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Experimental setup: (TS) target chamber; (T) target; (S) slit; (CM) gold-coated cylindrical mirror; (GIS) grazing-incidence spectrometer; (MCP) microchannel plate; (CCD) charge-coupled device; (FP) femtosecond pulse; (PP) picosecond pulse.
(a) 19th harmonic intensity as a function of the delay between prepulse and main pulse, and (b) emission spectrum of chromium plasma in the visible range at optimal conditions of frequency conversion. .
(a) Harmonic and (b) emission spectra from chromium plasma in XUV range; (c) high-order harmonic intensity distribution in the plateau region.
Comparison of harmonic spectra from (a) chromium and (b) boron plumes.
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