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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Updated: Jun 14, 2025

Generation and Coherent Control of Pulsed Quantum Frequency Combs
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Generation of Quantum Vortex Electrons with Intense Laser Pulses.

Zhigang Bu1, Liangliang Ji1, Xuesong Geng1

  • 1State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics (SIOM), Chinese Academy of Sciences (CAS), Shanghai, 201800, China.

Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|September 3, 2024
PubMed
Summary

High-energy electrons scattered by intense lasers gain orbital angular momentum (OAM), transforming into quantum vortex states. This breakthrough offers a new method for generating specialized leptons for particle and nuclear physics research.

Keywords:
intense laser pulseorbital angular momentumquantum electrodynamicsquantum vortex stateradiation reaction

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Area of Science:

  • * Particle and Nuclear Physics
  • * Quantum Electrodynamics
  • * Laser-Plasma Physics

Background:

  • * High-energy electrons are fundamental to particle and nuclear physics research.
  • * Manipulating electron wave functions can unlock new physical phenomena.
  • * Intense laser pulses offer a tool for controlling energetic particles.

Purpose of the Study:

  • * To investigate the interaction between high-energy electrons and intense, circularly polarized laser pulses.
  • * To explore the efficient transfer of angular momentum from photons to electrons.
  • * To demonstrate the generation of electrons with quantum vortex states.

Main Methods:

  • * Theoretical modeling using nonlinear quantum electrodynamics (QED).
  • * Simulation of electron scattering with femtosecond intense laser pulses.
  • * Analysis of electron wave function transformation and emitted photon spectra.

Main Results:

  • * A regime was identified for efficient transfer of photon spin angular momentum to electron orbital angular momentum (OAM).
  • * GeV-level electrons acquired significant intrinsic OAM (> ħ) at laser intensities of 10^20 W cm^-2.
  • * Scattered electrons exhibited a twisted wave function, forming a quantum vortex state.
  • * Emitted gamma-photons displayed a distinct two-peak spectrum.

Conclusions:

  • * Femtosecond intense lasers can effectively twist electron wave functions into quantum vortex states.
  • * This method provides a novel way to generate relativistic leptons with OAM using existing laser technology.
  • * The findings pave the way for new sources in particle and nuclear physics.
  • * The unique spectral signature of emitted photons distinguishes these vortex electrons.