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Updated: May 27, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Trajectory selection in high harmonic generation by controlling the phase between orthogonal two-color fields.

Leonardo Brugnera¹, David J Hoffmann, Thomas Siegel

¹Blackett Laboratory, Imperial College London, Prince Consort Road, London SW7 2BW, United Kingdom.

Physical Review Letters

|November 24, 2011

Summary

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Researchers achieved control over quantum trajectories in high harmonic generation using a two-color laser field. By adjusting the relative phase, they can manipulate electron trajectories, influencing short and long path contributions at the single-atom level.

Area of Science:

Quantum Optics
Attosecond Science
High Harmonic Generation

Background:

High harmonic generation (HHG) is a key process for producing extreme ultraviolet and X-ray light.
Understanding and controlling electron trajectories in HHG is crucial for advanced applications.
Short and long quantum trajectories contribute to the HHG spectrum, influencing its features.

Purpose of the Study:

To demonstrate control over short and long quantum trajectories in high harmonic emission.
To investigate the influence of a two-color, orthogonally polarized laser field on electron trajectories.
To achieve single-atom level control of quantum trajectory contributions.

Main Methods:

Utilizing classical and quantum calculations to model electron trajectories.

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Last Updated: May 27, 2026

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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The Generation of Higher-order Laguerre-Gauss Optical Beams for High-precision Interferometry

Published on: August 12, 2013

Employing an orthogonally polarized two-color femtosecond laser field (fundamental ω and second harmonic 2ω).

Experimentally varying the relative phase (ϕ) between the two laser fields by tilting a fused silica plate.

Main Results:

Demonstrated robust control over the relative contributions of short and long quantum trajectories.
Showed that manipulating the relative phase steers the two-dimensional electron trajectories.
Achieved control over whether trajectories return to the ionic core.

Conclusions:

The study presents the first demonstration of controlling short and long quantum trajectories at the single-atom level.
The developed method offers a pathway to precisely tailor high harmonic emission.
This control opens possibilities for advanced attosecond science and spectroscopy.