We have demonstrated efficient conversion of ultrashort-pulse laser energy to x rays with energies above 1 keV, using laser-produced plasmas generated on a variety of microstructured surfaces. Lithographically produced grating targets generated 0.1 mJ of kilo-electron-volt x rays, and porous gold and aluminum targets emitted 1 mJ. This represents an improvement of a factor of 100 over flat targets. The K-shell emission spectrum of porous aluminum was composed primarily of heliumlike spectral lines.
© 1994 Optical Society of America
S.P. Gordon, T.D. Donnelly, A. Sullivan, H. Hamster, R.W. Falcone, "X-rays from Microstructured Targets Heated by Femtosecond Lasers," Opt. Lett. 19, 484 (1994). doi: 10.1364/OL.19.000484