Power law decay of harmonic spectra in ultrarelativistic laser-plasma interactions

Boyd, T. J. M.; Ondarza-Rovira, R.
August 2010
Physics of Plasmas;Aug2010, Vol. 17 Issue 8, p080701
Academic Journal
Particle-in-cell simulations have been used to explore the transition from the m-8/3 decay in the power emitted by high harmonics to a regime for which the harmonic power Pm∼m-p, where m denotes the harmonic number and p=5/3 or, less commonly, p=4/3. The deviation from the p=8/3 spectrum is interpreted as a consequence of the degree to which emission at the plasma frequency and its harmonics contribute to the spectrum. The research reported here explores conditions under which these deviations arise.


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