The Generation And Manipulation Of Optical Angular Momentun Using The Domain Inversion Crystal

Domain inversion crystal is a kind of crystal with its domain structure periodically distributed, such as periodically poled lithium niobate. It has been widely used in nonlinear process(e.g. second harmonic generation, difference frequency ), because the periodical inversion of even order tensor (e.g. nonlinear coefficients, electro-optics coefficients, piezoelectric coefficients, and photovoltaic coefficients) can compensate the nonlinear phase mismatch. In this thesis, the discuss the Domain inversion crystal electro-optic coefficient will be reversed as the crystal cycle, this paper describes the crystal domain inversion to achieve electro-optic effect in optical transverse spin angular momentum, orbital angular momentum of the generation and regulation.When the domain inversion is used to control the spin angular momentum, we found the output left-handed circularly polarized photon, right-handed polarized photon and the total spin angular momentum vary with external electric field, operating wavelength, and operating temperature. When the incident light is polarized and work at quasi-phase matched wavelength, the output light keeps linearly polarized and the total angular momentum keeps zero, but the polarized direction would rotate an angle with the external electric field. When the domain crystal contains odd domains, it possesses character which is similar to the Faraday rotation effects and it can be used in optical isolator and optical circulator. We also investigate the evolution of polarization state and spin angular momentum of light when it passes the crystal.When we set the structure of domain spiral shape, the light will possess spiral character of crystal by transverse electro-optics effect. It can be used as an optical vortex adder and subtractor to change the optical angular momentum of light.