Chirp effects in femtosecond laser-induced surface second-harmonic generation from metals

Teng, H.; Guo, Chunlei
August 2004
Applied Physics Letters;8/16/2004, Vol. 85 Issue 7, p1110
Academic Journal
Chirp effects are studied in femtosecond laser-induced surface second-harmonic generation (SHG) from gold. We observe a higher SHG yield when the incident laser pulses are negatively chirped, compared to using the transform-limited or positively chirped pulses. This study indicates that SHG is critically dependent on the exciting wavelength sequence within the femtosecond pulse bandwidth when electrons contributing to SHG are heated to a sufficiently high temperature and are in thermal nonequilibrium distribution with the lattice.


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