Coherent control practical applications

Despite the expectations raised with any new scheme for coherent control, their experimental realizations have so far (like the theoretical models) been widely limited to simple molecules or even atoms. Nevertheless, the feasibility of most schemes could be demonstrated in the laboratory. The picture that presents itself is therefore encouraging in principle even though for practical applications a lot of work remains to be done. It is the inten-... 

Selective excitation of wavepackets with ultrashort broadband laser pulses is of fundamental importance for a variety of processes, such as the coherent control of photochemical reactions [36-39] or isotope separation [40--42]. It can also be used to actively control the molecular dynamics in a dissipative environment if the excitation process is much faster than relaxation. For practical applications it is desirable to establish an efficient method that allows one to increase the target product yield by using short laser pulses of moderate intensity before relaxation occurs [38]. 

By applying an erasing pulse to destroy atomic spin coherence during light storage, the stored optical information can be erased in a controlled fashion. Erasing efficiency of about 85% is observed. This erasure of stored optical information may have practical applications in information processing and all-optical network.. 

In Chapter 1 we introduce the concept of SHE (safety, health and environment) information systems. It will provide a frame of reference in our subsequent analysis of the different tools and methods used in accident control through experience feedback. We make a comparison with the human information processes and identify basic similarities and differences. Chapter 2 gives an overview of different boundary conditions of a SHE information system, both inside and outside a company. Chapter 3 introduces four different approaches in safety practice and describes how these will contribute in subsequent parts of the book to our understanding of how to prevent accidents. In Chapter 4 we will look into a case from the environmental field. It demonstrates a successful application of basic principles of experience feedback in the reduction of emissions from a fertiliser plant. We use this example to present some of the issues dealt with in later parts of the book and demonstrate how they form a coherent whole. 

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