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Updated: May 11, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent high-order harmonic generation by sawtooth-like laser fields.

Yang Xiang1, Shufen Liu

  • 1School of Computer Science and Technology, Jilin Uuniversity, Changchun 130012, China. xiangyang@hpu.edu.cn

Optics Express
|May 15, 2013
PubMed
Summary

Controlling high-order harmonic generation with sawtooth laser fields allows for coherent attosecond pulse generation. Adjusting the laser

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Area of Science:

  • Quantum optics
  • Attosecond science
  • Nonlinear optics

Background:

  • High-order harmonic generation (HHG) is a key process for producing ultrashort light pulses.
  • Controlling the spectral properties of HHG is crucial for applications like attosecond pulse generation.
  • Sawtooth laser fields offer a novel waveform for driving HHG.

Purpose of the Study:

  • To theoretically investigate high-order harmonic generation (HHG) driven by sawtooth-like laser fields.
  • To explore the control of harmonic spectrum coherence using the sawtooth shape parameter.
  • To demonstrate the potential for generating phase-stabilized attosecond pulse trains.

Main Methods:

  • Theoretical investigation of HHG.
  • Numerical simulations of electron dynamics in sawtooth laser fields.
  • Analysis of harmonic spectrum coherence and intensity.

Main Results:

  • The coherence of the high-order harmonic spectrum can be controlled by adjusting the sawtooth shape parameter α.
  • Proper selection of α weakens harmonics from long electron trajectories.
  • Harmonic photons in the plateau exhibit high coherence over a broad frequency range.

Conclusions:

  • Sawtooth laser fields provide a method to control HHG spectral coherence.
  • This control enables the selection of coherent harmonics for attosecond pulse generation.
  • A phase-stabilized attosecond pulse train with a regular structure can be obtained.

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