Cole, J.M. and Clarke, S.J. and Wright, A.C. and Sinclair, R.N. and Newport, R.J. and Fisher, C.E. and Martin, R.A. and Cuello, G.J. and Fischer, H.E.
Structure Of Rare-Earth Phosphate Glass Studied By Anomalous Dispersion Neutron Diffraction.
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Rare-earth (R) phosphate glasses (R2O3)x.(P2O5)1-x where x=1/4 or 1/6 have shown great promise in the laser and optoelectronics industry. This is because the rare-earth ions possess the required energy levels for achieving successful population inversion and the non-linear refractive index is large enough to exhibit the desired optical effects without causing beam breakup and damage. Moreover, the particularly high concentrations of rare-earth ions present in these materials results in a myriad of exotic physical properties at low temperatures: negative thermal expansion, negative pressure dependence of bulk moduli and unprecedented magnetic, magneto-optical and opto-acoustic phenomena.
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