The advent of the laser in 1960 began a new era in optics, eventually leading to numerous technological innovations, from laser surgery to CD-ROMs. Laser light has a combination of high coherence and ...

This is a preview. Log in through your library . Abstract Motivated by several well-known examples of linear waves in uniform media, a general definition of a dispersionfree wave valid for both ...

For the classical wave equation the map from initial data to Friedlander?s radiation field is an isometry in energy spaces. I will explain the limitations of classical scattering theory, in the ...