Yb:YAG laser system

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Silicon is the mainstay of our electronics, computing and communications technologies, and until recently it was only available as a mixture of the three stable isotopes: 28^Si, 29^Si and 30^Si. It is also the prototypical and most perfect semiconductor material, and as a result much of semiconductor physics and spectroscopy was developed and perfected using Si. The unexpected discovery by our group that the already very narrow linewidths of many of the optical transitions associated with impurities in Si were in fact limited by inhomogeneous isotope broadening in ordinary 'natural' Si, and that these transitions were more than ten times sharper in highly enriched 28^Si, quickly led to a number of surprising discoveries and potential new applications. In particular, the discovery that the tiny hyperfine splitting resulting from the coupling of the nuclear and electronic spins of the 31^P donor could be well resolved in the donor bound exciton transition in 28^Si has led to a number of potential applications in single atom detection, quantum computing and quantum information systems.