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Related Experiment Video

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An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers

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Published on: October 23, 2018

Ultrafast Time-Resolved Photoelectric Emission.

Thomas Juffmann¹, Brannon B Klopfer¹, Gunnar E Skulason¹

¹Physics Department, Stanford University, Stanford, California 94305, USA.

Physical Review Letters

|January 15, 2016

Summary

Ultrafast laser excitation of tungsten tips reveals electron emission delays up to 10 femtoseconds. This study demonstrates a novel technique for precisely measuring electron timing with femtosecond resolution.

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Area of Science:

Physics
Quantum Mechanics
Materials Science

Background:

Characterizing electron emission dynamics is crucial for understanding light-matter interactions.
Ultrafast laser excitation enables probing electron behavior on femtosecond timescales.

Purpose of the Study:

To directly measure the emission times of laser-triggered electrons from a tungsten tip.
To develop a high-resolution technique for characterizing ultrafast electron dynamics.

Main Methods:

Utilized ultrafast, near-infrared laser excitation of a sharp tungsten tip.
Employed a synchronously driven microwave cavity to measure photoelectron energy gain.
Achieved femtosecond timing resolution for electron emission delays.

Main Results:

Observed electron emission delays up to 10 femtoseconds (fs).
Demonstrated a timing resolution capable of measuring shifts up to 55 picoseconds (ps).
Achieved microwave phase measurement precision below 70 fs.

Conclusions:

Direct characterization of laser-triggered electron emission times is feasible.
The developed technique offers unprecedented timing resolution for electron dynamics.
This method has potential applications in precise microwave phase measurements.