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Related Experiment Video

Updated: Jun 1, 2026

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

20 mJ, 1 ps Yb:YAG Thin-disk Regenerative Amplifier

Published on: July 12, 2017

Gas jet structure influence on high harmonic generation.

James Grant-Jacob¹, Benjamin Mills, Thomas J Butcher

¹Optoelectronics Research Centre, University of Southampton, Southampton, SO17 1BJ, UK. jgj@orc.soton.ac.uk

|June 7, 2011

Summary

This summary is machine-generated.

Optimizing high harmonic generation (HHG) requires understanding gas jet profiles. Focusing lasers into the Mach disc maximizes extreme-UV light flux due to increased density.

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Area of Science:

Atomic, Molecular, and Optical Physics
Plasma Physics
Laser Science

Background:

High harmonic generation (HHG) is a crucial process for producing extreme-UV (XUV) light.
Gas jets are commonly used as targets for HHG, but their complex density and velocity profiles affect performance.

Purpose of the Study:

To investigate the influence of a gas jet's three-dimensional profile on extreme-UV light generation.
To identify optimal focusing conditions for maximizing HHG flux from gas jet sources.

Main Methods:

Systematic variation of the laser focus position along the gas jet flow axis.
Measurement of the output extreme-UV radiation intensity.
Simultaneous imaging of atom and ion fluorescence to probe jet density.

Main Results:

The output radiation intensity varied significantly (approximately three-fold) with laser focus position.
Maximum flux was achieved when the laser focus was positioned at the Mach disc of the gas jet.
Increased jet density within the Mach disc structure was confirmed as the cause of flux enhancement.

Conclusions:

The three-dimensional density and velocity profile of gas jets critically impacts HHG efficiency.
Focusing into the Mach disc is an effective strategy for optimizing HHG flux.
This research provides guidance for improving HHG sources based on gas jets.