Isotropic and anisotropic diffraction of coherent light on periodically poled domain structures in the lithium niobate crystal

Мы сообщаем об экспериментальных исследованиях и численном анализе изотропной и анизотропной брэгговской дифракции когерентного светового пучка (λ = 655 нм), распространяющегося через периодически поляризованную доменную структуру с пространственным периодом Λ = 8,79 мкм, образованную в кристалле MgO:LiNbO3.We report on experimental investigations and numerical analysis of isotropic and anisotropic ragg diffraction for the coherent light eam (λ = 655 nm) propagating through the periodically poled domain structure with the spatial period Λ = 8.79 m formed in a MgO:LiNbO3 crystal by the electric reversal method.Работа выполнена при поддержке Минобрнауки РФ в рамках Госзадания на 2017-2019 г.г. (№. 3.8898.2017/8.9, 3.4993.2017/6.7, 3.4973.2017/7.8), РФФИ (грант № 16-29-14046-ofi_m) и Правительства РФ (акт 211, соглашение 02.A03.21.0006)

Ultra-low-power hybrid light-matter solitons.

New functionalities in nonlinear optics will require systems with giant optical nonlinearity as well as compatibility with photonic circuit fabrication techniques. Here we introduce a platform based on strong light-matter coupling between waveguide photons and quantum-well excitons. On a sub-millimetre length scale we generate picosecond bright temporal solitons at a pulse energy of only 0.5 pJ. From this we deduce a nonlinear refractive index three orders of magnitude larger than in any other ultrafast system. We study both temporal and spatio-temporal nonlinear effects and observe dark-bright spatio-temporal polariton solitons. Theoretical modelling of soliton formation in the strongly coupled system confirms the experimental observations. These results show the promise of our system as a high speed, low power, integrated platform for physics and devices based on strong interactions between photons