Potassium Titanyl Phosphate (KTP) Nonlinear Optical Crystal
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Potassium titanyl phosphate crystal (KTiOPO4, KTP) is a well-known nonlinear optical material for efficient frequency conversion of laser radiation in the near- and mid-infrared range. The popularity of KTP originates in its high laser-induced damage threshold of up to 30 GW/cm2 (single-shot measurement with 8.5 ns pulses at the wavelength of 1.064 µm), wide transparency range of 0.35−4.5 µm, sufficiently high nonlinear optical coefficients of d31 = 2.2 pm/V, d32 = 3.7 pm/V and d33 = 14.6 pm/V, and possibilities of manufacturing periodically poled structures in the crystal. Presently, KTP is considered a promising material for converting infrared (IR) laser radiation to terahertz waves.
| Transmitting Range: | 350nm ~ 4500nm | |||
| Phase Matching Range: | 984nm ~ 3400nm | |||
| Refractive Index: | @1064nm | 1.7377(nx) | 1.7453(ny) | 1.8297(nz) |
| @532nm | 1.7780(nx) | 1.7886(ny) | 1.8887(nz) | |
| Sellmeier Equations:(l in µm) | Nx2 = 3.0065 + 0.03901 / ( l2 - 0.04251) - 0.01327l2 | |||
| Ny2 = 3.0333 + 0.04154 / ( l2 - 0.04547) - 0.01408l2 | ||||
| Nz2 = 3.3134 + 0.05694 / ( l2 - 0.05658) - 0.01682l2 | ||||
| Therm-Optic Coefficient:(10-5/°C) | dnx/dT=1.1 | dny/dT=1.3 | dnz/dT=1.6 | |
| Absorption Coefficient: | a<1%/cm @1064nm and 532nm | |||
| Nonlinear Optical Coefficients and Equation: | @1064nm | d31=2.54pm/V | d32=4.35pm/V | d33=16.9pm/V |
| d24=3.64pm/V | d15=1.91pm/V | |||
| deff(II)=(d24-d15)sin2f sin2q - (d15sin2f +d24cos2q )sinq | ||||
| Electro-optic coefficients: | Low Frequency(pm/V) | High Frequency(pm/V) | ||
Reference
2. Flux Growth and External Morphology of KTiOPO4 Crystals, Cryst. Growth Des. 2009, 9, 2, 1190–1193