Study On Excitation Of Photorefractive Surface Solitons And Its Regulation And Applications In Second Harmonic Generation

The photorefractive surface soliton is one of the photorefractive solitons which propagates along the interface of the photorefractive crystal. This kind of the soliton is induced by the balance of the gravitation of the self-blend and the exclusion of the boundary. The photorefractive surface soliton, which combines the diffusion nonlinear, drift nonlinear and the merit of the nature straight path of the surface, focuses the power of the beam into the surface of the crystal and let the beam go straight along the surface, both of these enhance many nonlinear phenomena of the crystal. It has great potential in the applications of the surface optics, nonlinear optics, beam-coupling and integrated optics.In this paper, we will study the mode, transmission, stability and stimulation arouse the photorefractive surface soliton. The main sontents are as follows:(1) Design method of the regulation of surface soliton propagation and size controlling. Simulate the surface screening soliton propagation based on the Beam Propagation Method, The size and trajectory of photorefractive surface solition can be modulated by launch position, applied external electric field and relative light intensity in theory and experiment.(2) Put forward the surface dark soliton, and study the mode, transimission, stability and stimulation of the surface dark soliton in theory. Realized the reflection and excitation of the photorefractive surface dark soliton at the boundary under the diffusion-photovoltaic system in experiment.(3) Realized the restrain of the snake instability by the surface dark soliton. Verify the effect of potential field to the modulation instability.(4) Induce the optics waveguide by the surface soliton. Realized the electric fixing and scrubing of the waveguide.The innovations of this paper: 1. The first experimental observation of the photorefractive surface soliton excitation, and the guided wave.2. First discovery of the inhibition of snake stability by the surface.3. Firstly experimently achieved the comprehensive regulation of the photorefractive surface soliton, such as the redulation of the incident position, incident light intensity, background intensity and electric field.