Related Experiment Video
Updated: Jul 12, 2026

Measurements of Long-range Electronic Correlations During Femtosecond Diffraction Experiments Performed on Nanocrystals of Buckminsterfullerene
Published on: August 22, 2017
Interferences of ultrashort free electron wave packets
M Wollenhaupt1, A Assion, D Liese
1Universität Kassel, Fachbereich Physik, Heinrich-Plett-Strasse 40, D-34132 Kassel, Germany.
Scientists observed interferences in electron wave packets generated by femtosecond laser pulses interacting with atomic potassium. This demonstrates the transfer of light pulse coherence to electron wave packets for future quantum experiments.
Area of Science:
- Quantum optics
- Atomic physics
- Ultrafast spectroscopy
Background:
- Femtosecond laser pulses enable precise control over electron dynamics.
- Atomic ionization processes are fundamental to understanding light-matter interactions.
Purpose of the Study:
- To investigate the interference of free electron wave packets.
- To explore the transfer of temporal coherence from laser pulses to electrons.
- To study ionization dynamics in atomic potassium using controlled laser pulses.
Main Methods:
- Generation of free electron wave packets using time-delayed femtosecond laser pulses.
- Ionization of excited atomic potassium via one-photon and two-photon transitions.
- Utilizing parallel and crossed laser polarization schemes.
Main Results:
- Observed interference patterns in the generated free electron wave packets.
- Demonstrated the transfer of temporal coherence from the laser pulses to the electron wave packets.
- Distinguished between threshold and above-threshold ionization electron behaviors.
Conclusions:
- The temporal coherence of ultrashort light pulses can be imprinted onto free electron wave packets.
- This phenomenon opens new avenues for quantum control and manipulation of electrons.
- The findings pave the way for novel experiments in attosecond science and quantum information.
More Related Videos
11:33All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
Published on: January 19, 2018
09:49An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
Related Concept Videos
Interference and Diffraction
The de Broglie Wavelength
Interference and Superposition of Waves
Interference occurs in mechanical waves, such as sound waves, waves on a string, and surface water waves. Mechanical waves correspond to the physical displacement of particles. Hence,...
Propagation of Waves
Consider a scenario where a wave propagates from a string of low linear mass density to a string of high linear mass density. In such a case, the reflected wave is out of phase with respect to the incident wave, however the...
Sound Waves: Interference
Interference: Path Lengths
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...