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Updated: Jun 14, 2026

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Measurement of Ultrafast Vibrational Coherences in Polyatomic Radical Cations with Strong-Field Adiabatic Ionization

Published on: August 6, 2018

1.2 mJ sub-4-fs source at 1 kHz from an ionizing gas.

S Adachi¹, N Ishii, Y Nomura

¹Institute for Solid State Physics, University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8581, Japan. adachi@issp.u-tokyo.ac.jp

|April 6, 2010

Summary

Researchers developed a novel laser source producing 1.2 millijoule (mJ), 3.8 femtosecond (fs) pulses. This breakthrough enables sub-2-cycle, multi-millijoule laser systems for advanced applications.

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Area of Science:

Laser physics
Ultrafast optics
Nonlinear optics

Background:

Generating ultrashort laser pulses (<10 fs) with high energy (mJ) is crucial for many scientific fields.
Existing methods for spectral broadening often face limitations in energy scalability or pulse duration control.

Purpose of the Study:

To demonstrate a novel method for energy-scalable spectral broadening in an ionizing gas medium.
To achieve carrier-envelope phase-controlled laser pulses with durations below 4 fs and millijoule energies.

Main Methods:

Utilizing a novel energy-scalable spectral broadening technique in an ionizing gas.
Implementing carrier-envelope phase control for precise pulse manipulation.

Main Results:

Demonstrated a laser source producing 1.2 mJ, 3.8 fs pulses.
Achieved carrier-envelope phase control on the generated ultrashort pulses.
The method is widely applicable to multimillijoule laser systems.

Conclusions:

The developed technique provides a viable path towards sub-2-cycle, multi-millijoule laser pulses.
This advancement is expected to significantly impact fields requiring high-intensity, ultrashort laser interactions.