Abstract
Virtual excitations of semiconductors provide a powerful method for studying light-matter interaction. They are particularly attractive because no real particles are created which would modify the optical properties of the medium under study or induce long-lived effects. The ultrafast response produced by virtual excitations can also be used for optical switching devices with almost no heat dissipation.1 The generalization of these applications will rely on the development of picosecond laser diodes.
© 1989 Optical Society of America
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