首页|Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse
Tunable spectral continuous shift of high-order harmonic generation in atoms by a plasmon-assisted shaping pulse
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We delve into the phenomenon of high-order harmonic generation within a helium atom under the influence of a plasmon-assisted shaping pulse.Our findings reveal an intriguing manipulation of the frequency peak position in the harmonic emission by adjusting the absolute phase parameter within the frequency domain of the shaping pulse.This phe-nomenon holds potential significance for experimental setups necessitating precisely tuned single harmonics.Notably,we observe a modulated shift in the created harmonic photon energy,spanning an impressive range of 1.2 eV.This frequency peak shift is rooted in the asymmetry exhibited by the rising and falling edges of the laser pulse,directly influencing the position of the peak frequency emission.Our study quantifies the dependence of this tuning range and the asymmetry of the laser pulse,offering valuable insights into the underlying mechanisms driving this phenomenon.Furthermore,our investigation uncovers the emergence of semi-integer order harmonics as the phase parameter is altered.We attribute this discovery to the intricate interference between harmonics generated by the primary and secondary return cores.This obser-vation introduces an innovative approach for generating semi-integer order harmonics,thus expanding our understanding of high-order harmonic generation.Ultimately,our work contributes to the broader comprehension of complex phenomena in laser-matter interactions and provides a foundation for harnessing these effects in various applications,particularly those involving precise spectral control and the generation of unique harmonic patterns.
high-order harmonicsemi-integer-orderspectra shiftinhomogeneous field
王源、李玉龙、乔月、高娜、郭福明、陈洲、赫兰海、杨玉军、赵曦、王俊
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Institute of Atomic and Molecular Physics,Jilin University,Changchun 130012,China
Jilin Provincial Key Laboratory of Applied Atomic and Molecular Spectroscopy,Jilin University,Changchun 130012,China
Beijing Institute of Space Launch Technology,Beijing 100076,China
School of Physics and Information Technology,Shaanxi Normal University,Xi'an 710062,China
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