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

Masoudnia, Leili; Bleiner, Davide (2013). Hohlraum Target for Overcoming Refractive Losses in Plasma X-ray Lasers. Laser physics, 23(5), 056003. MAIK Nauka/Interperiodica 10.1088/1054-660X/23/5/056003

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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 3d94d1(J = 0) → 3d94p1(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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