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(a) Rough pattern of harmonic spectra from the silver plasma in the case of modulation-free laser pulse. Inset: Experimental setup of harmonic generation in laser plasma. BS, beam splitter; M, mirrors; DL, delay line; C, compressor; FL, focusing lenses; VC, vacuum chamber; XUVS, extreme ultraviolet spectrometer; CCD, charge coupled device. (b) Rough pattern of harmonic spectra obtained in the case of harmonic generation using the modulated laser pulses propagating through the telescope and filaments. Inset: Experimental setup of these experiments.
Spatial shapes of (a) laser beam after compressor and (b) laser beam after propagation of the telescope and filaments. Here, the corresponding spectral distributions of laser pulses for these two cases are also presented.
Intensity distribution of the high-order harmonics generating in the silver plasma in the cases of (1) SPM-broadened and (2) modulation-free pulses. The corresponding intensities of driving pulse in the area of plasma were (1) and (2) .
Intensity distribution of the harmonics generating in silver plasma using the radiation propagated through the air and filaments at different angles of rotation of the quarter-wave plate.
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