| Summary: | 碩士 === 國立臺北科技大學 === 光電工程系所 === 93 === In this thesis, we discussed several issues regarding the designs of the 4-level phase-only diffractive optical elements (DOEs) using the simulated annealing (SA) method. The SA scheme adopted here was the fast simulated annealing. The concerned issues include the effects of the initial and freezing temperatures, the stable state, and the number of perturbations. The simulation results of 4-level DOEs that were designed using various temperatures and stable states were presented and analyzed. Moreover, we discuss the relationship between annealing parameters and convergent properties. In the currently-presented papers about DOEs designed using the SA method, researchers adopted a conventional SA scheme in which a single perturbation is conducted in each iteration. This results on a limited search in a local area of the solution space. In this study, we proposed a modified SA scheme in which multiple perturbations were conducted to relax the local search on the conventional method. According to the simulation results, the case of multiple perturbation effectively extended the limited search area in the solution space, which in turns increased the convergence speed.
|
|---|
