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Related Concept Videos

Interference: Path Lengths01:10

Interference: Path Lengths

Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation
10:52

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Published on: February 4, 2017

Multi-quantum-path interference in high harmonic generation driven by a chirped laser pulse.

Candong Liu1, Yinghui Zheng, Zhinan Zeng

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, China.

Optics Express
|June 10, 2009
PubMed
Summary

We observed multi-quantum-path interference (MQPI) in high harmonic generation, identifying four key quantum paths. This effect, influenced by laser pulse chirp, extends beyond single atoms and is experimentally observable.

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Last Updated: Jun 22, 2026

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Area of Science:

  • Quantum optics
  • Atomic physics
  • Nonlinear optics

Background:

  • High harmonic generation (HHG) is a fundamental process in nonlinear optics.
  • Understanding quantum path interference is crucial for controlling HHG.

Purpose of the Study:

  • To theoretically investigate quantum-path interference in high harmonic generation in argon.
  • To identify the contributing quantum paths and the effect of laser chirp.

Main Methods:

  • Theoretical investigation of HHG in argon.
  • Analysis of multi-quantum-path interference (MQPI).
  • Consideration of three-dimensional propagation and spatial filtering for angle-selective detection.

Main Results:

  • Observed the multi-quantum-path interference (MQPI) effect related to laser pulse chirp.
  • Identified four significantly contributing quantum paths in isolated atom interaction.
  • Demonstrated MQPI beyond single-atom response using spatial filtering.

Conclusions:

  • The MQPI effect in HHG is significant and influenced by laser chirp.
  • Four dominant quantum paths contribute to the observed interference.
  • Experimental observation of high-order electron returning trajectories in HHG is feasible.