Third-order Nonlinear Optical Properties Of The Glass-ceramics Containing Transition Metal Oxide

The development of optical communication and laser technology are significantly benefited from various nonlinear optics.Most of the inactive photonic devices,such as all-optical switchers,wavelength converters and pulse modulators,involve in third-order nonlinear optical properties and supported by nonlinear optical materials.Thus,it is an important topic to design and fabricate novel third-order nonlinear materials.As a typical nonlinear optical materials,the oxide glasses containing highly polarized ions or groups are ideal material candidates for construction of non-linear optical devices,due to their excellent non-linear optical response,low optical loss,high optical damage threshold and excellent mechanical properties.In this thesis,the relationship between the configuration of the local structural units and the corresponding nonlinear optical response were studied.It is important to find that the formation of[TiO₆]units and their organization is beneficial for improvement of non-linear optical properties.Several novel glasses candidates with excellent non-linear optical performance were successfully fabricated.The research results provide valuable reference for future exploration of novel non-linear optical materials.In detail:1.The relationship between Ti-O topological configuration and non-linear optical response in titanate glass was studied.The theoretical and experimental analysis demonstrate that the[TiO₆]containing glass exhibit the strongest nonlinear property.The results indicate that the configuration of transition metal elements in glass is a crucial factor influencing the nonlinearity.2.Nano crystallization was performed in borotitanate glass-ceramics to trigger local organization of[TiO₆]units.The Z-scan measurement was conducted and the results prove that the approach significantly enhance the third-order nonlinear optical property of the glass-ceramics.In addition,the strategy can also greatly improve the mechanical and laser damage threshold of the samples.3.Crystallization mediated enhancement of nonlinear optical response was also applied to niobiate-silicate glass-ceramics successfully.It was found that both the third-order nonlinear optical properties and the mechanical and laser damage resistance have been significantly improved.In addition,the glass ceramics exhibit excellent optical limiting performance,which should be associated with the existence of high-polarizability components in the glass system.4.A novel transparent glass-ceramics embedded with ZnO and Ag nanocrystals were designed and fabricated successfully.The multiphase glass-ceramics show broadband nonlinear optical response.The demonstration experiments by using Z-scan measurement clearly show this unique glass-ceramics exhibit strong third-order nonlinear absorption in the 530-900 nm waveband.This material candidate is promising for application in the broadband nonlinear optical component or device.