Summary: Achievements and Perspectives
We summarize the achievements of harmonic generation in the extended plasmas. Long plasmas have proven to be an interesting object of studies using the high-order nonlinear optical spectroscopy method. The book demonstrates how one can improve plasma HHG
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Summary: Achievements and Perspectives
This book is about the amendments of the nonlinear optical response of extended plasma medium in the field of intense laser radiation. Long plasmas have proven to be an interesting object of studies using the high-order nonlinear optical spectroscopy method. The book demonstrates how one can improve plasma HHG through the double excitation of laser-produced plasmas (i.e. double-pulse method), optimization of the longitudinal harmonic generation schemes in the laser plume, use of multi-component plasma plumes, optimization of the ablation of nanostructured targets, formation of QPM conditions in complex extended and perforated plasmas, provision of a regime of waveguide pump propagation through the plasma medium, use of non-metals as the ablating targets, etc. The book follows the logic of developments of the emerging field of nonlinear optical studies of the extended plasma media. Below, I summarize the achievements of extended plasma HHG described in this book and discuss the future developments in this field. The main goal of the description of HHG in narrow plasmas was to acquaint the reader with most advanced results of this technique achieved so far using the 0.3–0.5 mm long plasma plumes. While presenting the overview of previous results of plasma harmonic studies, we also showed recent developments in this field. Among them are (1) the measurements of the spatial coherence of the high-order harmonics generating in laser-produced narrow plasma plumes in the cases of resonant and non-resonant harmonics; (2) the application of femtosecond and picosecond laser pulses for plasma formation on the surfaces of metal targets for the high-order harmonic generation using the 1 kHz laser systems; (3) definitions of the concentrations of neutrals and ions of various plasma formations; (4) the analysis of the enhanced 11th harmonic (96.7 nm), which originated from the resonanceinduced growth of the nonlinear optical response of lead plasma at the wavelength of the strong ionic transitions of this metal; (5) the superior harmonic intensity from an aluminum cluster containing plasma compared to atomic Al plumes. The HHG in partially ionized narrow plasmas was actively developed during last few years in different laboratories worldwide. The developments in this area allow us to expect further amendments to this technique of coherent short-wavelength radiation generation. It follows from the overview of plasma harmonics that recent investigations in this area of nonlinear optics are making rapid strides and may © Springer Science+Business Media Singapore 2016 R.A. Ganeev, Frequency Conversion of Ultrashort Pulses in Extended Laser-Produced Plasmas, Springer Series on Atomic, Optical, and Plasma Physics 89, DOI 10.1007/978-981-10-0194-9_8
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8 Summary: Achievements and Perspectives
bring new success in the near future. The achievements in present-day plasma harmonic studies motivate further development of this technique. It has become obvious that plasma HHG is not simply another me
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