1. Study of hard x-ray emission from intense femtosecond Ti:sapphire laser–solid target interactions.
- Author
-
Chen, L. M., Forget, P., Fourmaux, S., Kieffer, J. C., Krol, A., Chamberlain, C. C., Hou, B. X., Nees, J., and Mourou, G.
- Subjects
X-rays ,FEMTOCHEMISTRY ,ELECTROMAGNETIC waves ,IONIZING radiation ,ELECTRON temperature ,RESONANCE - Abstract
Interaction of intense Ti:sapphire laser with solid targets has been studied experimentally by measuring hard x-ray and hot electron generation. Hard x-ray (8–100 keV) emission spectrum and Kα x-ray conversion efficiency (η
K ) from plasma have been studied as a function of laser intensity (1017 –1019 W/cm2 ), pulse duration (70–400)fs, and laser pulse fluence. For intensity I>1×1017 W/cm2 , the Ag ηK increases to reach a maximum value of 2×10-5 at an intensity I=4×1018 W/cm2 . Hot electron temperature (KTh ) and ηK scaling laws have been studied as a function of the laser parameters. A stronger dependence of KTh and ηK as a function of the laser fluence than on pulse duration or laser intensity has been observed. The contribution of another nonlinear mechanism, besides resonance absorption, to hard x-ray enhancement has been demonstrated via hot electron angular distribution and particle-in-cell simulations. [ABSTRACT FROM AUTHOR]- Published
- 2004
- Full Text
- View/download PDF