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Related Experiment Video

Updated: Jul 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Generation and Coherent Control of Pulsed Quantum Frequency Combs

Published on: June 8, 2018

Coherent Subcycle Optical Shock from a Superluminal Plasma Wake.

H Peng¹, T W Huang¹, K Jiang¹

¹Shenzhen Key Laboratory of Ultraintense Laser and Advanced Material Technology, Center for Advanced Material Diagnostic Technology, and College of Engineering Physics, Shenzhen Technology University, Shenzhen 518118, China.

Physical Review Letters

|October 20, 2023

Summary

Researchers generated ultrashort, high-intensity coherent Cherenkov radiation using a relativistic electron beam in a plasma wake. This novel method offers tunable frequencies and excellent directionality for advanced applications.

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Last Updated: Jul 12, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Published on: July 2, 2012

Area of Science:

Plasma physics
Accelerator physics
Laser science

Background:

Relativistic electron beams (REB) interacting with plasma generate wakes.
Cherenkov radiation is emitted when charged particles exceed the phase velocity of light in a medium.

Purpose of the Study:

To investigate the generation of coherent Cherenkov radiation from a superluminal plasma wake.
To develop a theoretical model for this radiation phenomenon.

Main Methods:

Three-dimensional particle-in-cell simulations.
Far-field time-domain radiation simulations.
Development of a theoretical model based on a superluminal current dipole.

Main Results:

Coherent, isolated subcycle pulses emitted at the Cherenkov angle.
Radiation generated by bubble-sheath electrons at the rear of the plasma wake.
Radiation exhibits attosecond duration, high intensity, and low angular divergence.

Conclusions:

The proposed method effectively generates tunable, high-quality coherent Cherenkov radiation.
The theoretical model accurately describes the observed radiation.
This technique opens possibilities for novel radiation sources across various spectra.