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http://www.szfki.hu/~icomp/icomp17/abstracts/Poster_Tue0950/006popov.pdf New approach [1,2] to study the spontaneous emission of the atomic system in the presence of the high-intensity laser field is applied to study the process of harmonic generation. The analysis is based on the consideration of quantum system interaction with quantized field modes being in vacuum state, while the intense laser field is considered classically beyond the perturbation theory. The analysis of the emission from the single atom irradiated by the high-intensity femtosecond laser pulse of Ti-Sa laser and its second harmonic is presented. It is demonstrated that not only odd but also even harmonics can be emitted if the laser field is strong enough. The origin of even harmonics is studied. The obtained results are compared with those found in the frames of semiclassical approach widely used to study the harmonic generation. It is found that semiclassical approach is inapplicable in the strong-field limit. References [1] A.V. Bogatskaya, E.A. Volkova and A.M. Popov EPL 116, 14003 (2016). [2] A.V. Bogatskaya, E.A. Volkova and A.M. Popov Laser Phys. Lett. 14, 055301 (2017). References