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Related Experiment Video

Updated: Jul 4, 2026

Quasi-light Storage for Optical Data Packets

Quasi-light Storage for Optical Data Packets

Published on: February 6, 2014

Carrier-envelope phase measurement from half-cycle high harmonics.

Pengfei Lan¹, Peixiang Lu, Fang Li

¹Wuhan National Laboratory for Optoelectronics, Huazhong University of Science and Technology, Wuhan 430074, PR China.

|June 11, 2008

Summary

Researchers developed a new method to observe high harmonics from laser pulses. This technique allows for in situ measurement of laser properties like intensity and carrier-envelope phase.

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Area of Science:

Quantum Optics
Attosecond Science
Nonlinear Optics

Background:

High harmonic generation (HHG) is a crucial process for producing extreme ultraviolet (XUV) and soft X-ray radiation.
Observing HHG on a sub-laser-cycle timescale is challenging but essential for understanding ultrafast dynamics.
Current methods often lack the resolution to distinguish dynamics within individual half-cycles of the driving laser pulse.

Purpose of the Study:

To develop an efficient method for observing high harmonics generated within individual half-cycles of a driving laser pulse.
To demonstrate the capability of in situ retrieval of laser pulse parameters from harmonic spectrograms.
To explore the potential of this method for extending carrier-envelope phase (CEP) measurements to longer laser pulses.

Main Methods:

Mixing a weak ultraviolet (UV) pulse with the high harmonic signal.
Imaging the cutoff of each half-cycle harmonic.
Performing numerical simulations to analyze the retrieved information from harmonic spectrograms.

Main Results:

The developed method allows for the observation of high harmonics from individual half-cycles of the driving laser pulse.
Simulations confirm that laser intensity, pulse duration, and carrier-envelope phase (CEP) can be retrieved in situ from the harmonic spectrogram.
The method successfully distinguishes half-cycle high harmonics for laser pulses longer than 10 femtoseconds (fs).

Conclusions:

This technique provides an efficient way to probe ultrafast dynamics within laser-driven high harmonic generation.
The ability to retrieve laser pulse parameters in situ offers a powerful diagnostic tool for ultrafast science.
The findings suggest a potential extension of CEP measurement capabilities to the multi-cycle laser pulse regime.