Pulses with duration of Femtosecond presents a broad band spectral feature, which allows the formatting of their spectral components. Methods of pulses formatting are being used to control the interaction of light with matter in non-linear processes. Indeed, understanding how the characteristics of the pulse phase modulation affect the coherent control must allow a breakthrough in this area. However, this understanding becomes quite complex when the genetic-like algorithms are used to optimize a given process. Thus, in this project we intend to use the method of principal component analysis (PCA) to assist in the interpretation of results obtained using the genetic algorithm. We intend, for example, develop a methodology that uses PCA to identify only the most relevant aspects of phase masks, facilitating the understanding of the problem. With this methodology, we propose to study the coherent control of the emission excited via multiphoton absorption in zinc oxide (ZnO), an interesting material for the manufacture of optical and photonic devices. We also will investigate further optimization of the process of absorption of two photons in perylene derivatives, materials that have high cross-sections of nonlinear absorption. For these materials, we intend, through the analysis of the pulse obtained from the GA, with the aid of PCA, pointing out aspects of the process connected to coherent control characteristics of the compounds.
News published in Agência FAPESP Newsletter about the scholarship: