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

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 electromagnetic wave is depoited on the surface. (C) 1996 American Institute of Physics.