Laser induced strong-field ionization gas jet tomography.

Area of Science:

• Laser-driven science
• Plasma physics
• Advanced imaging techniques

Background:

• Characterizing gas jet spatial density is crucial for laser-plasma and high harmonic generation experiments.
• Conventional tomography methods face limitations in resolution and scan depth due to laser beam divergence.

Purpose of the Study:

• To introduce and validate a novel in-situ strong field ionization tomography (SFI-T) approach.
• To enhance the spatial resolution and depth of focus for gas jet characterization.

Main Methods:

• Utilizing strong field ionization as the imaging mechanism for tomography.
• Comparing SFI-T performance against linear/single-photon imaging modalities.
• Analyzing resolution improvements and depth of focus characteristics.

Main Results:

• SFI-T achieves a resolution improvement of approximately a factor of 2, resolving ~8 times smaller voxel volumes.
• The method localizes the depth of focus due to strong-field interaction physics, overcoming limitations of laser beam divergence.
• Demonstrated superior performance compared to single- and multi-photon imaging.

Conclusions:

• The proposed SFI-T method provides a significant advancement for gas jet characterization.
• This technique is particularly beneficial for strong field and attosecond science experiments requiring high-resolution diagnostics.