✍ Scribed by J.F.H. Nicholls; T.P.J. Han; B. Henderson; F. Jaqué
No coin nor oath required. For personal study only.
Spectroscopic studies are reported of Crs3+ : LiNbOs and of Cr3+-doped MgO-LiNbOa, with different C?+ doping levels. A knowledge of the defect structure of melt grown crystals enables an assignment of the R-line structure of C?+ ions to independent optical eentres involving Nb'+ and Li+ ion sites. Site-selective laser spectroscopy of Cr'+-doped LiNbO, confirms that charge compensation for Cr'+ ions occupying Li+ and Nb 5+ sites is not via exchange coupled nearest-neigbbour pairs of Cr'+(Li+ )-Cr'+ ( Nbs+ ) ions. The R lines observed using photoluminescence are shown to be inhomogeneously broadened by disorder.
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