摘要
Li-like ion scheme of recombination pumping mechanism is one of the most promisingapproaches to compact and efficiently saturated amplifier in the 'Water Window' spectral re-gion. Recently, numerous important investigations have been made in a number of famouslaboratories worldwide and considerable progresses have been made. However, someissues on the lasing mechanism have not been quite understood yet. Especially When one at-
基金
Project supported by the National Natural Science Foundation of China and the National High Technology Program.
