- Conference date: 19-23 Mar 2000
- Location: Reno,Nevada (USA)
New X-ray laser schemes exploiting the fast (<10 femtosecond) decay of specific inner-shell hole states via Coster-Kronig and super Coster-Kronig decay processes are analyzed. Computer simulation for Ca and Ti shows, that population inversion can be achieved by electron collisional ionization only, and also by using fast, incoherent X-ray pumping. Macroscopically observable gain requires extremely fast energy deposition: laser produced plasma on solid density target surfaces, excited by <25 fs, Joule level optical energy. Experiments performed with the >1 J energy, compressed pulses of a chirped pulse amplification Ti:sapphire laser system, and with specially designed multilayer metal targets containing high Z (Au) radiator and low Z (Ti) emitter show anomalous spectral line enhancement in the 2–14 nm wavelength range. Threshold conditions for gain by incoherent X-ray pumping, conversion efficiency of visible laser photons into a desired X-ray bandwidth, and the design considerations of the multilayer target structure are also discussed.
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