Abstract
The nature of Cr 3+ center in LiNbO 3 has been the subject of intense discussions in recent years. Partly, contradictory assignments of the centers resulted from intrinsic defects in the so-called congruent samples. More recently, stoichiometric samples, produced via the VTE process, have become available and show a largely reduced number of Cr sites. In this paper we present new spectroscopic data on a stoichiometric LiNbO 3 : Cr 3+ sample produced using the HTTSSG process. This sample shows an even further reduced number of lines in the so-called R-line region. In addition, the study of this sample sheds new light on the origin of near infrared emission lines first discovered in LiNbO 3 : Cr : Mg, which might be due to Cr 3+–Nb 4+ pairs. All emission lines show an unprecedented small line width, which allows high-resolution studies on this fascinating system.
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