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Second harmonic generation in plasmas produced by intense femtosecond laser pulses

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4 Author(s)
von der Linde, D. ; Inst. fuer Laser und Plasmaphys., Univ.-GHS-Essen, Germany ; Schulz, H. ; Engers, T. ; Schuler, H.

Plasmas were produced by tightly focusing femtosecond laser pulses onto the surface of metal films and glass targets. A relatively intense, well-collimated second harmonic could be observed in the specular direction. The conversion efficiency reached 10-4 for focused intensities around 1016 W/cm2. Detailed measurements of the angular dependence, the polarization properties, and the second-harmonic frequency spectra were performed. Time-resolved pump-probe experiments revealed interesting information about the dynamics of the plasmas. It is suggested that resonant absorption plays an important role in second-harmonic generation

Published in:

Quantum Electronics, IEEE Journal of  (Volume:28 ,  Issue: 10 )