.91pm/V |
| Thermo-optic coefficient dnₓ/dT | dnₓ/dT=1.1*10⁻⁵/℃ |
| Thermo-optic coefficient dn_y/dT | dn_y/dT=1.3*10⁻⁵/℃ |
| Thermo-optic coefficient dn_z/dT | dn_z/dT=1.6*10⁻⁵/℃ |
| Damage Threshold [@1064 nm,TEM₀₀, 10ns,10HZ(AR-coated)] | >0.5 @1064 nm,TEM₀₀, 10ns,10HZ(AR-coated) |
| Damage Threshold [@532 nm,TEM₀₀, 10ns,10HZ(AR-coated)] | >0.3 @532 nm,TEM₀₀, 10ns,10HZ(AR-coated) |
| Transparency range | 350-4500 nm |
| Absorption coefficient [@1064 nm] | <0.1%/cm @1064 nm |
| Absorption coefficient [@532 nm] | <1%/cm @532 nm |
| Refractive Index [@1064nm] | nₓ=1.7377, n_y=1.7453, n_z=1.8297 @1064nm |
| Refractive Index [@532nm] | nₓ=1.7780, n_y=1.7886, n_z=1.8887 @532nm |
| Sellmeier equation (λ in μm) | nₓ²=3.0065+0.03901/(λ²-0.04251)-0.01327λ² n_y²=3.0333+0.04154/(λ²-0.04547)-0.01408λ² n_z²=3.3134+0.05694/(λ²-0.05658)-0.01682λ² |
Key Features
Datasheet
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