Spectroscopic Investigations of an Optical-Fieldionized X-Ray Laser with a Microcapillary Target
The use of optical field ionization (OFI) for the production of plasma media of recombination-pumped x-ray lasers introduces some favorable characteristics. The first advantage is that it is possible to produce population inversion with respect to the ground state of an ion,1,2 because the OFI and the following three-body recombination processes are faster than radiative decay rates of the relevant resonance lines. This leads to a laser transition with a much shorter wavelength compared with that between excited states. The second advantage is that x-ray lasers by OFI could be operated more efficiently than ones pumped by conventional electron collisional ionization because of their high quantum efficiency and the controllability of plasma characteristics.
KeywordsSmall Signal Gain Radiative Decay Rate Preform Plasma High Intensity Laser Pulse Linear Diode Array
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