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Related Experiment Video

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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Published on: February 4, 2017

Two-center interference during the high harmonic generation in aligned O2 molecules.

Pengfei Wei¹, Yongli Yu, Xiaodong Guo

¹College of Physics & Electronic Information Engineering, Wenzhou University, Wenzhou, China.

|January 26, 2011

Summary

We studied two-center interference in high-order harmonic generation (HHG) from O2 and CO2 molecules. We found that laser intensity can shift the constructive enhancement spectral region in O2 molecules.

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Area of Science:

Atomic, Molecular, and Optical Physics
Quantum Optics
Laser Physics

Background:

High-order harmonic generation (HHG) is a crucial nonlinear process for producing coherent extreme ultraviolet and X-ray radiation.
Molecular HHG exhibits complex interference patterns influenced by molecular structure and laser parameters.
Understanding two-center interference is key to controlling HHG spectra for applications.

Purpose of the Study:

To experimentally investigate the angular distribution and laser intensity dependence of two-center interference in O2 molecules.
To compare the HHG dynamics of O2 with CO2 molecules.
To explore the tunability of constructive enhancement in O2 HHG by varying laser intensity.

Main Methods:

Experimental measurement of high-order harmonic generation (HHG) from O2 and CO2 molecules.
Analysis of the temporal evolution and angular distribution of HHG signals.
Application of a modified interference model to explain observed phenomena.

Main Results:

Observed characteristic enhancement and suppression in HHG from O2 molecules, consistent with the modified interference model.
Demonstrated that the spectral region of constructive enhancement in aligned O2 molecules is tunable.
Showed that tuning the driving laser intensity shifts the constructive enhancement spectral region.

Conclusions:

The modified interference model accurately explains the observed two-center interference in O2 and CO2 HHG.
Laser intensity provides a controllable parameter to tune the spectral features of molecular HHG.
This work offers insights into controlling molecular HHG for potential applications in attosecond science and spectroscopy.