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Hohlraum Target for Overcoming Refractive Losses in Plasma X-ray Lasers

Type of publication Peer-reviewed
Publikationsform Original article (peer-reviewed)
Publication date 2013
Author Masoudnia Leili, Bleiner Davide,
Project "ELAN" - EUV Laser for Actinic Nano-imaging.
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Original article (peer-reviewed)

Journal Laser Physics
Volume (Issue) 23
Page(s) 056003
Title of proceedings Laser Physics

Abstract

Refractive losses in laser-produced plasmas used as gain media are caused by electron density gradients, and limit the energy transport range. The pump pulse is thus deflected from the high-gain region and the short wavelength laser signal also steers away, causing loss of collimation. A Hohlraum used as a target makes the plasma homogeneous and can mitigate refractive losses by means of wave-guiding. A computational study combining a hydrodynamics code and an atomic physics code is presented, which includes a ray-tracing modeling based on the eikonal theory of the trajectory equation. This study presents gain calculations based on population inversion produced by free-electron collisions exciting bound electrons into metastable levels in the 3d9 4d1 (J = 0) → 3d9 4p1 (J = 1) transition of Ni-like Sn. Further, the Hohlraum suggests a dramatic enhancement of the conversion efficiency of collisionally excited x-ray lasing for Ni-like Sn.
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