The construction of short-pulse tunable soft x-ray free electron laser sources based on the self-amplified spontaneous emission process will provide a major advance in capability for dense plasma-related and warm dense matter (WDM) research. The sources will provide 10<sup>13</sup> photons in a 200-fs duration pulse that is tunable from approximately 6 to 100 nm. Here we discuss only two of the many applications made possible for WDM that has been severely hampered by the fact that laser-based methods have been unavailable because visible light will not propagate at electron densities of n<sub>e</sub>≥10<sup>22</sup> cm<sup>−3</sup>. The next-generation light sources will remove these restrictions.
© 2003 Optical Society of America
(140.7240) Lasers and laser optics : UV, EUV, and X-ray lasers
(300.6560) Spectroscopy : Spectroscopy, x-ray
(340.0340) X-ray optics : X-ray optics
(340.6720) X-ray optics : Synchrotron radiation
(350.5400) Other areas of optics : Plasmas
Richard W. Lee, Stephen J. Moon, Hyun-Kyung Chung, Wojciech Rozmus, Hector A. Baldis, Gianluca Gregori, Robert C. Cauble, Otto L. Landen, Justin S. Wark, Andrew Ng, Steven J. Rose, Ciaran L. Lewis, Dave Riley, Jean-Claude Gauthier, and Patrick Audebert, "Finite temperature dense matter studies on next-generation light sources," J. Opt. Soc. Am. B 20, 770-778 (2003)