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Nonlinear photoionization of transparent solids: a nonperturbative theory obeying selection rules
Докладчик(и): Щебланов Н.С. (Université Paris-Est, Laboratoire NAVIER (UMR 8205), France) Авторы: N.S. Shcheblanov, M.E. Povarnitsyn, P.N. Terekhin, S. Guizard, A. Couairon Дата, время проведения: 24 февраля 2022 года (четверг) в 11:00 Адрес: Семинар будет проводиться в режиме online через программу Zoom Аннотация. We present a nonperturbative theory for photoionization of transparent solids, which consistently accounts for the selection rules related to the parity of the number of absorbed photons (odd or even). We derive closed-form analytical expressions for the photoionization rate within the two-band structure model. Our model exhibits good agreement with measurements for the frequency dependence of the two-photon absorption and nonlinear refractive index coefficients in sapphire and silica. It is demonstrated the crucial role of the interference of the transition amplitudes, which in the semiclassical limit can be interpreted in terms of interfering quantum trajectories that were disregarded in Keldysh’s foundational work of laser physics [Keldysh, Sov. Phys. JETP 20, 1307 (1965)], resulting in the violation of selection rules. Подключиться к конференции Zoom https://us02web.zoom.us/j/3853805150?pwd=VERsRXkzcW5IVEgyU2ZpVWlra0hwdz09 Идентификатор конференции: 385 380 5150 Код доступа: BibermanLM Ссылка на Youtube |