Starting from piezoelectric crystal dynamic equation etc., both the electric potential and surface charge induced by the incident wave are obtained with electrical boundary perturbation technique. The scattered waves ...Starting from piezoelectric crystal dynamic equation etc., both the electric potential and surface charge induced by the incident wave are obtained with electrical boundary perturbation technique. The scattered waves are then derived including both surface and bulk waves through integral transformation with the induced charge as exciting source.The scattered surface waves from the grating on YZ-LiNbO3 are then numerically calculated, and both the reflective and forward scattering coefficients are given vs. the strip width. Furthermore, the surface wave phase velocity change when passing the grating is derived and numerically calculated too. The theoretical prediction agrees well with measured results.展开更多
A phase-diffractive optical element is designed to measure the topological charge of optical vortices. We use the scalar diffraction theory to calculate the far-field diffraction patterns. The simulation results show ...A phase-diffractive optical element is designed to measure the topological charge of optical vortices. We use the scalar diffraction theory to calculate the far-field diffraction patterns. The simulation results show that almost all of the power of the incident beams is diffracted to the same diffraction order, and this approach is also effective for multi-ring optical vortices. We upload this phase-diffractive optical element on the liquid crystal spatial light modulator to do the experiment. The observed far-field diffraction patterns fit well with the simulation results.展开更多
A beam combination setup for a dual-frequency laser with orthogonal linear polarization is proposed. It consists of two polarizing beam splitters（PBSs） whose polarization axes are orthogonal to each other. A theoret...A beam combination setup for a dual-frequency laser with orthogonal linear polarization is proposed. It consists of two polarizing beam splitters（PBSs） whose polarization axes are orthogonal to each other. A theoretical analysis demonstrates that a combined dual-frequency laser beam with this setup strictly meets orthogonal linear relation. The experimental results show that compared with the conventional setup, the ellipticity and nonorthogonality of the combined dual-frequency laser beam are significantly reduced.展开更多
文摘Starting from piezoelectric crystal dynamic equation etc., both the electric potential and surface charge induced by the incident wave are obtained with electrical boundary perturbation technique. The scattered waves are then derived including both surface and bulk waves through integral transformation with the induced charge as exciting source.The scattered surface waves from the grating on YZ-LiNbO3 are then numerically calculated, and both the reflective and forward scattering coefficients are given vs. the strip width. Furthermore, the surface wave phase velocity change when passing the grating is derived and numerically calculated too. The theoretical prediction agrees well with measured results.
基金supported by the National Basic Research Program of China(973 program)under Grant Nos.2014CB340002 and 2014CB340004
文摘A phase-diffractive optical element is designed to measure the topological charge of optical vortices. We use the scalar diffraction theory to calculate the far-field diffraction patterns. The simulation results show that almost all of the power of the incident beams is diffracted to the same diffraction order, and this approach is also effective for multi-ring optical vortices. We upload this phase-diffractive optical element on the liquid crystal spatial light modulator to do the experiment. The observed far-field diffraction patterns fit well with the simulation results.
基金supported by the National Natural Science Foundation of China (No. 51305105)the China Postdoctoral Science Foundation (No. 2013M531024)the Fundamental Research Funds for the Central Universities (No. HIT. NSRIF. 2014008)
文摘A beam combination setup for a dual-frequency laser with orthogonal linear polarization is proposed. It consists of two polarizing beam splitters（PBSs） whose polarization axes are orthogonal to each other. A theoretical analysis demonstrates that a combined dual-frequency laser beam with this setup strictly meets orthogonal linear relation. The experimental results show that compared with the conventional setup, the ellipticity and nonorthogonality of the combined dual-frequency laser beam are significantly reduced.
