XUV amplification in cylindrically expanding laser plasmas

This invited paper describes recent experimental results demonstrating amplification of spontaneous emission in the XUV spectral regions. The gain medium is a rapidly expanding recombining cylindrical plasma produced by laser irradiation of thin fiber targets. Moderately larger laser gain between 1–5 cm−1 has been observed in transitions of hydrogenic (C VI and F IX) and Li‐like (AL XI and CI XV) ions. This work hs been carried at the Central Laser Facility of the Rutherford Appleton Laboratory by various groups using the high power VULCAN laser.