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Generation of hard x rays by femtosecond laser pulse interaction with Cu in laminar helium flow in ambient air

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4 Author(s)
Hou, Bixue ; FOCUS Center and the Center for Ultrafast Optical Science, University of Michigan, 2200 Bonisteel Blvd, Ann Arbor, Michigan 48109-2099, USA ; Easter, James ; Krushelnick, Karl ; Nees, John A.

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Hard x rays are generated in laminar helium flow in atmosphere (without a vacuum vessel) through the interaction of tightly focused 35 fs laser pulses of varying energy with a Cu target. The energy conversion efficiency from laser to x rays is measured to be 5.4×10-6, giving a flux of 5.9×109 photons/s into sr from a source measuring approximately 9×12 μm2 in size (vertical×horizontal). Results are compared to those measured in vacuum and in static helium environments.

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Applied Physics Letters  (Volume:92 ,  Issue: 16 )