Characterization of pulsed gas sources for intense laser field - atom interaction experiments

Abstract

Characterization of pulsed gas sources for intense laser field-atom interaction experiments.

Multiple ionization of argon via multi-XUV-photon absorption induced by 20-GW high-order harmonic laser pulses

“…The values are in agreement with those reported in Ref. [22] where piezo-based pulsed nozzles have been used. The gas jets were placed on x, y, and z translation stages with the movement on the x and y axes being manually controlled, while the displacement along the propagation z axis was done by a motorized translation stage using ≈ 0.75-cm steps (the minimum step of the stage was 5 μm).…”

Spatial Coherence Measurement of Soft X-Ray Radiation Produced by High Order Harmonic Generation

“…A 30% initial density ramp is placed across the 70 mm Gaussian focal spot in one spatial direction. (This density profile is chosen for illustrative purposes only, but it is not unreasonable to assume that gas density variations of this order can occur across the profile of the gas jet output at the high backing pressure used in our experiment [14].) As shown in Fig.…”

Two-Photon Ionization of He through a Superposition of Higher Harmonics

“…The He pressure at the interaction volume is estimated to be 3 Torr [21]. Thus, the atomic density at room temperature is N a 10 17 atoms=cm 3 .…”

“…Thus, the atomic density at room temperature is N a 10 17 atoms=cm 3 . The longitudinal extent of the interaction region is obtained from the divergence angle of the atomic beam, which is 28 for this type of gas jet with flow collimator [21]. Accordingly, the interaction length is 1:0 mm.…”