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Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Full quantum trajectories resolved high-order harmonic generation.

Peng Ye1, Xinkui He1, Hao Teng1

  • 1Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China.

Physical Review Letters
|August 30, 2014
PubMed
Summary
This summary is machine-generated.

Researchers used a phase-stabilized laser to generate high-order harmonics, revealing a unique spectrum that maps quantum trajectories. This provides a direct visualization of electron behavior in high-order harmonic generation.

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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 extreme ultraviolet and X-ray light.
  • Understanding the quantum mechanics underlying HHG is crucial for controlling light generation.

Purpose of the Study:

  • To investigate the influence of laser phase on the two-dimensional spectrum of high-order harmonics.
  • To develop a method for resolving and visualizing quantum trajectories in HHG.

Main Methods:

  • Utilizing a carrier-envelope-phase stabilized sub-2-cycle laser pulse.
  • Analyzing the two-dimensional spectrum of generated high-order harmonics, resolving temporal and spatial frequencies.
  • Employing an analytical model and quantum mechanics simulations for validation.

Main Results:

  • An arrowlike spectrum was experimentally observed, enabling the resolution of full quantum trajectories.
  • Harmonics from different quantum trajectories were spatially separated in the spectrum.
  • The laser phase and classical-like action were shown to maximally differentiate wavefront curvatures for short and long trajectories.

Conclusions:

  • The study provides a direct, full map of quantum trajectories in high-order harmonic generation.
  • The observed spectral features offer unprecedented insight into the quantum dynamics of HHG.
  • This work advances the control and understanding of attosecond light sources.