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Elliptically polarized high-order harmonic generation by controlling quantum paths with two-dimensional laser fields.

Chunyang Zhai¹, Yifan Liu¹, Xiaosong Zhu²

¹College of Physics and Electronic Engineering, Xinyang Normal University, Xinyang 464000, China.

The Journal of Chemical Physics

|May 4, 2026

Summary

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This summary is machine-generated.

Researchers developed a flexible method to generate tunable elliptically polarized high-order harmonics using a two-dimensional two-color laser field. This technique enables precise control over ultrafast dynamics in chiral and magnetic materials.

Area of Science:

Attosecond science
Quantum optics
Materials science

Background:

Circularly and elliptically polarized high-order harmonics are crucial for studying ultrafast phenomena in chiral and magnetic materials.
Existing methods for generating elliptically polarized harmonics have significant limitations regarding laser requirements and target media.

Purpose of the Study:

To introduce a novel and flexible method for generating high-order harmonics with tunable ellipticity.
To overcome the stringent requirements of previous generation techniques.

Main Methods:

Utilizing a two-dimensional two-color laser field, composed of an elliptically polarized fundamental and a linearly polarized second-harmonic component.
Driving both atoms and randomly aligned molecules to control two-dimensional electron motion and intra-cycle harmonic interference.

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Main Results:

Successfully generated elliptically polarized high-order harmonics with tunable ellipticity.
Demonstrated that molecular structure influences harmonic polarization, allowing for consistent helicity control across broad spectra.
Enabled the synthesis of high-ellipticity attosecond pulses.

Conclusions:

The presented method offers a broadly applicable and flexible approach for generating elliptically polarized high-order harmonics.
This technique facilitates advanced probing of ultrafast dynamics in various materials.
It opens new avenues for attosecond pulse generation and manipulation.