Effects of irradiation non-uniformity on X-ray laser physics

Kieffer, Jean‐Claude; Chaker, Mohamed; Pépin, H.; Nantel, M.; Baldis, H. A.; Dunn, James P.; Enright, Gary D.; Villeneuve, D. M.

doi:10.1016/0030-4018(91)90230-b

Cited by 12 publications

(1 citation statement)

References 22 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In fact, the driving-laser beams (VULCAN for Al 10+ lines and LULI for S 13+ lines) present non-uniformities which are responsible for perturbation in plasma production and hydrodynamics. In the collisionalexcitation scheme, Kieffer et al (1991) have shown that above a threshold of driving-laser illumination such non-uniformities do not have large effects. In contrast, the recombination scheme is very sensitive to non-uniformities of target illumination, because they induce inhomogeneity of the plasma column and, as shown by Jamelot et al, opaque plasma zones which conceal amplification from the other parts.…”

Section: Linementioning

confidence: 99%

Influence of line overlapping and dynamical Stark broadening on calculated gains in soft-x-ray lasers

Benredjem¹,

Calisti²,

Stamm³

et al. 1996

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

Stark lineshapes of lasing radiation in the X - UV range in aluminium and sulphur plasmas are calculated with the help of a quick code. Intensities are then obtained from the radiative-transfer equation in the nonsaturated regime, and, in the same way as in the experiments, a gain coefficient is deduced from the variation with length of the intensity integrated over wavelength. In the cases investigated, many lasing transitions contribute to the x-ray beam, and the spectral gain as well as the emissivity have to be suitably defined. For 10.57 and 15.47 nm radiation in and 20.65 nm radiation in , the gain coefficients thus calculated are much smaller than those obtained with symmetrical Doppler profile functions. When the amplification length is increased each lineshape becomes more and more homogeneous and tends towards the shape of the most intense transition. In other words, as the beam is amplified the individual transitions, except the most intense one, contribute less and less to the output intensity. The effect of the x-ray beam on the populations of the lasing levels is investigated and a rate is calculated which is found to be much smaller than the collisional and spontaneous-emission rates, but increases rapidly with the gain - length product.

show abstract

Section: Linementioning

confidence: 99%

Influence of line overlapping and dynamical Stark broadening on calculated gains in soft-x-ray lasers

Benredjem¹,

Calisti²,

Stamm³

et al. 1996

J. Phys. B: At. Mol. Opt. Phys.

View full text Add to dashboard Cite

show abstract

Reduction of small-scale intensity modulation in a line focus produced by a cylindrical-lens array using polarization control and wedge angles

Löwenthal

Präg

Balmer

1997

Optics Communications

View full text Add to dashboard Cite

Linear laser plasma toward large-sized uniform soft X-ray source

Wang

Chen

et al. 1992

Laser Part. Beams

View full text Add to dashboard Cite

The effect of laser intensity distribution along the line focus on the uniformity of the line-shaped plasmas produced is investigated with time-integrated and time-resolved soft X-ray and optical diagnostics. Evident plasma condition nonuniformities along the line focus resulting from nonuniform laser intensity distributions have been observed with a conventional simple line-focusing technique. With a new line-focusing technique producing a uniform laser illumination, a uniform, line-shaped plasma can be obtained. It is also found that nonuniformities under uniform laser illumination occur mostly during laser heating. The line-shaped uniform laser plasma can be used as a large, uniform X-ray source besides its importance in X-ray laser demonstration and amplification. As an application of such line-shaped plasmas as X-ray sources, the no-overcoat 5F X-ray film is calibrated for the first time by a new method in the soft X-ray range from 10–80 A.

show abstract

Effects of irradiation non-uniformity on X-ray laser physics

Cited by 12 publications

References 22 publications

Influence of line overlapping and dynamical Stark broadening on calculated gains in soft-x-ray lasers

Influence of line overlapping and dynamical Stark broadening on calculated gains in soft-x-ray lasers

Reduction of small-scale intensity modulation in a line focus produced by a cylindrical-lens array using polarization control and wedge angles

Linear laser plasma toward large-sized uniform soft X-ray source

Contact Info

Product

Resources

About