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Updated: Jan 17, 2026
09:49
An Experimental Protocol for Femtosecond NIR/UV - XUV Pump-Probe Experiments with Free-Electron Lasers
Published on: October 23, 2018
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Spectral broadening and pulse shaping in the deep ultraviolet
Optics Letters
|January 15, 2026
Summary
Researchers generated and shaped ultrashort deep ultraviolet (DUV) pulses, enabling stable, programmable pulse pairs for advanced spectroscopy. This breakthrough advances time-resolved experiments with attosecond precision.
Area of Science:
- Ultrafast optics
- Quantum optics
- Spectroscopy
Background:
- Generating ultrashort pulses in the deep ultraviolet (DUV) is crucial for probing ultrafast phenomena.
- Previous DUV pulse generation methods often lack phase stability and programmability.
- Precise control over pulse characteristics is essential for advanced time-resolved experiments.
Purpose of the Study:
- To develop a method for generating and shaping ~20 femtosecond pulses in the DUV.
- To enable programmable generation of phase-locked pulse-pairs with high stability.
- To demonstrate the utility of these pulses in time-resolved spectroscopy.
Main Methods:
- Spectral broadening of femtosecond pulses in a stretched hollow-core fiber.
- Compression and shaping using an acousto-optic modulator (AOM)-based pulse shaper.
- Pulse characterization using self-diffraction frequency-resolved optical gating (FROG) and dispersion scan (DISP) in the DUV.
Main Results:
- Successful generation and shaping of ~20 fs DUV pulses.
- Demonstration of programmable, phase-locked pulse-pair generation with attosecond-level stability.
- Validation of pulse performance in a pump-probe experiment resolving electronic dynamics on attosecond timescales.
Conclusions:
- The developed technique provides a stable and programmable source for ultrashort DUV pulses.
- This method facilitates in-air delivery of pulses for 2D spectroscopy and other time-resolved studies.
- The ability to generate phase-locked pulse pairs opens new avenues for exploring attosecond dynamics.
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