12 April 2005 Attosecond x-ray laser pulses
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We propose to generate few-fs or as X-ray laser pulses by beating of two or more X-ray laser lines with appropriate frequency separation. X-ray lasers operating on transitions in neon- or nickel-like ions typically have gain on several lines with difference frequencies of around 1015 Hz. Moreover, it is found in specific cases that a few almost equidistant lines may exhibit gain. Beating of these lines results in a series of pulses with durations down to the attosecond range. It is shown that phase locking can be achieved by means of a Langmuir wave in the X-ray laser medium itself, which is resonant with the difference frequency.
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Riccardo Tommasini, Riccardo Tommasini, Ernst Fill, Ernst Fill, "Attosecond x-ray laser pulses", Proc. SPIE 5708, Laser Resonators and Beam Control VIII, (12 April 2005); doi: 10.1117/12.603518; https://doi.org/10.1117/12.603518


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