A continuous kilohertz Cu Kα source produced by submillijoule femtosecond laser pulses for phase contrast imaging

Chakera, J. A.; Ali, A.; Tsui, Y. Y.; Fedosejevs, R.
December 2008
Applied Physics Letters;12/29/2008, Vol. 93 Issue 26, p261501
Academic Journal
We report a continuously operated Cu Kα x-ray source produced by a commercial kilohertz submillijoule femtosecond laser system. The source has an x-ray conversion of ∼4×10-5 into Kα line emission at 8.05 keV. The microplasma x-ray source has a size of 8 μm (full width at half maximum) produced by focusing 260 μJ laser pulses on a moving Cu-wire target. An average photon flux of ∼1.1×109 photons/sr/s is obtained using the above laser pulses. The source has been used to record phase contrast images of test samples. This compact x-ray source can serve as a low cost operating system for phase contrast imaging in clinical applications.


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