Extreme ultraviolet tomography of multi-jet gas puff target for high-order harmonic generation

Abstract

A volume, tomographic reconstruction of a novel, multi-jet gas puff target, developed for possible applications in high-order harmonic generation (HHG), is presented. The target, produced by pulsed injection of argon gas through nozzle in a form of linearly oriented small orifices, has been characterized in the extreme ultraviolet at 13.5 nm wavelength. Target density estimations were performed, and 3-D representation of pulsed gaseous target has been obtained by combining 2-D shadowgram images, recorded at various rotation angles. More detailed information about higher-order jets, formed as a result of collisions of primary jets, was obtained. Tomographic studies of such type of targets dedicated for HHG have been obtained to our knowledge for the first time.

Characterization of pulsed capillary channel gas puff target using EUV shadowgraphy

“…The most commonly used is laser interferometry [29], however, recently reported tomography of those targets is capable of visualizing them in 3-D showing in detail structures previously much more difficult to access [30,31]. In this study we have applied radiography technique (shadowgraphy) in which the gas target is backlighted with EUV pulses at 13.5 nm wavelength.…”

Extreme ultraviolet and soft X-ray imaging with compact, table top laser plasma EUV and SXR sources

“…For even larger distances $3 mm from the nozzle the tertiary jets are forming as well, being a result of collision between the secondary jets. Detailed study of gas backing pressure dependence on the target formation and target density estimation based on 2-D transmission map can be found elsewhere [62,63]. Standard reconstruction algorithm is based on inverse Radon Transform (IRT).…”

Plasma density shaping for attosecond electron bunch generation

“…A simple 2D shadowgram is recorded, although in the future a full 3D tomography will be measured. 13 A shadowgraph of a helium triple gas jet target with 8 bar backing pressure, has been measured with the gas off and then with gas on. An average of 5 images is recorded, each consisting of 3 shot exposures to minimise data variance.…”