Some Improvements To Genetic Algorithm And Its Application In Pulse Shaping

There is a rapid growth of research activity in the area of controlling quantum phenomena in recent years. Some applications used a laser field that calculated using molecular reaction dynamics. theories As for polyatomic molecule, it is very hard to get its potential energy surface theoreticallyThe availability of femtosecond laser pulse–shaping capabilities and the application of algorithms for closed-loop learning control directly in the laboratory provide an alternative way of selective cleavage and rearrangement of chemical bonds.This work gave a brief introduction to breeder genetic algorithm, which is good at high dimension optimization. Then we proposed some improvements of the traditional ones and implemented the improved algorithm in experimental closed-loop learning pulse shaping.1. Multiple cross-over operators were used to operate on the population together. Because of the cooperative effect, the fitness values from multiple cross-over operators were better than that from any individual operator. Hence a larger searching space was generated, which prevented the algorithm to converge to a local optimal solution.2. In order to achieve faster convergence, we proposed a new interpolation method, nonlinear interpolation, in which the interpolated number density depends on the intensity of laser spectrum.3. We proposed a new method of parameters self-adjustment.The improved algorithm was successively used in the optimization of the output spectrum phase from a femtosecond laser pulse shaping setup, and it was used in the experiments of coherent control of ionization and dissociation process of acetone molecule.