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Open AccessArticle

Optimum Pump Pulse Duration for X-Ray Ar-Plasma Lasing

Empa- Swiss Federal Laboratories for Materials Science and Technology, Überlandstrasse 129, Dübendorf CH-8600, Switzerland
Institute of Applied Physics, University of Bern, Sidlerstrasse 5, Bern CH-3012, Switzerland
Author to whom correspondence should be addressed.
Photonics 2015, 2(1), 164-183;
Received: 22 December 2014 / Accepted: 29 January 2015 / Published: 10 February 2015
(This article belongs to the Special Issue Extreme UV Lasers: Technologies and Applications)
In plasma-driven X-ray lasers, it is critical to optimize the duration and time delay between pump pulses. In this study, we have done parametric simulations in order to systematically investigate the optimum time configuration of pump pulses. Here, we are mainly interested in soft X-ray lasers created using a Ar target irradiated with laser pulses, which operate at a wavelength \(\lambda=46.9\) nm in the \(2p^5 3p^1(J=0)\rightarrow 2p^5 3s^1(J=1)\) laser transition. It is shown that the optimum time scale required to achieve Ne-like ions, as well as the time required to generate a population inversion depend on the combined effect of the electron temperature and electron density. The electron density and temperature are respectively a factor of \(\approx\)\(2.1\)- and \(\approx\)\(5\)-times higher in the case of a short pulse of \(0.1\) ps in comparison to a long pulse of 1,000 ps (at a constant fluence). The most effective lasing happens with short pulses with a pulse duration comparable to the total relaxation time from the upper level, namely \(\Delta\tau_p\leq35\) ps. Power laws to predict the optimum laser intensity to achieve Ne-like \(Ar^{+8}\) are obtained. View Full-Text
Keywords: plasma-driven X-ray lasers; \(Ar^0\) target; ionization time; pumping time; relaxation time plasma-driven X-ray lasers; \(Ar^0\) target; ionization time; pumping time; relaxation time
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Masoudnia, L.; Bleiner, D. Optimum Pump Pulse Duration for X-Ray Ar-Plasma Lasing. Photonics 2015, 2, 164-183.

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