Abstract
We examine the generation of axially modulated plasmas produced from cluster jets whose supersonic flow is intersected by thin wires. Such plasmas have application to modulated plasma waveguides. By appropriately limiting shock waves from the wires, plasma axial modulation periods can be as small as 70 μm, with plasma structures as narrow as 45 µm. The effect of shocks is eliminated with increased cluster size accompanied by a reduced monomer component of the flow.
Highlights
Axially-modulated plasma waveguides have been proposed as a means of quasi-phase matching laser plasma interactions for applications including short wavelength generation [1] and direct acceleration of electrons by a high intensity laser pulse [2, 3]
We showed that a gas cluster jet is an efficient medium in which to produce laser-generated plasma waveguides [4, 5]
We demonstrated a technique for producing axial modulations in cluster-based plasma waveguides by periodically obstructing the cluster flow using an array of thin wires [7]
Summary
Axially-modulated plasma waveguides have been proposed as a means of quasi-phase matching laser plasma interactions for applications including short wavelength generation [1] and direct acceleration of electrons by a high intensity laser pulse [2, 3]. We showed that a gas cluster jet is an efficient medium in which to produce laser-generated plasma waveguides [4, 5]. This idea was later pursued by others [6]. We demonstrated a technique for producing axial modulations in cluster-based plasma waveguides by periodically obstructing the cluster flow using an array of thin wires [7]. This is a simple alternative to demonstrated optical techniques which axially modulate laser intensity at the target [2, 8]. By optimizing the cluster jet density and temperature, we have been able to achieve plasma guiding structures with modulation periods as small as μm and plasma structures as narrow as 45 μm
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