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

Gulyás Oldal, Lénárd and Csizmadia, Tamás and Ye, Peng and Nandiga Gopalakrishna, Harshitha and Zair, Amelle and Kahaly, Subhendu and Varjú, Katalin and Füle, Miklós Jenő and Major, Balázs (2020) Generation of high-order harmonics with tunable photon energy and spectral width using double pulses. PHYSICAL REVIEW A, 102 (1). ISSN 2469-9926

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Abstract

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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