Directional properties of hard x-ray sources generated by tightly focused ultrafast laser pulses

Bixue Hou; Mordovanakis, Aghapi; Easter, James; Krushelnick, Karl; Nees, John A.
November 2008
Applied Physics Letters;11/17/2008, Vol. 93 Issue 20, p201503
Academic Journal
Directional properties of ultrafast laser-based hard x-ray sources are experimentally studied using tightly focused approximately millijoule laser pulses incident on a bulk Mo target. Energy distributions of Kα and total x rays, as well as source-size distributions are directionally resolved in vacuum and in flowing helium, respectively. Directional distributions of x-ray emission is more isotropic for p-polarized pump than for s-polarized. Based on source-size measurements, a simple two-location model, with expanded plasma and bulk material, is employed to represent the x-ray source profile.


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