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The deformation of droplet plays a significant role in influencing focus range and image quality of liquid controllable optical devices. According to Laplace Equation, the shape model of droplet is established based on the electro-wetting effect on dielectric. In this paper, the influence of gravity on the droplet deformation is taken into account. Using numerical calculation methods, the shape of static droplet and the deformation of droplet when external voltage is applied are deduced theoretically. Deformations of droplet which are applied with different voltages are compared. Theoretical analysis shows that the focal length of droplet changes from67.2 mmto infinity as solid phase is planar. As the solid phase is conical surface, the zoom range of droplet is related to the cone angle, and the transition from the negative lens to the positive lens can be realized.
The theoretical analysis of the output of a diode face-pumped Nd:YVO4 slab laser structure with periodic gain is presented, with which in-phased locked output with highly spatially suppressed single-peak intensity distribution could be obtained. We demonstrate respectively that the intensity of the far field distribution with the filling factor of the periodic gain being 60%, 70%, 80%, 90% and obtain a suppressed far-field single peak with barely side-lobes. We discuss the difference of the far-field single-peak intensity distribution between the uniform periodic gain and non- uniform periodic gain, and get the result that the non-uniform periodic gain distribution makes the far-field single-peak rough and asymmetrical.