1 November 1997 Traveling wave-pumping of ultra-short-pulse x-ray lasers
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Pumping of proposed inner-shell photo-ionized (ISPI) x-ray lasers places stringent requirements on the optical pump source. We investigate these requirements for an example x-ray laser (XRL) in Carbon lasing on the 2p - 1s transition at 45 angstrom. Competing with this lasing transition is the very fast auger decay rate out of the upper lasing state, such that the x-ray laser would self-terminate on a femto-second time scale. XRL gain may be demonstrated if pump energy is delivered in a time short when compared to the auger rate. The fast self-termination also demands that we sequentially pump the length of the x-ray laser at the group velocity of the x- ray laser. This is the classical traveling wave requirement. It imposes a condition on the pumping source that the phase angle of the pump laser be precisely de-coupled from the pulse front angle. At high light intensities, this must be performed with a vacuum grating delay line. We also include a discussion of issues related to pump energy delivery, i.e. pulse-front curvature, temporal blurring and pulse fidelity. An all- reflective optical system with low aberration is investigated to see if it fulfills the requirements. It is expected that these designs together with new high energy (greater than 1 J) ultra-short pulse (less than 40 fs) pump lasers now under construction, may fulfill our pump energy conditions and produce a tabletop x-ray laser.
© (1997) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Richard A. Snavely, Richard A. Snavely, Luiz Barroca Da Silva, Luiz Barroca Da Silva, David C. Eder, David C. Eder, Dennis L. Matthews, Dennis L. Matthews, Stephen J. Moon, Stephen J. Moon, "Traveling wave-pumping of ultra-short-pulse x-ray lasers", Proc. SPIE 3156, Soft X-Ray Lasers and Applications II, (1 November 1997); doi: 10.1117/12.293374; https://doi.org/10.1117/12.293374


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