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Time Multiplexing Super Resolving Technique for Imaging from a Moving Platform

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A new imaging-based method for alignment of multiple laser beams.

Yair Yifrach¹, Rami Rahimi¹, Alexander Portnov¹

¹Department of Physics, Ben-Gurion University of the Negev, Beer-Sheva 8410501, Israel.

Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy

|May 4, 2020

Summary

A novel method combining spatial map imaging (SMI) and velocity map imaging (VMI) precisely aligns multiple laser beams for spectroscopy. This technique enhances spatial overlap evaluation, improving spectroscopic study outcomes.

Keywords:

Ionization-loss stimulated Raman spectroscopy Spatial map imaging Velocity map imaging

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Area of Science:

Atomic, Molecular, and Optical Physics
Chemical Physics
Spectroscopy

Background:

Precise alignment of multiple laser beams is critical for advanced spectroscopic techniques.
Evaluating the spatial overlap between laser and molecular beams is often challenging.
Existing methods may lack the resolution or versatility for complex multi-laser experiments.

Purpose of the Study:

To introduce and demonstrate a new method for aligning multiple laser beams.
To enhance the visualization and spatial overlap assessment of laser beams with molecular beams.
To improve the efficiency and outcomes of spectroscopic studies involving multiple lasers.

Main Methods:

Coupling spatial map imaging (SMI) with velocity map imaging (VMI).
Interrogating ionization signals of different species using a time-of-flight mass spectrometer.
Monitoring resonant two-photon ionization and ionization-loss stimulated Raman spectra.

Main Results:

The SMI-VMI method effectively visualizes laser beam alignment and spatial overlap.
Resonant two-photon ionization spectra of 2-phenylethylamine (PEA) monomer and its hydrated cluster were obtained.
Ionization-loss stimulated Raman spectra of the PEA cluster were successfully measured.
Distinction between molecular ion and cluster features in spectra was achieved.

Conclusions:

The proposed SMI-VMI methodology offers a robust solution for multiple laser beam alignment.
This technique is highly effective for evaluating laser-molecular beam spatial overlap.
The method is expected to significantly benefit various challenging multiple laser spectroscopic experiments.