Generation of the second harmonic of femtosecond pulses on reflection from a metal surface: amplification due to periodic modulation of the relief

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Abstract
It is observed experimentally that the optical second-harmonic generation signal produced when femtosecond laser pulses are reflected from a metal surface increases more than 100-fold when a specially chosen periodic relief that gives quasiresonance excitation of a surface electro-magnetic wave is depoited on the surface.