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Issue 9, 2026
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Reviews of topical problems


Generation of higher harmonics in laser-induced plasma

† 
Institute for Advanced Studies, New Uzbekistan University, Tashkent, Uzbekistan

Coherent sources of the short-wavelength (2—120 nm) radiation range are increasingly being used both in fundamental research and for practical purposes. One of the most effective methods of generating such extreme ultraviolet radiation is the generation of high-order harmonics of ultrashort laser pulses. This review presents studies of the generation of high-order harmonics of femtosecond pulses in laser-induced plasma, starting with the first demonstration of this process under optimal conditions of plasma plume formation (Optics Letters 30 768 (2005)) and up to the most recent studies. The achievements of this method of converting the wavelength of intense laser sources into the extreme ultraviolet range of the spectrum are analyzed. Special attention is paid to new techniques to increase the efficiency of harmonic conversion. In particular, successes are demonstrated in such areas as (i) resonant amplification of single harmonics, (ii) amplification of harmonic groups caused by quasi-phase matching of interacting waves in various spectral ranges, (iii) two- and three-color plasma pumping to generate odd and even harmonics and parametric waves, (iv) the use of quantum dots and nanoparticles for amplification of harmonics of lower orders and other results. The prospects and potential applications of this method of generating coherent shortwave radiation in the extreme ultraviolet region of the spectrum are discussed. It also compares with another methods of harmonics generation.

Typically, an English full text is available in about 1 month from the date of publication of the original article.

Correspondence should be addressed to
Keywords: generation of high-order harmonics, laser plasma, extreme ultraviolet radiation, resonant harmonic amplification, quasi-phase matching, two-color pump of plasma, nanoparticles, conversion efficiency
PACS: 42.65.Ky, 42.79.Nv, 52.50.Jm (all)
DOI: 10.3367/UFNe.2026.04.040135
URL: https://ufn.ru/en/articles/2026/9/b/
Citation: Ganeev R A "Generation of higher harmonics in laser-induced plasma" Phys. Usp. 69 (9) (2026)

Received: 22nd, January 2026, revised: 30th, April 2026, 30th, April 2026

Оригинал: Ганеев Р А «Генерация высших гармоник в лазерно-индуцированной плазме» УФН 196 938–964 (2026); DOI: 10.3367/UFNr.2026.04.040135

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