mireabulletinRussian Technological JournalRussian Technological Journal2782-32102500-316XRTU MIREA10.32362/2500-316X-2017-5-2-22-31mireabulletin-53Research ArticleМИКРО- И НАНОЭЛЕКТРОНИКА. ФИЗИКА КОНДЕНСИРОВАННОГО СОСТОЯНИЯMICRO- AND NANOELECTRONICS. CONDENSED MATTER PHYSICSГЕНЕРАЦИЯ ВТОРОЙ ОПТИЧЕСКОЙ ГАРМОНИКИ В ЦЕНТРОСИММЕТРИЧНОМ АНТИФЕРРОМАГНЕТИКЕ LaFeO3SECOND HARMONIC GENERATION IN THE CENTROSYMMETRIC ANTIFERROMAGNET LaFeO3БуряковА. М.BuryakovA. M.bello16@mail.ruМосковский технологический университетРоссияMoscow Technological UniversityRussian Federation201728042017522231Copyright © Буряков А.М., 20172017Буряков А.М.Buryakov A.M.Данная работа распространяется под лицензией Creative Commons Attribution 4.0.This work is licensed under a Creative Commons Attribution 4.0 License.https://www.rtj-mirea.ru/jour/article/view/53

В работе представлены экспериментальные и теоретические нелинейно-оптические исследования тонкой пленки центросимметричного антиферромагнетика LaFeO3, в котором электродипольная генерация второй оптической гармоники запрещена. Спектроскопические исследования показали наличие резонансной частоты в спектре генерации второй оптической гармоники (ГВГ) при энергии фотона накачки 2ћω ≈ 2.85 эВ. В результате сравнения спектра ГВГ со спектром поглощения на частоте 2ω выявлены особенности, связываемые с наличием в образце электронного перехода, приводящего к резонансной спектральной зависимости. Предложены модели для описания поляризационных зависимостей для двух длин волн лазерного излучения (нерезонансной 800 нм и резонансной 860 нм), а также для расчета компонент тензора нелинейной восприимчивости. Показано наличие магнитоиндуцированной ГВГ, проявляющейся при максимальном подавлении кристаллографического (электродипольного или электроквадрупольного) вклада путем выбора оптимальных поляризационных соотношений для волн накачки и второй гармоники.

The paper presents the results of experimental and theoretical studies of nonlinear optical properties of LaFeO3 thin film, which is antiferromagnetic and centrosymmetric, the latter provides prohibition of second harmonic generation in electric-dipole approximation. Spectroscopic studies have shown the presence of the resonant frequency in the spectrum of optical second harmonic generation (SHG) at the pump photon energy 2ћω ≈ 2.85 eV. Comparison of SHG and absorption spectra at the second harmonic wavelength, the new characteristics have been identified, related to the presence of the electronic transition which results in the resonance spectral dependence. The models were suggested for the description of the polarization dependency for the two pump laser wavelengths (non-resonant 800 nm and resonant 860 nm), as well as for the calculation of the nonlinear susceptibility tensor components. The magnetically induced SHG was observed for the conditions of maximal suppression of crystallographic (electric dipole- or electric quadruple) contribution obtained by choice of appropriate polarization rules for the pump and second harmonic waves.

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The authors declare that there are no conflicts of interest present.