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Generation of high-order harmonics with tunable photon energy and spectral width using double pulses

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Amelle Zair, Lenard Gulyas Oldal, Tamas Csizmadia, Peng Ye, Nandiga Gopalakrishna Harshitha, Subhendu Kahaly, Katalin Varju, Miklos Fule, Balazs Major

Original languageEnglish
Article number013504
JournalPhysical Review A
Issue number1
Published6 Jul 2020

King's Authors


This work theoretically investigates high-order harmonic generation in rare-gas atoms driven by two temporally delayed ultrashort laser pulses. Apart from their temporal delay, the two pulses are identical. Using a single-atom model of the laser-matter interaction it is shown that the photon energy of the generated harmonics is controllable within the range of one eV - a bandwidth comparable to the photon energy of the fundamental field - by varying the time delay between the generating laser pulses. It is also demonstrated that high-order harmonics generated by double pulses have advantageous characteristics, which mimick certain properties of an extreme ultraviolet monochromator. With the proposed method, a simpler setup at a much lower cost and comparatively higher spectral yield can be implemented in contrast to other approaches.

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