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Tunable few-cycle laser pulses in the visible spectrum are efficiently generated by four wave mixing process during the filamentation in air. The mode quality and energy stability were exceptional.
The second- and third-harmonics enhancement in birefringent silicon-based photonic crystals and microcavities at the photonic band gap edge due to fulfilment of phase matching condition is controlled due to anisotropy of porous silicon dielectric function.
Langmuir-Blodgett films of varying thickness are investigated by second-harmonic generation. The common assumption of unity refractive index is shown to be incorrect even for a monolayer, which appears to be well described by bulk constants.
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