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Study of the spatial coherence of high order harmonic radiation generated from pre-formed plasma plumes
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10.1063/1.4816253
/content/aip/journal/jap/114/3/10.1063/1.4816253
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/3/10.1063/1.4816253
View: Figures

Figures

Image of FIG. 1.
FIG. 1.

A schematic diagram of the experimental setup used for generation of the high order harmonic radiation from plasma plume and measurement of its spatial coherence.

Image of FIG. 2.
FIG. 2.

The divergence of the 11th and 19th orders of the harmonic radiation generated from pre-formed plasma plume, when the laser was focused ∼6 mm away from the plasma plume centre (fs laser intensity ∼3 × 10 W/cm). The inset shows the size of the harmonics on the detector. The divergence of the 11th harmonic was ∼8 mrad, and that of the 19th harmonic was ∼6 mrad.

Image of FIG. 3.
FIG. 3.

(a) The dispersed harmonic spectrum recorded by the XUV spectrograph; (b) The interference pattern of 11th harmonic order after inserting the double slit (slit width 30 m and separation 100 m); (c) The line profile of the interference fringes of the image b (solid line). The dashed line shows the calculated intensity profile from single slit.

Image of FIG. 4.
FIG. 4.

The variation of the harmonic intensity and the fringe visibility with the laser focal spot position (negative distance means focus the plasma plume) for the 11th harmonic, taken for a slit separation of 100 m and slit width of 30 m. The solid curves are to guide the eyes.

Image of FIG. 5.
FIG. 5.

The dependence of the fringe visibility on the harmonic order when the laser beam is focused: (a) before the plume, (b) after the plume, at plasma plume position ∼6 mm away from the laser beam focus (in either case).

Image of FIG. 6.
FIG. 6.

The variation of the fringe visibility with the slit separation, for 11th harmonic from carbon plume. The solid curve shows the Gaussian fit of the experimental data points. This curve gives an estimate of coherence radius (R).

Image of FIG. 7.
FIG. 7.

The variation of the coherence area with the harmonic order, for the harmonics generated in plasma plume of carbon (graphite).

Image of FIG. 8.
FIG. 8.

The calculated dependence of the fringe visibility on the electron density in plasma plume. At an electron density variation of ∼5×10 cm, the fringe visibility matches with the experimental value.

Image of FIG. 9.
FIG. 9.

The variation of the fringe visibility with the harmonic order, at an electron density variation of ∼5×10 cm. The solid line shows the theoretical fringe visibility calculated using Eq. (6) , and the triangles are the experimental values.

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/content/aip/journal/jap/114/3/10.1063/1.4816253
2013-07-19
2014-04-18
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Study of the spatial coherence of high order harmonic radiation generated from pre-formed plasma plumes
http://aip.metastore.ingenta.com/content/aip/journal/jap/114/3/10.1063/1.4816253
10.1063/1.4816253
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