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Photopumping of XUV lasers by XFEL radiation

Published online by Cambridge University Press:  01 July 2004

KE LAN ,
ERNST FILL  and
JÜRGEN MEYER-TER-VEHN
KE LAN
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
ERNST FILL
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
JÜRGEN MEYER-TER-VEHN
Affiliation:
Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany
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Abstract

Within the next few years X-ray free-electron lasers (XFELs) now under construction are expected to generate highly collimated XUV pulses with 1013 photons and a duration of 100 fs. Focusing this radiation to a spot some 10 μm in diameter generates intensities of up to 1016 W/cm2. Such pump intensities make feasible the investigation of photopumped XUV lasers using this radiation. We present simulations taking into account two different mechanisms generating the gain: (1) photoionization with subsequent three-body recombination, which takes advantage of the monochromaticity of the pump radiation to generate very cold electrons; (2) inner-shell ionization in which transient inversion is obtained by generating a hole in an otherwise completely filled shell. The simulations show that under appropriate conditions both mechanisms generate very high gain. However, a number of further issues must be considered, such as the propagation of the pump pulse in the medium to be pumped.

Keywords

PhotopumpingX-ray free-electron laserX-ray laser
Type
Research Article
Information
Laser and Particle Beams , Volume 22 , Issue 3 , July 2004 , pp. 261 - 266
Copyright
© 2004 Cambridge University Press

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References

REFERENCES

Bunkin, F.Y., Derzhiev, V.I. & Yakovlenko, S.I. (1981). Specifications for pumping x-ray laser with ionizing radiation. Sov. J. Quantum Electron 11, 971–972.Google Scholar
Duguay, M.A. & Rentzepis, P.M. (1967). Some approaches to vacuum UV and X-ray lasers. Appl. Phys. Lett. 10, 350–352.Google Scholar
Elton, R.C. (1990). X-ray Lasers. San Diego: Academic Press.
Gerth, C. (2001). Free-electron laser at the TESLA Test Facility at DESY. Soft X-ray Lasers and Applications IV, (E.E. Fill & J.J. Rocca eds.). San Diego, SPIE 4505, 131–145.
Goett, S.J., Clark, R.E.H. & Sampson, D.H. (1980). Intermediate coupling collision strengths for Δn = 0 transitions produced by electron impact on highly charged He- and Be-like ions. Atomic Data and Nucl. Data Tables 25, 185–217.Google Scholar
Goodwin, D.G. & Fill, E.E. (1988). Inversion and gain in hydrogenic ion levels induced by photoionization pumping. J. Appl. Phys. 64, 1005–1014.Google Scholar
Goodwin, D.G. & Fill, E.E. (1990). Soft X-ray gain in hydrogenic ions: Line pumping, ionization pumping and transient excitation. Appl. Phys. B 50, 177–185.Google Scholar
Griem, H.R. (1974). Spectral line broadening by Plasmas. New York and London: Academic Press.
Lan, K., Fill, E.E. & Meyer-ter-Vehn, J. (2003). Simulation of He-α and Lyman-α soft x-ray lasers in helium pumped by DESY/XFEL-ratiation. Europhys. Lett. 64, 454–460.Google Scholar
Lan, K. & Zhang, Y. (2002). Theoretical studies of aluminum wire array Z-pinch implosions with varying masses and radii. Eoru Phys. J. AP 19, 103–112.Google Scholar
Lan, K., Zhang, Y. & Zheng, W. (1999). Theoretical study on dischard-pumped soft x-ray laser in Ne-like Ar. Phys. of Plasmas 6, 4343–4348.Google Scholar
Li, Y., Schillinger, J., Ziener, C. & Sauerberry, R. (1997). Reinvestigation of the Duguay soft X-ray laser: A new parameter space for high power femtosecond laser pumped systems. Opt. Commun. 144, 118–124.Google Scholar
MacGowan, B.J., Da Silva, L.B., Fields, D.J., Keane, C.J., Koch, J.A., London, R.A., Matthews, D.L., Maxon, S., Mrowka, S., Osterheld, A.L., Scofield, J.H., Shimkaveg, G., Trebes, J.E. & Walling, R. (1992). Short wavelength x-ray laser research at the Lawrence Livermore National Laboratory. Phys. Fluids B 4, 2326–2337.Google Scholar
Materlik, G. & Tschentscher, T. (2001). TESLA Technical Design Report, Part V, DESY, Hamburg.
Tallents, G.J. (2003). The physics of soft x-ray lasers pumped by electron collisions in laser plasmas. J. Phys. D 36, R259–R276.Google Scholar