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ZnOis one of the most promising materials for optoelectronic devices for UV spectral range because of its wide and direct bandgap (3.37 eV) and high exciton binding energy (60 meV). The generation of multiphoton absorption (MPA) induced luminescence in ZnO by highly intense fs-lasers in near infrared offers one effective route for optical excitation. Therefore, much attention has been paid recently...
Angularly and spectrally resolved second harmonic studies for c-axis ZnO nanorods are reported. 7.5 times higher efficiency than for BBO was found at 55 GW/cm2 at Ti:sapphire laser oscillator wavelengths. Spectral profiles agree with simulations.
Sub-wavelength periodic surface structures in titanium dioxide with periods of 170 and 90 nm were generated with 150 fs pulses at 800 and 400 nm, respectively. Formation mechanisms and conditions for large-area patterning are discussed.
It is well known that periodical poling of ferroelectrics crystals cannot modulate the intrinsic third order nonlinearity. We report that it can however modulate the effective nonlinearity due to cascaded quadratic processes in PPLN crystal.
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