Ultra-high order harmonic generation via a free electron laser mechanism

  • In this paper, by using the ``frequency up-conversion'' principle with a high gain harmonic generation free electron laser and an external seed laser, we consider the possibility of modulating a relativistic electron beam on the attosecond scale, so that it can produce
    coherent spontaneous radiation from the deep ultraviolet to the hard X-ray spectral region with a very short radiator. Analytical estimation and three-dimensional numerical modeling show the great potential to reach ultra-high harmonics up to several thousand. For an electron bunch with the typical quality as in the free electron laser scheme and a seed laser with 800 nm wavelength, 0.8 nm attosecond trains with alterable duration and GW scale peak power are modeled. The output radiation exhibits good shot-to-shot stability, full coherence and perfect tuning ability between the discrete harmonics of the seed frequency.

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DENG Hai-Xiao and DAI Zhi-Min. Ultra-high order harmonic generation via a free electron laser mechanism[J]. Chinese Physics C, 2010, 34(8): 1140-1147. doi: 10.1088/1674-1137/34/8/020
DENG Hai-Xiao and DAI Zhi-Min. Ultra-high order harmonic generation via a free electron laser mechanism[J]. Chinese Physics C, 2010, 34(8): 1140-1147.  doi: 10.1088/1674-1137/34/8/020 shu
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Received: 2009-08-21
Revised: 2010-01-15
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Ultra-high order harmonic generation via a free electron laser mechanism

    Corresponding author: DENG Hai-Xiao,

Abstract: 

In this paper, by using the ``frequency up-conversion'' principle with a high gain harmonic generation free electron laser and an external seed laser, we consider the possibility of modulating a relativistic electron beam on the attosecond scale, so that it can produce
coherent spontaneous radiation from the deep ultraviolet to the hard X-ray spectral region with a very short radiator. Analytical estimation and three-dimensional numerical modeling show the great potential to reach ultra-high harmonics up to several thousand. For an electron bunch with the typical quality as in the free electron laser scheme and a seed laser with 800 nm wavelength, 0.8 nm attosecond trains with alterable duration and GW scale peak power are modeled. The output radiation exhibits good shot-to-shot stability, full coherence and perfect tuning ability between the discrete harmonics of the seed frequency.

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